Loss of the PACK 2 CONT Bus or the ACSC2 Bus to the SDAC 2

TASK 31-54-00-810-908-A
Loss of the PACK 2 CONT Bus or the ACSC2 Bus to the SDAC 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-61-34-000-001	Removal of the Pack Controller
AMM 21-61-34-000-002	Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-001	Installation of the Pack Controller
AMM 21-61-34-400-002	Installation of the Air-Conditioning System Controller
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 31-54-00-865-126-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20

Subtask 31-54-00-710-252-A

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

4. Fault Isolation
Subtask 31-54-00-810-157-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message SDAC2 : NO DATA FROM PACK2 CONT:

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the SDAC 2 (1WV2) pins AE/13A, 13B to the first terminal block , ASM 315403.

Subtask 31-54-00-810-157-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:

SDAC2 : NO DATA FROM ACSC2

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the SDAC 2 (1WV2) pins AA/13A, 13B to the Air Conditioning System Controller 2 pins AA/7E, 7F, ASM 315403.

Subtask 31-54-00-710-253-A

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

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