ATR 42-500 User manual

72-212A
42-500
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p. 1
Introduction
This Systems guide is an essential tool for all ATR flight crew and engineer to learn or
review ATR systems operation. To make learning process easier, systems are introduced
in a user-friendly and efficient training method, including diagram and schematic display as
appropriate.
This guide is a comprehensive document that efficiently complements FCOM 1st part
–Systems description. Systems are organized as per FCOM chapter, including their ATA
classification along with cockpit location. Cockpit panels familiarisation is presented with
each relevant system description in a separate annex.
This new guide release is intended for training on ATR 42-500 and 72-212A. It presents
a generic aircraft not customized to your own aircraft systems. Should you find any
discrepancy between Systems guide and your customized ATR operational documentation
(AFM, FCOM & QRH), the latter takes precedence.
NB: This Systems guide is also available for ATR 42-300 and 72-200 not PEC. This document will also
be developed for the ATR-600.
The Training and Flight Operations support team.

p. 2
Contents
Contents
Chapter A. Aircraft general
1. Doors location..........................................................................................................................................................................................................................................7
2. Cargo door panel..................................................................................................................................................................................................................................8
3. Doors panel..................................................................................................................................................................................................................................................8
4. External lights ...........................................................................................................................................................................................................................................9
5. EXT LT panel ...........................................................................................................................................................................................................................................10
6. Memo panel .............................................................................................................................................................................................................................................10
7. Signs panel................................................................................................................................................................................................................................................10
8. Internal lighting ...................................................................................................................................................................................................................................11
9. LT panel..........................................................................................................................................................................................................................................................12
10. ANN LT panel......................................................................................................................................................................................................................................12
11. Side panel................................................................................................................................................................................................................................................12
12. FLT COMPT LT panel................................................................................................................................................................................................................12
Chapter B. Multi Function Computer...............................................................................................................................13
Chapter C. Centralized Crew Alerting System
1. Cockpit philosophy........................................................................................................................................................................................................................16
2. CCAS description.............................................................................................................................................................................................................................17
3. Crew alerting panel .......................................................................................................................................................................................................................18
4. EMER audio cancel & TO Config test...................................................................................................................................................................19
5. Aural alarms.............................................................................................................................................................................................................................................20
Chapter D. Air
1. Pneumatic system...........................................................................................................................................................................................................................22
1.1. Schematic......................................................................................................................................................................................................................................22
1.2. AIR BLEED panel..................................................................................................................................................................................................................23
2. Air conditioning...................................................................................................................................................................................................................................24
2.1. Schematic......................................................................................................................................................................................................................................24
2.2. COMPT TEMP panel........................................................................................................................................................................................................25
3. Avionics ventilation........................................................................................................................................................................................................................26
3.1. Schematic......................................................................................................................................................................................................................................26
3.2. AVIONICS VENT panel ..................................................................................................................................................................................................26
4. Pressurization.......................................................................................................................................................................................................................................27
4.1. Schematic......................................................................................................................................................................................................................................27
4.2. Cabin pressure indicators .......................................................................................................................................................................................28
4.3. Auto-press panel..................................................................................................................................................................................................................28
4.4. MAN RATE Knob & Cabin press panel ...................................................................................................................................................28
Chapter E. Automatic Flight Control System
1. Schematic...................................................................................................................................................................................................................................................30
2. ADU .....................................................................................................................................................................................................................................................................31
3. AFCS control panel........................................................................................................................................................................................................................31
Chapter F. Communications
1. Schematic...................................................................................................................................................................................................................................................33
2. PTT selector & NOSE WHEEL STEERING CONTROL switch...............................................................................................33
3. Audio control panel.......................................................................................................................................................................................................................34
4. VHF.......................................................................................................................................................................................................................................................................34
5. AUDIO SEL pb.......................................................................................................................................................................................................................................34
6. Loudspeaker volume knobs..............................................................................................................................................................................................34
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Contents
7. TCAS control box.............................................................................................................................................................................................................................35
8. EMER LOC XMTR panel..........................................................................................................................................................................................................35
9. Cabin attendant handset........................................................................................................................................................................................................35
10. Handmike & handset................................................................................................................................................................................................................35
11. CALLS panel........................................................................................................................................................................................................................................35
12. Head set / Boom set / Hand mike panels....................................................................................................................................................36
13. ATC box......................................................................................................................................................................................................................................................36
14. CVR panel................................................................................................................................................................................................................................................36
15. Crew oxygen mask.....................................................................................................................................................................................................................36
Chapter G. Electrical Systems
1. Sources of power.............................................................................................................................................................................................................................38
