Narco Avionics NAV122D User manual

NARCO AVIONICS
NAV122D, NAV122D/GPS
TSO’d NAVIGATION
SYSTEM
Installation Manual
03128-0620
NARCO AVIONICS INC.
270 COMMERCE DR , STE 200., FORT WASHINGTON PA 19034 (215)-643-2900 FAX [phone]
www.narcoavionics.com
COPYRIGHT, NARCO AVIONICS INC., 2007
PRINTED IN USA MARCH 2007 Rev 1.2

TABLE OF CONTENTS
SECTION TOPIC PAGE
NUMBER NUMBER
1. INTRODUCTION 1-1
1.1 GENERAL 1-1
1.1.1 Manual Organization 1-1
1.2 PRODUCT DESCRIPTION 1-1
1.3 DESIGN FEATURES 1-2
1.4 PRODUCT SPECIFICATIONS 1-2
1.5 UNITS AND ACCESSORIES SUPPLIED 1-5
1.6 OPTIONAL ACCESSORIES 1-6
1.6.1 Miscellaneous Items NOT Supplied 1-6
1.7 OPERATOR LICENSE REQUIREMENT 1-6
1.8 OPERATION 1-7
LIST OF TABLES
TABLE TITLE PAGE
NUMBER NUMBER
1.1 NAV SYSTEM CHARACTERISTICS 1-1
1.2 GENERAL SPECIFICATIONS 1-2
1.3 VOR/LOC RECEIVER 1-3
1.4 GLIDE SLOPE 1-3
1.5 EXTERNAL INDICATOR AND AUTOPILOT LOADS 1-4
1.6 INDICATOR IMPEDANCE AND DEFLECTION 1-4
1.7 UNITS AND ACCESSORIES SUPPLIED 1-5
1.8 INSTALLATION KIT PARTS LIST 1-6
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THIS PAGE INTENTIONALLY LEFT BLANK

INTRODUCTION
SECTION 1
1. INTRODUCTION
1.1 GENERAL
In support of the NARCO Avionics NAV122D, NAV122D/GPS navigation systems, this manual provides
detailed installation procedures.
“This manual is intended for use only by persons who are qualified to service the equipment described in
this manual pursuant to current regulatory requirements.”
1.1.1 Manual Organization
Organized into two major sections, the manual provides the following:
Section 1 Introduction -general information required in planning the installation.
Section 2 Installation -detailed procedures for performing the mechanical and electrical
installation.
1.2 PRODUCTION DESCRIPTION
Functions of the system covered within this manual are shown in Table 1.1.
TABLE 1.1 NAV SYSTEM CHARACTERISTICS
FUNCTION \ NAV SYSTEM NAV122D NAV122D/
GPS
NAV122D/
GPS
UNIT PART NUMBER 03128-0300 03128-0301 03128-0302
VOR/LOC Receiver X X X
Glide Slope Receiver X X X
VOR/LOC and GS Converters X X X
VOR/LOC and GS Displays X X X
ARINC 2/5 Channeling X X X
GPS Interface (L/R, T/F, Nav Flag, SIN/COS) - - X
GPS Interface (L/R, T/F, Nav Flag, Resolver) - X -
1-1

NARCO AVIONICS NAV122D, NAV122D/GPS
1.3 DESIGN FEATURES
Multiple functions to simplify installation.
ARINC Panel cutout, 3” instrument hole.
Direct replacement of existing NAV122 (minus marker RCVR)
Easily replaces NAV111/NAV112 receivers (cable modification required)
The NAV122D/GPS can be used as the external CDI display required in a IFR certified GPS installation
Meets the following TSO’s:
C-40c VOR TSO
C-36e Localizer TSO
C-34e Glide Slope TSO
1.4 PRODUCT SPECIFICATIONS
TABLE 1.2 GENERAL SPECIFICATIONS
GENERAL NAV122D
Mechanical
Physical Dimensions Figure 2-3
Weight NAV122D 2.5 Lbs.
Weight NAV122D/GPS 2.6 Lbs.
Electrical
Supply Voltage (see note 1) 13.75VDC
Current, less pilot lamps, 14V 350mA
Current, less pilot lamps, 28V (see note 2) 400mA
Pilot lamp current 14V 250mA
28V 250mA
Notes: 1. Voltage Converter required for 28VDC installations.
2. With MP 10, 28 to 14Vdc Voltage Converter - 0.60 Ampere.
1-2

