Loss of the PHC 1 Output Bus of the SDAC 2

TASK 31-54-00-810-974-A
Loss of the PHC 1 Output Bus of the SDAC 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
ASM 315403
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-865-161-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
49VU	ANTI ICE/PROBES/PHC/1	2DA1	D03
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
122VU	ANTI ICE/PROBES/1/TAT	1DA1	Z12

Subtask 31-54-00-710-379-A ** ON A/C NOT FOR ALL

B. Test
Do the ground scanning of the central warning system AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-54-00-810-224-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message SDAC2:NO DATA FROM PHC1:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 2 (1WV2) pins AE/07B, 07C to the first terminal block, ASM 315403.

Subtask 31-54-00-710-380-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:35 UTC