Textron Aviation 208 Maintenance Manual

COMANT GLOBAL POSITIONING SYSTEM (GPS)/XM ANTENNA - REMOVAL/INSTALLATION
1. General
A. This section gives the removal and installation procedures for the Comant GPS and the GPS/XM antennas, which are
installed on the top of the airplane cabin. For a general overview of the G1000 GPS system (Refer to Garmin G1000
Global Positioning System - Description and Operation.
2. Tools and Equipment
A. Tools and Equipment
• None.
B. Special Consumables
• None.
C. Reference Material
• Chapter 20, Electrical Bonding - Maintenance Practices
• Chapter 20, Fuel, Weather and High-Temperature Sealing - Maintenance Practices
• Chapter 20, Adhesive and Solvent Bonding - Maintenance Practices
• Garmin GDL 69A XM Data Link System - Adjustment/Test
• Garmin G1000 Global Positioning System - Description and Operation
• Garmin G1000 Global Positioning System - Adjustment/Test.
3. Setup
A. Prepare the Airplane
(1) Make sure that the BATTERY switch, found on the circuit breaker switch panel, is set to the OFF position.
(2) Make sure that the AVIONICS switches on the circuit breaker switch panel, are set to the OFF position.
(3) Disconnect external electrical power from the airplane.
(4) Disengage the applicable circuit breaker given in Table 401.
Table 401. Circuit Breakers
GPS Component
GPS/XM Antenna (left)
GPS Antenna (right)
(5) Remove the headliner as necessary to gain access to the antennas and antenna cables.
4. Comant GPS/XM or GPS Antenna Removal
A. Remove the GPS/XM or GPS Antenna (Refer to Figure 401).
NOTE: The removal procedure for the GPS/XM (left) and the GPS (right) antennas are typical.
(1) Remove the sealant from the top of the screws.
(2) Remove the screws that attach the antenna to the doubler.
(3) Break the bond of the sealant between the bottom of the antenna and the doubler.
(4) Carefully lift the antenna sufficiently to get access to the coaxial cable.
NOTE:
(5) Disconnect the coaxial cable from the antenna.
(6) Remove the antenna from the airplane.
(7) Clean all the sealant from the mating surfaces of the antenna and the doubler. Refer to Chapter 20, Fuel, Weather
and High-Temperature Sealing - Maintenance Practices.
5. Comant GPS/XM or GPS Antenna Installation
A. Remove the GPS/XM or GPS Antenna (Refer to Figure 401).
NOTE: The installation procedure for the GPS/XM (left) and the GPS (right) antennas are typical.
Copyright © Textron Aviation Inc.
Retain printed data for historical reference only. For future maintenance, use only current data.
Circuit Breaker Name
COM1
NAV1
COM2
NAV2
The left GPS/XM antenna has two coaxial cables.
Model 208/208B Maintenance Manual (Rev 33)
34-57-05-4 (Rev 31)
Circuit Breaker Location
Avionics Circuit Breaker Panel
Avionics Circuit Breaker Panel
Avionics Circuit Breaker Panel
Avionics Circuit Breaker Panel
Print Date: Thu May 18 07:22:36 CDT 2023
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