INTRODUCTION
SECTION 1
1.4 Continued
TABLE 1.3 VOR/LOC RECEIVER
VOR/LOC RECEIVER NAV122D
Frequency Range (in MHz) 108.00 to 117.95
200 channels
Sensitivity (6dB S + N/N) 2.0µV
(Full VOR Flag) 2.0µV
Spurious and Image Rejection 80dB min
Selectivity 6dB ±19kHz
60dB ±42kHz
AGC Flatness (10µV to 10kµV) 1.0dB max
Audio Output (500ohm load) 50mW
VOR Accuracy 2.7°
LOC Accuracy ±5µa
DME Channeling Code ARINC 2 out of 5
TABLE 1.4 GLIDE SLOPE RECEIVER
GLIDE SLOPE RECEIVER NAV122D
Frequency Range (in MHz) 329.150 to 335.00
Sensitivity (Full GS Flag) 20µV
Spurious and Image Rejection 60dB
Selectivity 6dB ±19kHz
60dB ±42kHz
AGC Flatness (20µV to 10kµV) 3dB
GS Accuracy ±5µa
1-3

NARCO AVIONICS NAV122D, NAV122D/GPS
1.4 Continued
TABLE 1.5 EXTERNAL INDICATOR AND AUTOPILOT LOADS
AUTOPILOT INDICATOR NAV122D
NAV122D/GPS
Loading
VOR-LOC: Left-Right one, 1k ohm load
To-From Flag one, 1k ohm load
GS: Up-Down one, 1k ohm load
Warning Flag one, 1k ohm load
Output
VOR-LOC: Left-Right LOC 90mV for .093
ddm *
VOR 150mV for 10°
course change
To-From Flag 250mV
GS: Up-Down 78mV for .091
ddm *
Warning Flag 250mV
* ddm- Difference in depth of modulation
TABLE 1.6 INDICATOR IMPEDANCE AND DEFLECTION CHARACTERISTICS
MOVEMENT IMPEDANCE DEFLECTION
CHARACTERISTIC
LEFT/RIGHT 1000 OHMS 150mV full scale
TO/FROM 200 OHMS 250mV full scale
UP/DOWN 1000 OHMS 150mV full scale
GS FLAG 1000 OHMS 250mV full scale
ENVIRONMENTAL
The NAV122D and NAV122D/GPS are designed and tested to meet the appropriate categories of RTCA
DO-160C. The environmental qualification form can be found in appendix A
Operating temperature -20°C to +55°C
1-4

INTRODUCTION
SECTION 1
1.4.1 Explanation
The NAV122D and NAV122D/GPS are designed to be instrument panel mounted within the cabin
environment of fixed and rotary wing aircraft using piston or turbine engines, in single and multiengine
configurations. It is designed for non-pressurized aircraft operating up to 35,000 feet as well as for
pressurized aircraft. This equipment requires direct current, but may be installed in aircraft having
additional on-board alternating current sources.
1.5 UNITS AND ACCESSORIES SUPPLIED
The following listings may be used to: 1.) check the contents of your order
2.) to order additional Units or components.
Table 1.7 is used for ordering Units, refer to the Units Part Number and its Description.
Additional Installation Kits or detail parts of a Kit may be ordered from the Installation Kit Parts List. Item
Part Numbers are provided for service replacement purposes and are not used when ordering a complete
Installation Kit.
Table 1.8 Lists the contents of the installation kits which can be used for ordering parts for a bench test
harness.
Refer to Section 1.6, Optional Accessories, for additional items to complete the avionics system.
TABLE 1.7 UNITS AND ACCESSORIES SUPPLIED
UNIT PART
NUMBER
UNIT AND DESCRIPTION* SUPPLIED
WITH
INSTALLATION
KIT PART
NUMBER
01535-0101 NAV122D VOR, LOC/GS 03128-0500
01535-0102 NAV122D/GPS VOR, LOC/GS, (GPS Interface) 03128-0501
01535-0103 NAV122D/GPS VOR, LOC/GS, (GPS Interface, no resolver) 03128-0502
*NAV’s are 14V only. Refer to Section 1.6 for 28Vdc to 14Vdc Voltage Converter.
1-5