2. DC-AC schematic............................................................................................................................................................................................................................40
2.1. Normal supply: On ground with battery only.................................................................................................................................40
2.2. Normal Supply: On ground with external power.......................................................................................................................41
2.3. Hotel mode or DC GEN 1 FAULT.....................................................................................................................................................................42
2.4. Normal supply: with two generator on line......................................................................................................................................43
2.5. Emergency supply: In dual DC GEN LOSS with the battery toggle switch on OVRD............44
2.6. Emergency supply: In dual DC GEN LOSS with the battery toggle switch on OVRD
and second OVRD selected ..................................................................................................................................................................................45
2.7. Emergency supply: In dual DC GEN LOSS with TRU .........................................................................................................46
3. DC-AC panel...........................................................................................................................................................................................................................................47
4. ACW schematic ..................................................................................................................................................................................................................................48
5. ACW panel .................................................................................................................................................................................................................................................49
6. Breakers panels .................................................................................................................................................................................................................................50
6.1. Overhead panel......................................................................................................................................................................................................................50
6.2. Electric rack behind F/O............................................................................................................................................................................................50
Chapter H. Emergency equipment
1. Emergency equipment situation..................................................................................................................................................................................52
2. Emergency lighting system................................................................................................................................................................................................52
3. First aid kit.................................................................................................................................................................................................................................................53
4. Crash axe ....................................................................................................................................................................................................................................................53
5. Megaphone...............................................................................................................................................................................................................................................53
6. Flashing light..........................................................................................................................................................................................................................................53
7. Life jacket ...................................................................................................................................................................................................................................................53
8. Escape rope.............................................................................................................................................................................................................................................53
9. Gloves ..............................................................................................................................................................................................................................................................54
10. Water extinguisher......................................................................................................................................................................................................................54
11. Halon extinguisher......................................................................................................................................................................................................................54
12. Oxygen schematic.......................................................................................................................................................................................................................54
13. Oxygen panel......................................................................................................................................................................................................................................55
14. Cockpit crew oxygen mask............................................................................................................................................................................................55
15. Portable oxygen bottle..........................................................................................................................................................................................................55
16. Passenger oxygen mask.....................................................................................................................................................................................................55
17. Protective breathing equipment...............................................................................................................................................................................55
Chapter I. Fire protection
1. Schematic...................................................................................................................................................................................................................................................57
2. Avionics FWD & AFT detection......................................................................................................................................................................................57
3. Fire handle.................................................................................................................................................................................................................................................58
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Contents
Contents
4. Compartment smoke panel................................................................................................................................................................................................58
5. Condition levers fuel light.....................................................................................................................................................................................................58
Chapter J. Flight control
1. Roll schematic......................................................................................................................................................................................................................................60
2. Pitch schematic..................................................................................................................................................................................................................................60
3. Yaw schematic.....................................................................................................................................................................................................................................61
4. Gust lock......................................................................................................................................................................................................................................................61
5. Stick Shaker/Stick Pusher push button and light................................................................................................................................61
6. Spoilers position indicator...................................................................................................................................................................................................62
7. Pitch trim asym light....................................................................................................................................................................................................................62
8. Trim position indicator ..............................................................................................................................................................................................................62
9. Trim controls...........................................................................................................................................................................................................................................62
10. Flaps schematic .............................................................................................................................................................................................................................63
11. Flaps position indicator........................................................................................................................................................................................................63
12. Flaps control lever.......................................................................................................................................................................................................................63
Chapter K. Flight instruments
1. Schematic...................................................................................................................................................................................................................................................65
2. EADI....................................................................................................................................................................................................................................................................66
3. EHSI....................................................................................................................................................................................................................................................................66
4. EHSI with composite mode................................................................................................................................................................................................67
5. EHSI - ARC MODE with terrain or weather radar information...........................................................................................67
6. Source failure alert.........................................................................................................................................................................................................................67
7. Sources switching panel........................................................................................................................................................................................................68
8. EFIS control panel...........................................................................................................................................................................................................................68
9. Weather radar control................................................................................................................................................................................................................69
9.1. Primus 800 ....................................................................................................................................................................................................................................69
