Garmin GNC 255A User Manual

190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page 1-12
1.10.1 Non-TSO Functions
There are no non-TSO functions.
1.10.2 TSO Deviations
1.10.3 FCC Grant of Equipment Authorization
TSO/ETSO Deviation
TSO-C34e
1. Garmin was granted a deviation from the TSO not to mark TSO number and software part
number on the exterior of the unit.
2. Garmin was granted a deviation from the TSO to use RTCA/DO-160F instead of an earlier
version as the standard for environmental conditions and test.
3. Garmin was granted a deviation from the TSO to use RTCA/DO-178B instead of an earlier
version to demonstrate compliance for the verification and validation of the computer software.
TSO-C36e
1. Garmin was granted a deviation from the TSO not to mark TSO number and software part
number on the exterior of the unit.
2. Garmin was granted a deviation from the TSO to use RTCA/DO-160F instead of an earlier
version as the standard for environmental conditions and test.
3. Garmin was granted a deviation from the TSO to use RTCA/DO-178B instead of an earlier
version to demonstrate compliance for the verification and validation of the computer software.
TSO-C40c
1. Garmin was granted a deviation from the TSO not to mark TSO number and software part
number on the exterior of the unit.
2. Garmin was granted a deviation from the TSO to use RTCA/DO-160F instead of an earlier
version as the standard for environmental conditions and test.
3. Garmin was granted a deviation from the TSO to use RTCA/DO-178B instead of an earlier
version to demonstrate compliance for the verification and validation of the computer software.
ETSO-2C40c
1. Garmin was granted a deviation from the ETSO to have a deflection response of 0.5 to 2.7
seconds.
TSO-C128a
1. Garmin was granted a deviation from the TSO not to mark TSO number and software part
number on the exterior of the unit.
2. Garmin was granted a deviation from the TSO to use RTCA/DO-160F instead of an earlier
version as the standard for environmental conditions and test.
TSO-C169a
1. Garmin was granted a deviation from the TSO not to mark TSO number and software part
number on the exterior of the unit.
2. Garmin was granted a deviation from the TSO to use RTCA/DO-160F instead of an earlier
version as the standard for environmental conditions and test.
Model FCC ID IC ID
GTR 225
IPH-01594 1312A-01594
GTR 225A
GTR 225B
GNC 255A
GNC 255B

Garmin GNC 255A Specifications

General

Brand	Garmin
Model	GNC 255A
Category	Transceiver
Language	English

Summary

General Description

General Specifications

COM Specifications

Technical specifications for the COM transceiver functions.

VOR Specifications

Technical specifications for VOR reception.

LOC Specifications

Technical specifications for LOC reception.

Glideslope Specifications

Technical specifications for Glideslope reception.

Limitations

Installation Overview

Antenna Considerations

Cabling and Wiring Considerations

Installation Procedures

Equipment Mounting

Connector Pinout Information

Pin Function List

Detailed pin assignments for COM and NAV connectors.

Power, Lighting, And Antennas

Serial Data – RS-232

Post Installation Configuration and Checkout Procedures

System Configuration Overview

Mounting, Wiring, and Power Checks

Verifying installation integrity and power connections.

Configuration Mode Operations

Steps to access and navigate configuration settings.

Ground Checks (Configuration Mode)

Verification tests performed in configuration mode.

Ground Checks (Normal Mode)

Functional checks performed in normal operating mode.

Flight Checks

Procedures for verifying system performance in flight.

Software Loading

Appendix B GTR/GNC Data Format

Appendix D Interconnect Diagrams

Drawing List