ATR 42-500 User manual

72-212A
42-500
09T2253_ATRcouvDEF_SYSTEM42_72.indd COUV1 19/05/10 11:03

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
09T2253_ATR_systems42_72PEC_AtoH.indd 2 19/05/10 11:04

p. 3
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
09T2253_ATR_systems42_72PEC_AtoH.indd 3 19/05/10 11:04

p. 4
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
09T2253_ATR_systems42_72PEC_AtoH.indd 4 19/05/10 11:04

p. 5
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
09T2253_ATR_systems42_72PEC_AtoH.indd 5 19/05/10 11:04

A - Aircraft general p. 6 A - Aircraft
g
eneral p.
6
A. Aircraft general
FCOM 1.00
09T2253_ATR_systems42_72PEC_AtoH.indd 6 19/05/10 11:04

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
09T2253_ATR_systems42_72PEC_AtoH.indd 7 19/05/10 11:04

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
09T2253_ATR_systems42_72PEC_AtoH.indd 9 19/05/10 11:04