Loss of the ESS TRU CURRENT Bus of the SDAC 1

TASK 31-54-00-810-879-A
Loss of the ESS TRU CURRENT Bus of the SDAC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 243401
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-865-107-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
106VU	ESS TR/SPLY	4PE	C01

Subtask 31-54-00-710-194-A

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

4. Fault Isolation
Subtask 31-54-00-810-128-A

A. If the test gives the maintenance message SDAC 1 : NO TR ESS CURRENT 1PE:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 1 (1WV1) pins AB/14E, 14F to the first terminal block , ASM 243401.

Subtask 31-54-00-710-195-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:30:29 UTC