Loss of the ADF1 Data Bus Identified by the EIS1

TASK 34-53-00-810-803-A
Loss of the ADF1 Data Bus Identified by the EIS1

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

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC
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 34-53-00-865-050-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/ADF/1	1RP1	H14
** ON A/C NOT FOR ALL
49VU	NAV/ADF/1	1RP1	F09

Subtask 34-53-00-740-054-A ** ON A/C NOT FOR ALL

B. Test
(1) Do the EIS input test AMM 31-60-00-740-002.

Subtask 34-53-00-740-054-B ** ON A/C NOT FOR ALL

B. Test
(1) Do the Ground Scanning Test of the DMC AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 34-53-00-810-054-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC1: NO ADF1 DATA:

(1) 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 34-53-00-810-054-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC1: ADF1(2RP1)/DMC1(1WT1)

(1) 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 34-53-00-740-055-A

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:33:26 UTC