9.2. Primus 660 ....................................................................................................................................................................................................................................69
10. AHRS erect PB .................................................................................................................................................................................................................................69
11. TAT/SAT indicator.........................................................................................................................................................................................................................70
12. Clock..............................................................................................................................................................................................................................................................70
13. RCDR panel..........................................................................................................................................................................................................................................70
14. STBY instruments........................................................................................................................................................................................................................70
15. Airspeed indicator .......................................................................................................................................................................................................................71
16. Altimeter....................................................................................................................................................................................................................................................71
17. RMI ...................................................................................................................................................................................................................................................................71
18. Flight data entry panel...........................................................................................................................................................................................................72
19. TCAS vertical speed indicator ....................................................................................................................................................................................72
Chapter L. Fuel system
1. Schematic...................................................................................................................................................................................................................................................74
2. Starting procedure..........................................................................................................................................................................................................................75
3. Normal procedure............................................................................................................................................................................................................................76
4. Crossfeed procedure ..................................................................................................................................................................................................................77
5. Engine feed jet pump low pressure.........................................................................................................................................................................78
6. Low level ......................................................................................................................................................................................................................................................79
7. Engine fire procedure.................................................................................................................................................................................................................80
8. Fuel panel....................................................................................................................................................................................................................................................81
9. Fuel QTY panel.....................................................................................................................................................................................................................................81
10. XFEED advisory light................................................................................................................................................................................................................81
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Contents
Chapter M. Hydraulic
1. Schematic...................................................................................................................................................................................................................................................83
2. HYD PWR panel..................................................................................................................................................................................................................................83
3. Pressure indicator...........................................................................................................................................................................................................................83
4. AUX pump pedestal switch................................................................................................................................................................................................83
Chapter N. Ice and rain protection
1. Schematic...................................................................................................................................................................................................................................................86
2. Probes and windshield HTG..............................................................................................................................................................................................87
3. Rain protection....................................................................................................................................................................................................................................87
4. Ice detector & icing AOA........................................................................................................................................................................................................87
5. De-icing schematic........................................................................................................................................................................................................................88
6. Anti-icing & de-icing panel..................................................................................................................................................................................................90
7. De-icing (memo panel)..............................................................................................................................................................................................................90
Chapter O. Landing gear
1. Landing gear description ......................................................................................................................................................................................................92
2. Brakes schematic............................................................................................................................................................................................................................92
3. LDG GEAR position indicators.......................................................................................................................................................................................93
4. Landing gear handles.................................................................................................................................................................................................................93
5. Brakes temperature and antiskid...............................................................................................................................................................................93
6. Emergency parking brake handle..............................................................................................................................................................................93
7. Steering handwheel......................................................................................................................................................................................................................93
Chapter P. Navigation system
1. Nav control box...................................................................................................................................................................................................................................95
2. Marker switch .......................................................................................................................................................................................................................................95
3. ADF control box..................................................................................................................................................................................................................................95
4. EGPWS alert modes.....................................................................................................................................................................................................................95
5. EGPWS pb..................................................................................................................................................................................................................................................99
6. EGPWS selector.................................................................................................................................................................................................................................99
7. Global navigation satellite system (GNSS)................................................................................................................................................100
Chapter Q. Power plant
1. Engine schematic ........................................................................................................................................................................................................................102
2. Power and propeller controls......................................................................................................................................................................................103
3. Engine indicators..........................................................................................................................................................................................................................106
4. ENG START panel ........................................................................................................................................................................................................................107
5. ENG control panel.......................................................................................................................................................................................................................107
6. PWR MGT panel.............................................................................................................................................................................................................................108
7. ATPCS test panel..........................................................................................................................................................................................................................108
8. Idle gate..................................................................................................................................................................................................................................................... 108
Annexes
Annex 1. Cockpit panels............................................................................................................................................................................................................110
Annex 2. Abbreviations................................................................................................................................................................................................................123
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A - Aircraft general p. 6 A - Aircraft
g
eneral p.
