Failure of the CFDIU Detected by the Weather Radar 1

TASK 31-32-00-810-869-A
Failure of the CFDIU Detected by the Weather Radar 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 313202
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
AMM 34-41-00-740-002	BITE Test of the Weather Radar

3. Fault Confirmation
Subtask 31-32-00-875-053-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 31-32-00-740-182-A

B. Test
Do the BITE test of the weather radar (system 1) AMM 34-41-00-740-002.

4. Fault Isolation
Subtask 31-32-00-810-118-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message RADAR1 NO DATA FROM CFDIU:

(1) If the fault continues:

do a check and repair the wiring from the CFDIU (1TW) pins AA/2B, 2C to the first terminal block ASM 313202.

Subtask 31-32-00-810-118-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CFDIU (1TW)/WXR1 (1SQ1):

(1) If the fault continues:

do a check and repair the wiring from the CFDIU (1TW) pins AA/2B, 2C to the first terminal block ASM 313202.

Subtask 31-32-00-740-183-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:53 UTC