NARCO AVIONICS NAV122D, NAV122D/GPS
TABLE 1.8 INSTALLATION KIT PARTS LIST
ITEM PART
NUMBER DESCRIPTION QUANTITY
03128
0500 0501 0502
1 41364-0008 Connector, J810, 37 Pin 1 1 1
2 41307-0008 Hood, J810, Right Angle 1 1 1
3 41308-0004 Locking Assembly, J810 1 1 1
4 41152-0003 Connector, BNC 2 2 2
5 41372-0004 Contacts, Socket, Qty. 37 1 1 1
6 41444-0002 Connector, circular, J811 - 1 1
7 41445-0002 Contacts, J811 - 28 12
8 41446-0001 Cable clamp - 1 1
9 41444-0102 Jumper Plug Assembly * - 1 -
* Included with and to be used with Chassis level BACBCED and later only.
1.6 OPTIONAL ACCESSORIES
a) Power Converter...required only for 28V installations:
Narco Voltage Converter
MP 10 Voltage Converter, P/N 03710-0500, or equivalent.
b) Headphones - low impedance type, 300 to 1000ohms.
c) Audio Control Panel - NARCO CP 136M.
d) Circuit Breaker - Supplied by installing agency.
e) Straight, J810, Connector Hood - Order part number – 41307-0004.
f) Annunciator/Relay panel as required by the GPS / Annunciator
panel manufacturer (NAV122D/GPS only)
1.6.1 Miscellaneous Items NOT Supplied
a) Number 24 AWG stranded wire, as required.
b) Number 20 AWG stranded wire, as required.
c) Coaxial cable RG 58 C/U, as required.
d) Mounting hardware; refer to Section 2.
1.7 OPERATION LICENSE REQUIREMENT
There are no operator license requirements for this type of equipment.
1-6

INTRODUCTION
SECTION 1
1.8 OPERATION
Rotating the Volume Control/Ident clockwise, past the “click”, applies power to the NAV circuits;
continued clockwise rotation increases audio volume. Pulling this knob allows the 1020Hz Ident code to
be heard.
Receive Frequency Channeling
Receive frequency is selected by the concentric knobs at the Units lower right corner. Whole megahertz
frequencies are selected by the large knob while fractional megahertz frequencies are selected by the small
knob. Clockwise rotation of either knob increases selected frequency. Continuous tuning is permitted with
both knobs.
Omni Bearing Selection
A desired omni bearing is obtained by turning the OBS knob to set that bearing, shown on the Omni
Bearing Card, under the yellow Selected Bearing Indicator.
VOR/LOC Deviation Indicator
In VOR mode, the vertically oriented Indicator moves left or right to indicate location of selected VOR
bearing relative to actual aircraft heading. When centered, the Indicator shows on-course condition.
In Loc mode, the Indicator moves left or right to locate the center of the horizontal component of a ILS
glide path relative to actual aircraft heading.
GS Deviation Indicator
The Horizontal Deviation Indicator moves up or down to locate the center of the vertical component of an
ILS glide path relative to actual aircraft position. Acquisition of the ILS glide path will be shown when the
GS and LOC Deviation Indicators cross and center within the circle.
1-7

