ACSC1 Spurious Fault

TASK 21-61-00-810-923-A
ACSC1 Spurious 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
AMM 31-32-00-860-002	Procedure to Get Access to the SYSTEM REPORT/TEST/AIR COND Page

3. Fault Confirmation
Subtask 21-61-00-710-220-A ** ON A/C NOT FOR ALL

A. Test

NOTE: This test is necessary to confirm spurious fault.
Refer to the OIT 999.0041/15.

(1) Do a read out of the TROUBLE SHOOTING DATA (TSD) of the fault message:
(a) On the MCDU, get the SYSTEM REPORT/TEST/AIR COND menu page AMM 31-32-00-860-002.
(b) On the AIR COND menu page:

push the line key adjacent to the TEMP CTL indication.
the CAB TEMP CONT menu page comes into view.

push the line key adjacent to the LAST LEG REPORT or GROUND REPORT indication.
the LAST LEG REPORT or GROUND REPORT page comes into view.

(d) Push the line key adjacent to the prompt ">" at the right of the Class number of the fault message ACSC1 (47HH):

make sure that the TROUBLE SHOOTING DATA (TSD) gives the fault code 36F9.

(2) Make sure that ACSC1 serial number (S/N) is listed in OIT 999.0041/15.

4. Fault Isolation
Subtask 21-61-00-810-274-A ** ON A/C NOT FOR ALL

A. If the test does confirm spurious fault:
(1) Do the reset procedure for the ACSC1 as follows,
(a) open the circuit breakers 49HH, 50HH, 51HH and 52HH.
(b) wait for a minimum of 10 seconds.
(c) close the circuit breakers 49HH, 50HH, 51HH and 52HH.
(2) Do the operational test of the pack temperature-control system AMM 21-61-00-710-001.
(3) If the fault continues:
(a) No further trouble shooting necessary.
(b) Aircraft can be dispatched under MMEL condition.

[Rev.8 from Aug 2018] 2026.04.04 04:25:00 UTC