6
A. Aircraft general
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p. 7
Contents
1. Doors location ATA 52
Pilot communication
hatch
Rear entry door /
emergency exit type I
Cargo door
Aft avionics
compartment door
Emergency exit
type III
Service door /
emergency exit type I
Pilot emergency hatch
Forward avionics
access hatch
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A - Aircraft general p. 8
A. Aircraft general
ARMED light
– Selector armed green light is ON,
when actuator selection switch
working conditions are met:
– cover panel opened
– door unlocked by operating handle:
all hooks are disengaged and FWD
latchlock is unfastened
GND HDL light
Ground handling bus ON BAT red light
is On when ground handling bus is
directly supplied by HOT main bat
bus: means that the battery is dis-
charging even if the BAT toggle switch
is in OFF position (visible even when
the cover panel is closed)
This red light is ON when:
– The refueling panel is open
– The cargo door control panel is
open
– The passenger door is open
and alert, that the battery is discharging
before leaving the aircraft
LCHD light
blue light is ON when all door hooks
and latch locks are fully engaged
CARGO LIGHT switch
allows activation of the cargo
bay light from outside
Panel cover switch
connects the ground handling bus on
line when the panel cover is opened
and allows operation of cargo door.
During the opening, a self test of the
MFC 1A and 2A is performed to initiate
the control system of the cargo door.
Actuator selection switch
is used to operate the door (OPEN
or CLOSE) when the CARGO
DOOR ARMED green light is on
2. Cargo door panel ATA 52
3. Doors panel ATA 33
DOORS lights
CABIN and CARGO aural alarms are
inhibited when the Condition Lever 1
is on FTR or FUEL SO
SVCE and FWD COMPT aural alarms
are inhibited when the Condition Lever
2 is on FTR or FUEL SO
CAB OK and SVCE OK
Light on when SW TEST depressed
and check microswitches operation
SW TEST
Tests continuity of microswitch system
(on ground, doors opened)
UNLK
At least 1 micro switch is opened

A - Aircraft general p. 9
A - Navigation lights
B - Taxi and T/O lights
C - Landing lights
D - Wing lights
E - Beacon lights
F - Strobe lights
G - Logo lights
H - Emergency light
4. External lights ATA 33
Memo panel
Cabin panel
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A - Aircraft general p. 10
A. Aircraft general
BEACON and NAV
supplied by SVCE BUS and BUS 1
LOGO
supplied by SVCE BUS
WING
Supplied by DC BUS 2
ARM
Emergency lights illuminate
when <18 V on STBY bus
or if both DC GEN off line.
Emergency lights extinguish
when >20V on STBY bus and
at least 1 GEN operating
NO SMKG and SEAT
BELTS
Blues Lts on MEMO panel
when ON. (DC BUS 2)
DISARM
system deactivated
STROBE, LAND
supplied by ACW BUS 1
(Left Hand), ACW BUS 2
(Right Hand)
ON
emergency exit lights illuminates.
Supply: DC STBY or 6 V BAT packs
SEAT BELTS
illuminates blue when associated
switch is selected ON
NO SMKG
illuminates blue when associated
switch is selected ON
5. EXT LT panel ATA 33
6. MEMO panel ATA 33
7. Signs panel ATA 33
TAXI & T.O
Supplied by ACW BUS 2

A - Aircraft general p. 11
8. Internal lighting ATA 33
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A - Aircraft general p. 12
A. Aircraft general
INST
Selects activation and intensity
of main panel instrument integral
lighting
DSPL knob
selects activation and intensity of
all digit lighting
CAPT CONSOLE LT knob
selects activation and intensity of
the respective lateral console
DOME switch
BR T: dome lights are supplied
with maximum intensity
DIM: dome lights are dimmed
OFF: both dome are off
DOME light: the F/O dome light
becomes BRT when the switch in
BRT or DIM if:
– dual DC GEN loss
– or on ground, with BAT supply
only
STORM switch
On position, flood lights are ON with
maximum intensity and fluorescent
tubes are ON
STBY COMPASS switch
to illuminate the STBY COMPASS
ON and OFF position
CAPT READING LT knob
selects activation and intensity
of the respective spot light
To check and control the intensity of:
– the annunciator lights on the overhead
and pedestal panels
– the overhead panel flow bars
TEST: All the associated lights come
on bright
BRT: associated light illuminate bright
DIM: associated light are dimmed
PNL rotary selector
selects activation and intensity of
glareshield, pedestal and overhead
panels instrument integral lighting
FLOOD knob
selects activation and intensity of pedestal
panel flood lighting. (OFF TO BRT)
9. LT panel ATA 33
10. ANN LT panel ATA 33
11. Side panel ATA 33
12. FLT COMPT LT panel ATA 33

B - Multi Function Computer p. 13
B. Multi Function Computer
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B - Multi Function Computer p. 14
B. Multi Function Computer
FAULT
illuminates and the CCAS is activated
when a malfunction or electrical
supply fault is detected. The module
automatically becomes inoperative.
