Loss of the Output Bus from the Vacuum System Controller or the CIDS Director (s) to the CFDIU

TASK 31-32-00-810-848-A
Loss of the Output Bus from the Vacuum System Controller or the CIDS Director (s) to the CFDIU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-34-000-001	Removal of the CIDS Director
AMM 23-73-34-400-001	Installation of the CIDS Director
AMM 31-32-00-740-009	Read the AVIONICS STATUS on the MCDU
ASM 313203
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
AMM 38-31-34-000-001	Removal of the Vacuum System Controller
AMM 38-31-34-400-001	Installation of the Vacuum System Controller

3. Fault Confirmation
Subtask 31-32-00-740-142-A ** ON A/C NOT FOR ALL

A. Read the AVIONICS STATUS on the MCDU AMM 31-32-00-740-009.

4. Fault Isolation
Subtask 31-32-00-810-096-A ** ON A/C NOT FOR ALL

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

(1) If the fault continues:

(a) If the fault continues:

Do a check and repair the wiring from the CFDIU (1TW) to the vacuum system controller (31MG) from pins AB/4F, 4G to pins AB/3C, 4C , ASM 313203.

Subtask 31-32-00-810-096-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message NO VSC DATA or NO CIDS-TOILET SYS DATA:

(1) If the fault continues:

(a) If the fault continues:

1 If the fault continues:

Do a check and repair the wiring from the CFDIU pins AB/4F, 4G to the CIDS director 1 (101RH) pins AA/6E, 6F ASM 313203.

a If the fault continues:

Do a check and repair the wiring from the CFDIU pins AB/4F, 4G to the CIDS director 2 (102RH) pins AA/6E, 6F ASM 313203.

Subtask 31-32-00-740-143-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:51 UTC