AFT Cargo-Compartment Trim-Air Regulation Fault

TASK 21-43-00-810-808-A
AFT Cargo-Compartment Trim-Air Regulation Fault

1. Possible Causes

AFT CARGO TRIM AIR VALVE [12HC]
wiring
AFT CARGO HEAT CONTROLLER [10HC]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-43-00-740-002	Power-up (BITE) Test of the Cargo-Compartment Heating Controller
ASM 214302
AMM 21-43-34-000-002	Removal of the AFT Cargo Heat Controller
AMM 21-43-34-400-002	Installation of the AFT Cargo Heat Controller
AMM 21-43-51-000-001	Removal of the Aft Cargo-Trim Air-Valve
AMM 21-43-51-400-001	Installation of the Aft Cargo-Trim Air-Valve

3. Fault Confirmation
Subtask 21-43-00-710-057-A

A. To Confirm the Fault
(1) Do a read out of the POST FLIGHT and/or LAST LEG REPORT.
(2) Do the power-up (BITE) test of the cargo compartment heating controller AMM 21-43-00-740-002.

4. Fault Isolation
Subtask 21-43-00-810-057-A

A. If the conditions which follow occur:

the POST FLIGHT and/or the LAST LEG REPORT gives the maintenance message AFT TRIM AIR VALVE and,
on the lower ECAM display unit COND page the AFT trim-air valve position shows amber XX:
replace the AFT CARGO TRIM AIR VALVE [12HC] AMM 21-43-51-000-001 and AMM 21-43-51-400-001.

(1) If the fault continues:

do a check and repair the wiring ASM 214302 from:
the VALVE (12HC) to the ACHC (10HC) and,
the VALVE (12HC) to ground.

(2) If the fault continues:

replace the AFT CARGO HEAT CONTROLLER [10HC] AMM 21-43-34-000-002 and AMM 21-43-34-400-002.

Subtask 21-43-00-710-068-A

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

5. Close-up
Subtask 21-43-00-860-056-A

A. Put the aircraft back to its initial configuration.

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