NARCO AVIONICS NAV122D, NAV122D/GPS
Warning Flags
TO-FROM Flag - Red NAV Flag alerts the pilot to either loss of signal or inadequate signal level. A TO
or FROM Flag shows whether the selected course will take the aircraft TO or FROM the station.
GS Flag - Red GS Flag alerts the pilot to either loss of signal or inadequate signal level.
NAV122D/GPS ADDITIONAL FUNCTIONS
When the NAV122D/GPS is being used as the CDI for an IFR certified GPS and the appropriate
GPS mode pin on P811 is active (frequency display now showing ‘GPS’), the following operations apply:
Frequency Recall
Pressing on the OBS knob will momentarily display the current NAV frequency. Additionally turning the
channeling knobs will cause the NAV frequency to be changed and the new frequency to be displayed for
2 seconds before ‘GPS’ returns to the display.
Left/Right deviation indicator, To/From indicator
When installed properly the Left/Right information and the To/From information presented when ‘GPS’ is
in the frequency window will be the information generated by the GPS receiver.
1-8

TABLE OF CONTENTS
SECTION TOPIC PAGE
NUMBER NUMBER
2.1 INTRODUCTION 2-1
2.2 PRELIMINARY PROCEDURES 2-1
2.2.1 Preliminary inspection 2-1
2.2.2 Pre Installation Bench Test 2-1
2.2.2.1 Test Equipment Required 2-1
2.2.2.2 Bench Test Wiring Harness 2-2
2.2.2.3 Test Procedure 2-3
2.3 MECHANICAL INSTALLATION 2-7
2.4 ELECTRICAL INSTALLATION 2-10
2.4.1 Antenna Connections 2-13
2.4.2 Interconnect Cable (P810) 2-13
2.4.2.1 Power Input Wiring 2-16
2.4.2.2 Audio Interconnections 2-16
2.4.2.3 DME and LOC/GS Activate 2-16
2.4.2.4 Dual Channeling 2-16
2.4.2.5 Autopilot and Additional Indicator Loads 2-17
2.4.2.6 Dimmer Control Adjustment 2-17
2.4.2.7 External Meter Functions 2-18
2.4.2.8 Arinc Resolver Connections 2-18
2.4.2.9 Display GPS Mode 2-18
2.5 POST INSTALLATION TESTS 2-22
2.5.1 Pre Flight Tests 2-23
2.5.2 Flight Test 2-24
2.6 AIRCRAFT LICENSE REQUIREMENTS 2-25
APPENDIX
A.1 Environmental Qualifications A-1
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NARCO AVIONICS NAV122D, NAV122D/GPS
LIST OF ILLUSTRATIONS
FIGURE TITLE PAGE
NUMBER NUMBER
2-1 BENCH TEST HARNESS 2-2
2-2 NAV122D/GPS Additional Bench Harness 2-3
2-3 MECHANICAL INSTALLATION 2-7
2-4 MOUNTING TEMPLATE, REAR MOUNT 2-8
2-5 MOUNTING TEMPLATE, FRONT REMOVAL FOR USE
WITH MARMAN CLAMP 2-9
2-6 BNC CABLE CONNECTOR 2-13
2-7 P810 ASSEMBLY 2-14
2-8 POWER INPUT CONNECTIONS 2-15
2-9 JP802 LOCATION 2-17
2-10A NAV122D/GPS CONNECTIONS 2-19
2-10B NAV122D/GPS CONNECTIONS 2-20
2-10C NAV122D/GPS CONNECTIONS (Chas. BACBCED and later) 2-21
LIST OF TABLES
TABLE TITLE PAGE
NUMBER NUMBER
2.1 DME 2-Out-Of-5 CHANNEL CODE 2-6
2.2 NAV122D REAR PANEL CONNECTIONS 2-10
2.3 NAV122D/GPS P811 CONNECTIONS 2-11
2.3A NAV122D/GPS P811 CON. (chassis BACBCED and later) 2-12
2.4 AUTOPILOT OUTPUT CHARACTERISTICS 2-17
2.5 GENERAL SPECIFICATIONS 2-25
2-ii

