Loss of the ADF 1 Data on the ND

TASK 34-53-00-810-820-A
Loss of the ADF 1 Data on the ND

1. Possible Causes

RECEIVER-ADF, 1 [2RP1]
ANTENNA-ADF LOOP AND SENSE, 1 [3RP1]
wiring from the ADF loop and sense antenna 1 (3RP1) to the ADF receiver 1 (2RP1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-53-00-710-002	Operational Test of the ADF
AMM 34-53-00-740-003	BITE Test of the ADF
ASM 345301
AMM 34-53-11-000-001	Removal of the ADF Loop and Sense Antenna
AMM 34-53-11-400-001	Installation of the ADF Loop and Sense Antenna
AMM 34-53-31-000-002	Removal of the ADF Receiver
AMM 34-53-31-400-002	Installation of the ADF Receiver

3. Fault Confirmation
Subtask 34-53-00-710-056-A

A. Test
(1) Do the operational test of the ADF AMM 34-53-00-710-002.

4. Fault Isolation
Subtask 34-53-00-810-073-A

A. If the ADF 1 data do not come into view on the ND:

(1) If the test gives a maintenance message:

(2) If the test does not give a maintenance message:

(a) If the fault continues:

replace the ANTENNA-ADF LOOP AND SENSE, 1 [3RP1] AMM 34-53-11-000-001 and AMM 34-53-11-400-001.

1 If the fault continues:

do a check and repair the wiring from the ADF loop and sense antenna 1 (3RP1) to the ADF receiver 1 (2RP1) ASM 345301.

Subtask 34-53-00-710-057-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:27 UTC