FWD Cargo-Compartment Fan Fault

TASK 21-28-00-810-803-A
FWD Cargo-Compartment Fan 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 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
ASM 216301
ASM 216303
AMM 21-63-34-000-001	Removal of the Zone Controller
AMM 21-63-34-400-001	Installation of the Zone Controller

3. Fault Confirmation
Subtask 21-28-00-710-052-A

A. Test

NOTE: This fault isolation procedure is applicable although the FWD cargo-compartment ventilation system is not installed.

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

4. Fault Isolation
Subtask 21-28-00-810-066-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWD CARGO FAN OR SPLY:

(1) If the fault continues:
(a) Remove the ZONE CONTROLLER [8HK] .
(b) Do a check and repair the wiring between:

Subtask 21-28-00-810-066-C ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWD CARGO FAN OR SPLY:

(1) If the fault continues:
(a) Remove the CONT-AIR COND SYSTEM 1 [47HH] .
(b) Do a check and repair the wiring between:

Subtask 21-28-00-710-061-A

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

5. Close-up
Subtask 21-28-00-860-052-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:24:40 UTC