Loss of the MLS Landing Antenna 1 Signal A320
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 |
| Ref. ASM 34-36-00 | |
| Ref. AMM 34-36-00-740-003 | BITE Test of the MMR |
| Ref. AMM 34-36-31-000-001 | Removal of the ILS Receiver |
| Ref. AMM 34-36-31-400-001 | Installation of the ILS Receiver |
3. Fault Confirmation
SUBTASK 34-36-00-740-172-A
A. Test
— Do the BITE test of the MMR1 Ref. 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) Ref. AMM 34-36-31-000-001 and Ref. AMM 34-36-31-400-001.
(a) If the fault continues:
— Remove the MMR1 Ref. AMM 34-36-31-000-001
— 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 Ref. ASM 34-36-00
— 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 Ref. AMM 34-36-31-400-001
— 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.
