Loss of the Bus Output from the RMP 1 to the CFDIU

TASK 31-32-00-810-911-A
Loss of the Bus Output from the RMP 1 to the CFDIU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 231302
AMM 23-13-13-000-001	Removal of the Radio Management Panel (RMP)
AMM 23-13-13-400-001	Installation of the Radio Management Panel (RMP)
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU

3. Fault Confirmation
Subtask 31-32-00-865-153-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	COM/RMP/1	2RG1	G10

Subtask 31-32-00-860-050-A

B. Job Set-up
Make sure that only the ON/OFF switch on the RMP 1 is at ON.

Subtask 31-32-00-740-268-A

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

4. Fault Isolation
Subtask 31-32-00-810-161-A

A. If the test gives the maintenance message NO RMP1 DATA:

(1) If the fault continues:

replace the RMP-COM/NAV FREQ SEL, 1 [1RG1] AMM 23-13-13-000-001 and AMM 23-13-13-400-001.

(2) If the fault continues:

do a check and repair the wiring from CFDIU (1TW) pins AA/10D, 10E to RMP 1 (1RG1) pins A/<P, <Q ASM 231302.

Subtask 31-32-00-740-269-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:29:57 UTC