Removal of the Fwd Cargo Compartment Differential Pressure Switch

TASK 21-28-11-000-001-A
Removal of the Fwd Cargo Compartment Differential Pressure Switch

ZONE: 132
FIN: 21HN ** 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	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
132	FORWARD CARGO COMPARTMENT
132KW, 825

C. Referenced Information

REFERENCE	DESIGNATION
Differential Pressure Switch

3. Job Set-up
Subtask 21-28-11-865-050-A ** ON A/C NOT FOR ALL

A. 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
122VU	FWD CARGO VENT AND HTG/FAN	1HN	T22

Subtask 21-28-11-941-050-A ** ON A/C NOT FOR ALL

B. Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.

Subtask 21-28-11-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the access door 825.
(2) Remove the panel 132KW.

4. Procedure
Subtask 21-28-11-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Pressure Switch
(1) Disconnect the electrical connector (2).
(2) Put a CAP - BLANKING on the disconnected electrical connector (2).
(3) Remove the pipe (1).
(4) Put a PLUG - BLANKING on the disconnected pipe (1) end.
(5) Remove the screws (4) and the washers (3).
(6) Remove the pressure switch (5).

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