ADF 1 System Inoperative

TASK 34-53-00-810-819-A
ADF 1 System Inoperative

1. Possible Causes

RECEIVER-ADF, 1 [2RP1]
wiring of the BEARING OUTPUT 2 bus from the ADF receiver 1 (2RP1) to the first terminal block
DMC-1 [1WT1]
wiring of the ADF 1 INPUT bus from the DMC 1 (1WT1) to the first terminal block
DMC-3 [1WT3]
wiring of the ADF 1 INPUT bus from the DMC 3 (1WT3) to the first terminal block
DMC-2 [1WT2]
wiring of the ADF 1 INPUT bus from the DMC 2 (1WT2) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC
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 34-53-31-000-002	Removal of the ADF Receiver
AMM 34-53-31-400-002	Installation of the ADF Receiver

3. Fault Confirmation
Subtask 34-53-00-710-054-A

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

4. Fault Isolation
Subtask 34-53-00-810-070-A

A. If on the two NDs:
. the ADF 1 data do not come into view
. the red flag is shown:

(1) If the BITE test gives a maintenance message:

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

(a) If the fault continues:

do a check and repair the wiring of the BEARING OUTPUT 2 bus from the ADF receiver 1 (2RP1) to the first terminal block ASM 345301.

Subtask 34-53-00-810-071-A

B. If on the CAPT ND only:
. the ADF 1 data do not come into view
. the red flag is shown:

make sure that on the center pedestal, on the SWITCHING panel 8VU, the EIS DMC selector switch is at CAPT 3:

(1) If no:

(a) If the fault continues:

do a check and repair the wiring of the ADF 1 INPUT bus from the DMC 1 (1WT1) to the first terminal block ASM 345301.

(2) If yes:

(a) If the fault continues:

do a check and repair the wiring of the ADF 1 INPUT bus from the DMC 3 (1WT3) to the first terminal block ASM 345301.

Subtask 34-53-00-810-072-A

C. If on the F/O ND only:
. the ADF 1 data do not come into view
. the red flag is shown:

make sure that on the center pedestal, on the SWITCHING panel 8VU, the EIS DMC selector switch is at F/O 3:

(1) If no:

(a) If the fault continues:

do a check and repair the wiring of the ADF 1 INPUT bus from the DMC 2 (1WT2) to the first terminal block ASM 345301.

(2) If yes:

(a) If the fault continues:

do a check and repair the wiring of the ADF 1 INPUT bus from the DMC 3 (1WT3) to the first terminal block ASM 345301.

Subtask 34-53-00-710-055-A

D. Do the test given in Para. 3.

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