This light also flashes during self-test
of the module.
During powering, since all 4 modules
are selected ON, the following
sequence is executed:
MFC 1A and MFC 2A FAULT lights
flashing (self-test of these modules)
MFC 1A and MFC 2A FAULT lights
extinguish.
MFC 1B and MFC 2B FAULT lights
flashing (self-test of these modules)
MFC 1B and MFC 2B FAULT lights
extinguish
NOTE: Here, if the cargo door control
panel is opened, the self test of MFC
1A and 2A are already done, and only
the MFC 1B and 2B are tested.(See
chapter A.2)
OFF
The module stops operating
Numerous logic funtions are performed by two independant computers (MFC1 and MFC2).
Each computer includes two independant modules (A and B)
The purpose of these computers is to:
–monitor, control, authorise operation of the aircraft systems
–manage system failures and flight enveloppe anomalies and command triggering of associated warning
The MFC functions can be treated: –in one module only
–in several modules (redundancy)
–partially in 2 modules
Example:
SYSTEM FUNCTION
MODULE
1A 1B 2A 2B
FLIGHT STICK PUSHER 
CONTROLS STALL WARNING zz
– The stick pusher function is integrated in modules 1A, 1B, 2A and 2B.
–The stall warning function is integrated in modules 1B and 2B.
–The stick pusher function is available if modules (1A AND 2A) OR (1A AND 2B)
OR (1B AND 2A) OR (1B AND 2B) operate. This function is therefore not available
if modules (1A AND 1B) OR (2A AND 2B) are lost.
–The stall warning is available if modules 1B OR 2B operate.
This function is therefore not available if modules 1B AND 2B are lost.

C - Centralized crew alerting system p. 15
C. Centralized crew
alerting system
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C - Centralized crew alerting system p. 16
C. Centralized crew alerting system
1. Cockpit philosophy ATA 31
In normal operation, all the lights are extinguished (Dark cockpit philosophy). With few exceptions, the lights illuminate to
indicate a failure or an abnormal condition.
Normal operation
Warning indication
Caution indication
Other than normal basic operation
Temporarily required system in normal operation
Back up or alternate system selected

C - Centralized crew alerting system p. 17
2. CCAS description ATA 3 1
The CCAS draws crew’s attention when a failure is detected and guides the crew to the system affected by the failure
Three types of visual devices are used: –MASTER WARNING and MASTER CAUTION lights
– CREW ALERTING PANEL (CAP) lights
– LOCAL ALERT lights
Detection sequence
INFORMATION IDENTIFICATION ISOLATION
Example: ACW Generator 1 failure
MASTER
CAUTION light
flashing
+ Single Chime
ELEC light on the CAP Local alert: fault light on the
ACW gen 1 push-button

C - Centralized crew alerting system p. 18
C. Centralized crew alerting system
CONFIG
T/O config test or PL’s at T/O
with:
–PWR MGT not at T/O
–flaps not at 15 °
–trim out of green sector
–TLU LO SPEED green light
not illuminated
–AIL LOCK light illuminated
–Parking brake handle not fully
released (PLs only)
FWD SMK
Forward cargo smoke
FLAPS UNLOCK
spurious Flaps retraction more
than 3° (42-500), 4° (72-212A)
when flaps extended
HYD
Either tank < 2.5 l
Either pump drain > 121°
Either pump < 1500 PSI and
good conditions to run
DOORS
Any door not seen locked
LDG GEAR NOT DOWN
Any gear not seen down and locked
and:
1. flaps 25° or flaps 30°, ZRA < 500 ft
and PL at low power
2. at least one PL at FI and ZRA < 500 ft
