Loss of the PHC 2 Output Bus of the SDAC 2

TASK 31-54-00-810-976-A
Loss of the PHC 2 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 31-54-00-865-163-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
122VU	ANTI ICE/PROBES/2/TAT	1DA2	Y15
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/PHC/2	2DA2	Y12
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11

Subtask 31-54-00-710-383-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 31-54-00-810-226-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message SDAC2:NO DATA FROM PHC2:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 2 (1WV2) pins AE/08C, 08D to the first terminal block, ASM 315403.

Subtask 31-54-00-710-384-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