INSTALLATION
SECTION 2
2.1 INTRODUCTION
This section provides all the electrical and mechanical installation information. Electrical Installation and
Mechanical Installation Sections are independent and self-supporting. This permits their removal from the
manual allowing the electrical and mechanical installation efforts to proceed in parallel.
Interconnect cables are to be constructed by the installing agency. Refer to Section 2.4 for details.
2.2 PRELIMINARY PROCEDURES
2.2.1 Preliminary Inspection
Carefully unpack the equipment noting any damage to shipping cartons or avionics. If damage is noted,
retain the carton to corroborate damage claims.
Inventory received items against the lists in Section 1.5 to assure a complete order.
2.2.2 Pre Installation Bench Test
The purpose of this sub-section is to determine that the Unit meets factory performance specifications.
2.2.2.1 Test Equipment Required
TYPE CHARACTERISTIC EXAMPLE
Regulated DC Power
Supply
Voltage Range: 0 to 30Vdc
Current Range: 0 to 1Ampere
Power Designs
Model 5015
VHF Signal Generator Frequency Range: 10MHz to 400MHz
Modulation: AM, 0 to 95%
Hewlett Packard
Model 608D
VOR/LOC Generator IFR Model N-750
Glideslope Generator IFR Model N-750
Audio Generator Frequency Range: 400Hz to 3000Hz Hewlett Packard
Model 200CD
Volt-Ohmmeter DC Ranges:
Input Impedance: 10megohms min.
Ranges: 0.1V to 100V
Accuracy: 2% of range
AC Ranges:
Input Impedance: 1megohm min.
Ranges: 0.01V to 100V rms
Frequency Range: 10Hz to 1MHz
Accuracy: 2% of range
Ohmmeter:
Range: 1ohm to 10megohms
Accuracy: 5% of reading
Hewlett Packard
Model 427A
Audio Wattmeter Load Range: 100 to 1000ohms min.
Power Range: 0 to 100milliwatts min.
General Radio
Model 1840-A
Attenuator 6dB, 50ohms
2-1

NARCO AVIONICS NAV122D, NAV122D/GPS
2.2.2.2 Bench Test Wiring Harness
The harness shown in Figure 2-1 will permit bench testing of a NAV122D. Alternatively, the cable to be
installed in the aircraft may be used, providing in addition, a checkout of avionics and cabling.
Additionally a second connector and harness shown in figure 2-2 will be needed to test the
NAV122D/GPS.
2-2

INSTALLATION
SECTION 2
P810 P811
28 1+LEFTIN
29 2+RIGHTIN
3+TOIN
10 4+FROMIN
30 5+UPIN
6+DOWNIN
11 7+GSFLAGIN
8-GSFLAGIN
9ROTOR‘C’OUT
10ROTOR‘C’IN
11ROTOR‘H’OUT
12ROTOR‘H’IN
13STATOR‘F’OUT
14STATOR‘F’IN
15STATOR‘G’OUT
16STATOR‘G’IN
17STATOR‘D’OUT
18STATOR‘D’IN
19STATOR‘E’OUT
20STATOR‘E’IN
21GPSDISPLAY
22GPSDISPLAY
N
OTE: NAV122D/GPS/Resolver Chassis level BACBCED
and later should use the supplied 41444-0102
Jumper Plug Assembly for testing and for
NON- GPS use in the aircraft.
WARNING:
Attempted use of this Jumper Plug Assembly
with earlier units will cause damage to the radio.
FIGURE 2-2 ADDITIONAL BENCH TEST HARNESS FOR NAV122D/GPS
2.2.2.3 Test Procedure
Bench tests are conducted in the following sequence: A) VOR/LOC receiver and audio circuits; B) VOR
converter; C) LOC converter; D) GS receiver and converter; E) 2/5 channeling, and F) GPS display
mode.
A. VOR/LOC Receiver
1) Connect the test equipment (Section 2.2.2.1) as shown in Figure 2-1.
2) Connect the VOR generator’s RF output to the Nav connector at the rear of the NAV
Receiver.
Generator Settings: RF output to 4µV; Modulation to 30% @ 1020Hz
2-3

