ACSC2/ACSC1 Buses Fault

TASK 21-61-00-810-893-A
ACSC2/ACSC1 Buses Fault

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-61-00-710-001	Operational Test of the Pack Temperature-Control System
ASM 216103
AMM 21-61-34-000-002	Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-002	Installation of the Air-Conditioning System Controller

3. Fault Confirmation
Subtask 21-61-00-710-179-A ** ON A/C NOT FOR ALL

A. Do the operational test of the pack temperature-control system AMM 21-61-00-710-001.

4. Fault Isolation
Subtask 21-61-00-810-227-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ACSC2(57HH)/ACSC1(47HH) /WRG: ACSC2 BUSES TO ACSC1:

do a check and repair the wiring ASM 216103 from:
the ACSC2 (57HH) connector AA/5E to the ACSC1 (47HH) connector AA/3F,
the ACSC2 (57HH) connector AA/5F to the ACSC1 (47HH) connector AA/3G,
the ACSC2 (57HH) connector AA/6E to the ACSC1 (47HH) connector AA/4E,
the ACSC2 (57HH) connector AA/6F to the ACSC1 (47HH) connector AA/4F.

(1) If the fault continues:

(2) If the fault continues:

Subtask 21-61-00-720-064-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:24:58 UTC