Removal of the FWD Cargo Compartment Trim Air Valve

TASK 21-43-53-000-001-A
Removal of the FWD Cargo Compartment Trim Air Valve

FIN: 2HC ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
131NW, 131PW, 825

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
FWD Cargo Trim Air Valve

3. Job Set-up
Subtask 21-43-53-861-050-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 21-43-53-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/FWD CARGO/VENT/CTL & MONG	2HN	C08

Subtask 21-43-53-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the FWD cargo door 825.
(2) Open the FWD cargo access door 825 (Ref. AMM TASK 52-30-00-860-001).
(3) Remove the access panels 131NW 131PW.

4. Procedure
Subtask 21-43-53-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the FWD Cargo Trim Air Valve
(1) Disconnect the electrical connector (4) from the trim air valve (9).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the nut (11), the washer (10) and the bolt (5) that connect the bonding strap (6) to the trim air valve (9).
(4) Remove the V-clamps (7) and (12) and the O-rings (2) and (8). Connect the trim air valve (9) to the trim air duct (3) and the venturi (1).
(5) Close the trim air valve with the manual override knob. Safety the valve in the closed position with the locking pin. The locking pin is kept in a hole in the trim air valve-body.
(6) Remove the trim air valve (9) from between the trim air duct (3) and the venturi (1).

[Rev.10 from 2021] 2026.04.02 06:11:20 UTC