Loss of the Bus Output from the Weather Radar Transceiver 1 to the CFDIU

TASK 31-32-00-810-830-A
Loss of the Bus Output from the Weather Radar Transceiver 1 to the CFDIU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
ASM 313202
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
AMM 34-41-33-000-004	Removal of the Weather Radar Transceiver
AMM 34-41-33-400-003	Installation of the Weather Radar Transceiver

3. Fault Confirmation
Subtask 31-32-00-865-077-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	COM NAV/RADAR/1	5SQ1	K13

Subtask 31-32-00-740-106-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 31-32-00-810-078-A

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

(1) If the fault continues:

replace the XCVR-WEATHER RADAR, 1 [1SQ1] , AMM 34-41-33-000-004 and AMM 34-41-33-400-003.

(a) If the fault continues:

do a check and repair the wiring from the CFDIU (1TW) to the weather radar transceiver 1 (1SQ1) from pins AA/11B, 11C to pins AB/1J, 1K , ASM 313202.

Subtask 31-32-00-740-107-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:29:50 UTC