Loss of the GPS Antenna 1 Signals

TASK 34-58-00-810-815-A
Loss of the GPS Antenna 1 Signals

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-58-00-740-001	BITE Test of the GPS
AMM 34-58-11-000-001	Removal of the GPS Antenna
AMM 34-58-11-400-001	Installation of the GPS Antenna with Teflon Seal
AMM 34-58-31-000-001	Removal of the GPSSU
AMM 34-58-31-400-001	Installation of the GPSSU

3. Fault Confirmation
Subtask 34-58-00-740-078-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the GPS (system 1) AMM 34-58-00-740-001.

4. Fault Isolation
Subtask 34-58-00-810-064-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message GPSSU1 (1SN1) COAXIAL CABLE:

(1) If the fault continues:

get access to the GPS antenna 1 AMM 34-58-11-000-001
disconnect the coaxial cable
make sure that there is continuity on the coaxial cable of the GPS antenna 1
replace the coaxial cable if necessary
make sure that there is discontinuity between the core and shield of the coaxial cable of the GPS antenna
repair if necessary.

(a) If the fault stops:

(b) If the fault continues:

Subtask 34-58-00-740-079-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:34 UTC