ACSC receives no Data from the CFDS

TASK 21-61-00-810-918-A
ACSC receives no Data from the CFDS

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 216101
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
AMM 21-63-00-710-004	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
AMM 31-32-00-740-002	BITE Test of the Centralized Fault Display Interface Unit (CFDIU)
ASM 313205

3. Fault Confirmation
Subtask 21-61-00-710-210-A ** ON A/C NOT FOR ALL

A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.

NOTE: Make sure that the circuit breakers 2TW and 8TW are closed during the test.

4. Fault Isolation
Subtask 21-61-00-810-256-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CFDIU(1TW):

(1) If the test gives a different maintenance message, do the related trouble shooting procedure.
(2) If the fault continues:

(3) If the fault continues:

do a check and repair the wiring of the signal ARINC 429 OUT (BUS 4) from the CFDIU (1TW) to the ACSC2 (57HH) ASM 216101 and ASM 313205.

Subtask 21-61-00-710-211-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

5. Close-up
Subtask 21-61-00-860-096-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:24:59 UTC