Pack 1 Air Inlet Flap Actuator Fault

TASK 21-61-00-810-812-A
Pack 1 Air Inlet Flap Actuator Fault

CAUTION: DO NOT SWAP THE PACK/ACS CONTROLLERS. THIS CAN CAUSE DAMAGE TO THEM IF THERE IS AN ELECTRICAL FAULT IN THE ACTUATOR.

1. Possible Causes

P1 RAM AIR IN ACTUATOR [8HH]
wiring
P1 CONTROLLER [7HH]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-61-00-710-001	Operational Test of the Pack Temperature-Control System
ASM 216104
AMM 21-61-34-000-001	Removal of the Pack Controller
AMM 21-61-34-400-001	Installation of the Pack Controller
AMM 21-61-51-000-001	Removal of the Air-Inlet Flap Actuator
AMM 21-61-51-400-001	Installation of the Air-Inlet Flap Actuator 8HH and 28HH

3. Fault Confirmation
Subtask 21-61-00-710-072-A ** ON A/C NOT FOR ALL

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

NOTE: If a fault is detected, the PC gives a fault code for shop maintenance in addition to the related CFDS message(s) (refer to TSM chapter 21-63-00, page block 301).

Subtask 21-61-00-710-072-B ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 21-61-00-810-086-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message TEST OK, but the POST FLIGHT REPORT and/or the PREVIOUS LEG REPORT gives the maintenance message P1 RAM AIR IN ACTUATOR:

replace the P1 RAM AIR IN ACTUATOR [8HH] AMM 21-61-51-000-001 and AMM 21-61-51-400-001.

Subtask 21-61-00-810-086-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message TEST OK, but the POST FLIGHT REPORT and/or the PREVIOUS LEG REPORT gives the maintenance message P1 RAM AIR IN ACTUATOR(8HH):

replace the P1 RAM AIR IN ACTUATOR [8HH] AMM 21-61-51-000-001 and AMM 21-61-51-400-001.

Subtask 21-61-00-810-138-A

B. If the pack 1 ram-air inlet-actuator does not operate correctly on the ground with the pushbutton switch PACK 1, which is installed on the panel 30VU, in the OFF position:

replace the P1 RAM AIR IN ACTUATOR [8HH] AMM 21-61-51-000-001 and AMM 21-61-51-400-001.

Subtask 21-61-00-810-087-A ** ON A/C NOT FOR ALL

C. If the test gives the maintenance message P1 RAM AIR IN ACTUATOR:

replace the P1 RAM AIR IN ACTUATOR [8HH] AMM 21-61-51-000-001 and AMM 21-61-51-400-001.

(1) If the fault continues:

do a check and repair the wiring ASM 216104 from:
the ACTUATOR (8HH) to the PC 1 (7HH) and,
the ACTUATOR (8HH) to ground.

(2) If the fault continues:

replace the P1 CONTROLLER [7HH] AMM 21-61-34-000-001 and AMM 21-61-34-400-001.

Subtask 21-61-00-810-087-B ** ON A/C NOT FOR ALL

C. If the test gives the maintenance message P1 RAM AIR IN ACTUATOR(8HH):

replace the P1 RAM AIR IN ACTUATOR [8HH] AMM 21-61-51-000-001 and AMM 21-61-51-400-001.

(1) If the fault continues:

do a check and repair the wiring ASM 216104 from:
the ACTUATOR (8HH) to the ACSC1 (47HH) and,
the ACTUATOR (8HH) to ground.

Subtask 21-61-00-710-073-A

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

5. Close-up
Subtask 21-61-00-860-061-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:24:53 UTC