Failure of the CFDIU Detected by the ILS 1

TASK 31-32-00-810-870-A
Failure of the CFDIU Detected by the ILS 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

3. Fault Confirmation
Subtask 31-32-00-865-118-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/ILS/1	1RT1	G12

Subtask 31-32-00-740-184-A

B. Test
Do the BITE test of the ILS (system 1) AMM 34-36-00-740-002.

4. Fault Isolation
Subtask 31-32-00-810-119-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ILS1 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 31-32-00-810-119-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message
CFDIU(1TW)/ILS1(2RT1) or CMC1(1TM1)/ILS1(1RT1):

(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 31-32-00-740-185-A

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

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