ACHC receives no Data from the CFDS

TASK 21-43-00-810-814-A
ACHC receives no Data from the CFDS

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 214302
AMM 21-43-34-000-001	Removal of the FWD Cargo Heat Controller
AMM 21-43-34-400-001	Installation of the FWD Cargo Heat Controller
AMM 21-61-00-710-001	Operational Test of the Pack Temperature-Control System
AMM 31-32-00-740-002	BITE Test of the Centralized Fault Display Interface Unit (CFDIU)

3. Fault Confirmation
Subtask 21-43-00-710-076-A

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

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

4. Fault Isolation
Subtask 21-43-00-810-072-A

A. If the test gives the maintenance message NO DATA FROM CFDS:

(1) If the operational test of the CFDS gives a different maintenance message:

(2) If the operational test of the CFDS gives TEST OK:

replace the AFT CARGO HEAT CONTROLLER [10HC] AMM 21-43-34-000-001 and AMM 21-43-34-400-001.

(a) If the fault continues:

do a check and repair the wiring of the signal ARINC 429 OUT (BUS 1) from the CFDIU (1TW) to the ACHC (10HC) ASM 214302.

Subtask 21-43-00-710-077-A

B. Do the test given in Para. 3.

5. Close-up
Subtask 21-43-00-860-063-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:24:45 UTC