(inhibited until 2.5 min after gear up)
AUDIO
RCAU failure or power loss
IDLE GATE
Automatic idle gate system
failure
PRKG BRK
Parking brake not fully released
RCL
When pressed: all inhibited or
cancelled caution lights will
illuminate (recall) if the respective
system is still degraded or manual
cancellation of T/O INHI
CLR
When pressed, all amber lights are
cleared, except PRK BRK, GPWS
and MAINT PNL
PITCH DISCONNECT
Elevator uncoupling
PROP BRK
Prop brake not locked in full
locked or in full released
position
LOOP
engine fire loop fault
ANTI ICING
Loss of heating: windshield,
horns, prop, static probes (on
GND only), Pitot probes, Alpha
probes and TAT probes (In flight
only)
Common air mainfold < 14
PSI, distribution valves fault,
ice detector fault, inflation
sequence not correct, air temp
> 230°, Mode sel auto fault,
APM fault
WHEELS
Anti-skid failure or brake temp
> 160° (42-500)
> 150° (72-212A)
GPWS FAULT
GPWS computer fault or power
loss
3. Crew alerting panel ATA 31
T.O. INHI
When pressed: eng oil, smoke lights,
all caution lights are inhibited (except
PRKG BRK, GPWS FAULT, MAINT
PNL, EFIS COMP, FLT CTL and
ENG.

C - Centralized crew alerting system p. 19
ENG
– PWR (MGT) not at T/O during
T/O or config test
– ITT more than 800°C (715° in
hotel mode)
– EEC / PEC failure
– Gust lock not engaged,
propeller brake ON and ENG
start selector on start (engine
2 only)
– Incorrect ADC switching
– Start light ON past 45% NH,
Low pitch in flight, HP pump
fuel filter pressure > 25 Psi
– GCU failure during start
AIR
– Bleed valve disagreement with
selected position
– Bleed DUCT temp > 274°c
– Leak detected with a loop
temp > 153 ± 8°C
– Pack valve disagreement
– Overheat downstream of compressor
with temp > 204°C
– Overpressure > 80 PSI
– Overtemperature in air conditioning
DUCT with temp > 92°C
– Fan (extract or recirculating) failure
–OVBD valve position disagreement
– X VALVE disagreement
– AUTO press FAULT
– Both OUTFLOW valves in DITCH
position
– AFT COMPT/LAV fan failure
MAINT PNL
Maint panel rotary sel on either
panel not in normal position
ENG 2 OIL
Oil pressure < 40 PSI (inhibited 30
sec during engine start)
OXY
Low press system < 50 PSI
ELEC
Any DC or AC power failure
FLT CTL
– During T/O or T/O config test pitch
trim out of green sector or flaps not
at 15°, AIL LOCK actuators not fully
retracted, disagreement between Ail
lock acts and Gust lock lever
– Flaps asymmetry > 6.7°
– TLU fault
– Stick pusher or stick shaker fault or
pitch trim asym
– AIL LOCK
EFIS COMP
AHRS or LOC/GS disagreement
FUEL
Engine feed low press <4 psi
or tank low levels
AFT SMK
After cargo or lavatory smoke
NAC OVHT
RH NAC OVHT >170°C
EXCESS CAB ALT
Cabin altitude > 10000 ft
ENG 1 / 2 F IRE
Engine fire
EMER AUDIO CANCEL
Guarded switch, cancel the aural
specific of an undue continuous
aural except for landing gear,
VMO, VFE, VLE, stall warning,
pitch trim whooler, landing gear,
AP disconnection
TO CONFIG TEST
– To check T/O configuration (PWR
MGT in T/O+ TLU LO SPD illuminated
+ pitch trim in green sector+flaps 15° +
ail lock light extinguished) by simulating
power levers at T/O position, except
PARK BRAKE
– To perform an automatic RECALL
4. EMER audio cancel & TO
config test ATA 31
MFC
Any MFC module faulty or
electrical supply loss
ENG 1 OIL
Oil press < 40 Psi (inhibited
30 sec during engine start)
ELEC SMOKE
Avionics smoke
EXCESS CAB ΔP
Cabin press diff > 6.35 Psi