Loss of the VOR 1 Data Bus Identified by the EIS 1

TASK 34-55-00-810-803-A
Loss of the VOR 1 Data Bus Identified by the EIS 1

1. Possible Causes

RECEIVER-VOR/MKR, 1 [3RS1]
wiring of the OMNI BEARING AND SIGNAL MKR OUTPUT 2 bus from the VOR/MKR receiver 1 (3RS1) 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 345501
AMM 34-55-31-000-001	Removal of the VOR/MKR Receiver
AMM 34-55-31-400-001	Installation of the VOR/MKR Receiver

3. Fault Confirmation
Subtask 34-55-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	NAV/VOR/1	2RS1	G13

Subtask 34-55-00-740-054-A ** ON A/C NOT FOR ALL

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

Subtask 34-55-00-740-054-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 34-55-00-810-054-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC 1 : NO VOR 1 DATA:

(1) If the fault continues:

do a check and repair the wiring of the OMNI BEARING AND SIGNAL MKR OUTPUT 2 bus from the VOR/MKR receiver 1 (3RS1) to the first terminal block ASM 345501.

Subtask 34-55-00-810-054-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC 1 : VOR1(3RS1)/DMC1(1WT1)

(1) If the fault continues:

do a check and repair the wiring of the OMNI BEARING AND SIGNAL MKR OUTPUT 2 bus from the VOR/MKR receiver 1 (3RS1) to the first terminal block ASM 345501.

Subtask 34-55-00-740-055-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:40:27 UTC