Loss of the GPS Antenna 1 Signal

TASK 34-36-00-810-848-A
Loss of the GPS Antenna 1 Signal

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 20-28-00-912-003	Electrical Bonding of Electrical Connectors
AMM 34-36-00-740-003	BITE Test of the MMR
AMM 34-36-16-000-001	Removal of the GPS Active Antenna
AMM 34-36-16-400-001	Installation of the GPS Active Antenna
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-400-001	Installation of the ILS Receiver
SRM 51740000

3. Fault Confirmation
Subtask 34-36-00-740-112-A

A. Test
Do the BITE test of the MMR1 AMM 34-36-00-740-003.

4. Fault Isolation
Subtask 34-36-00-810-112-A

A. If the test gives the maintenance message
GPS ANTENNA1(43RT1)/COAX CABLE/MMR1(40RT1):

remove the MMR1 AMM 34-36-31-000-001
remove the GPS antenna 1 AMM 34-36-16-000-001
make sure that there is no moisture and/or corrosion on the coaxial cable of the GPS antenna 1
if you find corrosion damage, refer to the Structural Repair Manual SRM 51740000 for types, inspection, removal and corrosion protection.
make sure that there is continuity on the coaxial cable of the GPS antenna 1 AMM 20-28-00-912-003
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 1
repair if necessary.

(1) If the fault stops:

(2) If the fault continues:

Subtask 34-36-00-740-113-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:01 UTC