Loss of the DME 1 Data Bus Identified by the CFDS

TASK 34-51-00-810-806-A
Loss of the DME 1 Data Bus Identified by the CFDS

1. Possible Causes

INTRG-DME, 1 [2SD1]
wiring of the DISTANCE DATA OUTPUT 2 bus from the DME interrogator 1 (2SD1) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
ASM 345101
AMM 34-51-33-000-001	Removal of the DME Interrogator
AMM 34-51-33-400-001	Installation of the DME Interrogator

3. Fault Confirmation
Subtask 34-51-00-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	NAV/DME/1	1SD1	G14

Subtask 34-51-00-740-060-A

B. Test
On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

4. Fault Isolation
Subtask 34-51-00-810-057-A

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

(1) If the fault continues:

do a check and repair the wiring of the DISTANCE DATA OUTPUT 2 bus from the DME interrogator 1 (2SD1) to the first terminal block ASM 345101.

Subtask 34-51-00-740-061-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:33:19 UTC