Removal of the APU Fuel Pressure Switch

TASK 28-22-15-000-001-A
Removal of the APU Fuel Pressure Switch

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

FIN: 7QC

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
APU Fuel Pressure Switch

3. Job Set-up
Subtask 28-22-15-941-050-A

A. Aircraft Maintenance Configuration
(1) When you do maintenance work on the fuel system you must obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW is in the off position (the ON legend is off).
(3) On the FUEL overhead panel 40VU, make sure that all L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(4) Put the WARNING NOTICE(S) in position:

on the overhead panel 25VU, to tell persons not to operate the APU MASTER SW,
on the FUEL panel 40VU, to tell persons not to operate the fuel system,
on the APU FIRE panel 20VU, to tell persons not to operate the fire extinguishing system.

Subtask 28-22-15-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	APU/FUEL/BLOW OFF/PUMP	2QC	B14
** ON A/C NOT FOR ALL
121VU	APU/FUEL/BLOW OFF/CTL	1QC	K39
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FUEL/PUMP/CTL	3QC	M38
** ON A/C NOT FOR ALL
121VU	APU/FUEL/BLOW OFF/CTL	1QC	P38

Subtask 28-22-15-010-050-A

C. Get Access
(1) Open the left MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position at the main landing-gear door.

4. Procedure
Subtask 28-22-15-020-051-A

A. Removal of the APU Fuel Pressure Switch (7QC)
(1) Disconnect the electrical connector (2) from the APU fuel pressure switch (1).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove and discard the lockwire from the plug (5) and from the check valve (3).
(4) Remove the plug (5) which attaches the APU fuel pressure switch (1) to the check valve (3).
(5) Remove the APU fuel pressure switch (1).
(6) Remove and discard the O-rings (4) from the banjo head (6).

[Rev.10 from 2021] 2026.04.02 06:17:31 UTC