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GNC 255A
Garmin GNC 255A User Manual
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190-01182-02
GTR 225/GNC 255 TSO Installation Manual
Rev. F
Page C-2
Figure C-1 GT
R/GNC Dimensions
6.250 [158.75]
BEZE
L
1.715 [43.56]
6.300 [160.02]
RACK
1
1.230 [285.24] STRAIN RELIEF
10.410 [264.41] COAX
1.650 [41.91]
BEZE
L
0.650 [16.51]
0.437 [1
1.10]
8.000 [203.20]
0.325 [8.26]
Ø.200 [5.08 THRU
CS'K Ø.300 [7.62] x 100° INSIDE RACK
(3 PER SIDE)
0.770 [19.56]
0.700 [17.78]
1.725 [43.82]
9.090 [230.89]
98
100
Table of Contents
Default Chapter
6
Table of Contents
6
1 General Description
12
Introduction
12
Equipment Description
12
Table 1-1 TSO-Certified Units
12
General Specifications
14
Table 1-2 Physical Specifications
14
Table 1-3 Display Specifications
14
COM Specifications
15
Table 1-4 COM Transmitter Specifications
15
Table 1-5 COM Receiver Specifications
16
VOR Specifications
17
Table 1-6 vor Specifications
17
LOC Specifications
18
Table 1-7 LOC Specifications
18
Glideslope Specifications
19
Table 1-8 Glideslope Specifications
19
Current Draw Specifications
20
Table 1-9 GTR/GNC Current Draw Specifications
20
License Requirements
21
Certification
22
Table 1-10 TSO Authorization and Advisory Circular References
22
Table 1-11 System Functions
22
GTR/GNC Database
24
Aviation Limited Warranty
25
2 Limitations
26
Installation
26
Aircraft Radio
26
3 Installation Overview
27
Introduction
27
Antenna Considerations
27
GTR/GNC Mounting Considerations
28
Cabling and Wiring Considerations
29
Air Circulation and Cooling
29
Compass Safe Distance
29
4 Installation Procedures
30
Unit and Accessories
30
Miscellaneous Options
30
Table 4-1 Catalog P/Ns
30
Table 4-2 Standard Kit Accessories
30
Table 4-3 Miscellaneous Options
30
Optional Reference Material
31
Installation Materials Required but Not Supplied
31
Table 4-4 Optional Reference Material
31
Special Tools Required
32
Table 4-5 Recommended Crimp Tools (or Equivalent)
32
Table 4-6 Socket Contact P/Ns
32
Coaxial Cable Installation
33
Equipment Mounting
33
COM Antenna Installation and Connections
34
5 Connector Pinout Information
35
Pin Function List
35
Power, Lighting, and Antennas
39
6 Post Installation Configuration and Checkout Procedures
50
System Configuration Overview
50
Mounting, Wiring, and Power Checks
50
Connector Engagement Check
51
Configuration Mode Operations
51
Figure 6-1 Configuration Mode Page
51
Figure 6-2 Serial Port Page
52
Figure 6-3 DST Priority Page
52
Table 6-1 Serial Port Selections
52
Figure 6-4 Intercom Enable Page
53
Figure 6-5 Backlight Page
53
Table 6-2 Intercom Enable Page Selections
53
Table 6-3 Backlight Selections
53
Table 6-4 Photocell Page Parameter Description
54
Figure 6-7 Lighting Bus Page
55
Figure 6-8 Display Information Pages
55
Table 6-5 Lighting Bus Parameter Description
55
Figure 6-9 Software Update Page
56
Figure 6-10 CDI Indicator Page
56
Table 6-6 CDI Indicator Selections
56
Figure 6-11 Calibrate OBS Resolver Page
57
Figure 6-12 ARINC 429 Page
57
Table 6-7 ARINC 429 Configuration Speed (TX)
57
Table 6-8 SDI Selections
57
Table 6-9 DME Settings
58
Table 6-10 A429 Settings
58
Figure 6-13 NAV Information Page
59
Figure 6-14 NAV Software Update Page
59
Figure 6-15 MIC Gain Page
60
Figure 6-16 COM RX Squelch Page
60
Figure 6-17 COM Information Page
61
Table 6-11 COM RX Squelch Selections
61
Table 6-12 COM RX Squelch Settings
61
Figure 6-18 COM Software Update Page
62
Figure 6-19 COM Sidetone Page
62
Table 6-13 COM Sidetone Mode Selections
62
Figure 6-20 MIX NAV Audio Page
63
Figure 6-21 Hi-Fidelity Audio Page
63
Table 6-14 COM Sidetone Pilot Control
63
Figure 6-22 Download Log Page
64
Figure 6-23 Clear Error Logs Page
64
Ground Checks (Configuration Mode)
65
Figure 6-24 Calibrate OBS Resolver Page
65
Figure 6-25 Test Analog Flags Page
66
Figure 6-26 Test CDI/VDI Page
67
Ground Checks (Normal Mode)
68
Table 6-15 Discrete Input Pins
68
Flight Checks
71
Software Loading
72
Table 6-16 Software Compatibility
72
Figure 6-27 USB Update Progress
73
Figure 6-28 Database Update Page
74
Figure 6-29 Database Info Page
74
7 Continued Airworthiness
75
Appendix A Environmental Qualification Form
76
Appendix B Gtr/Gnc Data Format
77
Aviation Format
77
Table B-1 Aviation Output Sentence Format
78
Table B-2 Type 2 Aviation Output Sentence Format
80
NMEA Data Format
81
Table B-3 Input Message Summary
97
Table B-4 Output Message Summary
97
Appendix Cmechanical Drawings
98
Drawing List
98
Figure C-1 GTR/GNC Dimensions
98
Figure C-2 GTR/GNC Mounting Rack
98
Figure C-3 GNC Center of Gravity
98
Figure C-4 GTR Center of Gravity
98
Figure C-5 GTR/GNC Rear Connector Layout Detail
98
Figure C-6 Panel Cutout Detail
98
Figure C-7 GTR Mounting Rack
98
Appendix D Interconnect Diagrams
106
Drawing List
106
Figure D-1 GTR/GNC System Interface Diagram
106
Figure D-3 GTR/GNC Power Lighting Configuration Interconnect
106
Figure D-6 GTR/GNC - MIC Interconnect
106
Figure D-8 GTR/GNC Switches Interconnect
106
Figure D-9 GNC - RMI OBI Interconnect
106
Figure D-2 GTR/GNC Typical Installation
108
Figure D-4 GTR/GNC - Antennas Interconnect
111
Figure D-5 GTR/GNC - Audio Panel Interconnect
115
Figure D-7 GNC - VOR/ILS Interconnect
119
Figure D-10 GNC - King Serial DME - Remote Mount Interconnect
123
Figure D-11 GNC - Parallel 2 of 5 DME Tuning Interconnect
125
Figure D-12 GNC - Parallel Slip Code DME Tuning Interconnect
126
Figure D-13 GNC - King Serial DME - Panel Mount Interconnect
128
Figure D-14 GNC - GDU 620 Interconnect
129
Figure D-15 GTR/GNC - GTN 6XX/7XX, GNS 400W/500W, and GNS 480 Interconnect
130
Figure D-16 GTR/GNC - GMX 200 Interconnect
131
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Garmin GNC 255A Specifications
General
Brand
Garmin
Model
GNC 255A
Category
Transceiver
Language
English
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