NARCO AVIONICS NAV122D, NAV122D/GPS
3) Set generator and receiver to a desired frequency.
4) Turn receiver volume control to maximum CW and pull to “IDENT” position; note audio
output.
Audio: 50mW minimum across 300ohms.
5) Reduce generator RF attenuator to 2µV.
6) In “IDENT” mode, reduce audio power output to 2mW (or a convenient reference);
remove modulation from generator and observe decrease in audio output.
S+N/N: 6dB minimum
7) Set generator RF attenuator to 10µV; modulation to 30% @ 1020Hz.
8) In “IDENT” mode, reduce audio power output to 2mW (or a convenient reference);
increase generator RF attenuator to 10kµV; note increase in audio power output.
AGC: +1dB maximum
9) Set generator attenuator to 500µV.
10) In “IDENT” mode, set power output to 20mW; depress NAV Receiver VOL-IDENT knob
and note decrease in audio output.
Ident Filter: 18dB minimum
B. VOR Converter
1) Modulate generator with a composite VOR signal; set RF attenuator to 500µV.
2) Check VOR accuracy at the four cardinal points (0°, 90°, 180°, 270°).
VOR Accuracy: Error shall not exceed ±1.5°
3) Rotate OBS +10°then -10°.
Course Width: full-scale deflection ±1/2 dot.
4) Decrease generator RF attenuator to less than 0.2µV; increase RF attenuator slowly and
note appearance of a full TO or FROM indication.
VOR Flag Sensitivity: 2.0µV maximum
C) LOC Converter
1) Set generator and receiver to a LOC frequency.
2) Modulate generator with a composite LOC signal; set RF attenuator to 500µV.
LOC Accuracy Centering: ±1 needle width
.093 DDM : 3dots ±1 needle width
3) Apply centering LOC signal; decrease RF attenuator to less than 0.2µV; increase
attenuator slowly and note appearance of a full TO indication.
LOC Flag Sensitivity: 2.0µV maximum
D) Glide Slope Receiver and Converter
1) Connect GS generator’s RF output to the GS connector at the rear of the NAV.
2-4

INSTALLATION
SECTION 2
2) Modulate generator with a composite GS signal; set RF attenuator to 500µV.
GS Accuracy, Centering: ±1 needle width
GS Accuracy, .091 ddm: 1.5 dots ±1 needle width
3) Apply centering GS signal; decrease RF attenuator to less that 0.2µV; increase
attenuator slowly and note appearance of a full retract of G/S flag.
GS Flag Sensitivity: 20µV maximum
E) 2 out of 5 Channeling (All outputs are active low. An external pullup will need to be used to
check for correct channeling)
1) Refer to Table 2.1 for channel coding.
2) With power applied to the NAV, connect a voltmeter between P810 pin 18 and ground.
VOR Channel: Pullup Voltage
LOC/GS Channel: +1V maximum
** NAV122D/GPS ONLY
F) GPS DISPLAY MODE
1) Connect a ground to pin 22 of P811
2) Verify that the frequency display now shows ‘GPS’
3) Press the OBS knob and verify that the frequency is recalled.
4) Channel the unit and verify that the frequency changes and is displayed for 2 seconds.
5) Remove the ground from pin 22 and apply 14V to pin 21 of P811. Repeat steps 2 thru 4
2-5

NARCO AVIONICS NAV122D, NAV122D/GPS
TABLE 2.1 DME/GS 2-Out-Of-5 CHANNEL CODE
MHz Channels
MHz
ARINC
P810
PIN
108 109 110 111 112 113 114 115 116 117
A 24 X X X X
B 5 X X X X
C 4 X X X X
D 23 X X X X
E 22 X X X X
2-Out-Of-5 Channel code cont.
KHz Channels
KHz
ARINC
P810
PIN
.00 .05 .10 .15 .20 .25 .30 .35 .40 .45 .50 .55 .60 .65 .70 .75 .80 .85 .90 .95
A 13 X X X X X X X X
B 14 X X X X X X X X
C 33 X X X X X X X X
D 32 X X X X X X X X
E 15 X X X X X X X X
Y 34 X X X X X X X X X X
NOTE: “X” Indicates active low condition.
2-6