Loss of the MLS Landing Antenna 1 Signal

TASK 34-36-00-810-880-A
Loss of the MLS Landing Antenna 1 Signal

1. Possible Causes

MMR-1 [40RT1]
coaxial cable between the MMR1 and the MLS landing antenna 1

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 343600
AMM 34-36-00-740-003	BITE Test of the MMR
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-000-002
AMM 34-36-31-400-001	Installation of the ILS Receiver
AMM 34-36-31-400-002

3. Fault Confirmation
Subtask 34-36-00-740-172-A

A. Test

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

4. Fault Isolation
Subtask 34-36-00-810-149-B

A. If the test gives the maintenance message from the MMR1
MLS LANDING ANT1(57RT1)/ COAX CABLE MMR1(40RT1):
(1) Replace the MMR-1 [40RT1] AMM 34-36-31-000-001 and AMM 34-36-31-400-001.
(a) If the fault continues:

remove the MMR1 AMM 34-36-31-000-002
disconnect the coaxial cable from the MLS landing antenna 1
make sure that there is continuity on the coaxial cable between the MMR1 and the MLS landing antenna 1 ASM 343600
replace the coaxial cable if necessary
make sure that there is discontinuity between the core and the shield of the coaxial cable of the MLS landing antenna 1
repair if necessary
install the MMR1 AMM 34-36-31-400-002
connect the coaxial cable to the MLS landing antenna 1.

5. Close-up
Subtask 34-36-00-740-173-A

A. Do the test given in para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:03 UTC