Pack 2 Air Inlet Actuator Fault

TASK 21-61-00-810-850-A
Pack 2 Air Inlet 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

P2 RAM AIR IN ACTUATOR [28HH]
P2 CONTROLLER [27HH]
wiring
CONT-AIR COND SYSTEM 2 [57HH]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-33-21-618-001	Pre-conditioning through the LP Ground Connection
AMM 21-61-00-710-001	Operational Test of the Pack Temperature-Control System
ASM 216101
ASM 216102
AMM 21-61-34-000-001	Removal of the Pack Controller
AMM 21-61-34-000-002	Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-001	Installation of the Pack Controller
AMM 21-61-34-400-002	Installation of the Air-Conditioning System 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 21-61-00-710-137-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the pre-conditioning through the HP ground connection AMM 12-33-21-618-001 or with the APU AMM 12-33-21-618-001.
(2) 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 21-61-00-710-137-B ** ON A/C NOT FOR ALL

4. Fault Isolation
Subtask 21-61-00-810-166-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message P2 RAM AIR IN ACTUATOR:

replace the P2 RAM AIR IN ACTUATOR [28HH] (referred to as ACTUATOR (8HH)) AMM 21-61-51-000-001 and AMM 21-61-51-400-001.

(1) If the fault continues:

replace the P2 CONTROLLER [27HH] AMM 21-61-34-000-001 and AMM 21-61-34-400-001.

(2) If the fault continues:

do a check and repair the wiring between:
ACTUATOR (28HH) connector A/D and PC 2 (27HH) connector AB/3D,
ACTUATOR (28HH) connector A/E and PC 2 (27HH) connector AB/4A,
ACTUATOR (28HH) connector A/F and PC 2 (27HH) connector AB/4B,
ACTUATOR (28HH) connector A/A and PC 2 (27HH) connector AA/11D,
ACTUATOR (28HH) connector A/B and PC 2 (27HH) connector AA/12A,
ACTUATOR (28HH) connector A/C and PC 2 (27HH) connector AA/12B,
ACTUATOR (28HH) connector A/J and PC 2 (27HH) connector AB/15A,
ACTUATOR (28HH) connector A/K and PC 2 (27HH) connector AB/14D,
ACTUATOR (28HH) connector A/L and PC 2 (27HH) connector AB/14C,
ACTUATOR (28HH) connector A/N and PC 2 (27HH) connector AB/14B,
ACTUATOR (28HH) connector A/U and PC 2 (27HH) connector AB/6D,
ACTUATOR (28HH) connector A/V and PC 2 (27HH) connector AB/13C,
ACTUATOR (28HH) connector A/H and GND,
ACTUATOR (28HH) connector A/T and GND,
ACTUATOR (28HH) connector A/M and GND ASM 216102.

Subtask 21-61-00-810-166-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message P2 RAM AIR IN ACTUATOR(28HH):

replace the P2 RAM AIR IN ACTUATOR [28HH] AMM 21-61-51-000-001 and AMM 21-61-51-400-001.

(1) If the fault continues:

replace the CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 and AMM 21-61-34-400-002.

(2) If the fault continues:

do a check and repair the wiring ASM 216101from:
the ACTUATOR (28HH) to the ACSC2 (57HH) and,
the ACTUATOR (28HH) to ground.

Subtask 21-61-00-720-052-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:24:55 UTC