Removal of the APU Fuel Low-Pressure Valve

TASK 28-29-41-000-001-A
Removal of the APU Fuel Low-Pressure Valve

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

ZONE: 141
FIN: 14QM

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 2M (6 FT) - ADJUSTABLE
No specific	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	2	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
98A28007570000	1	ADAPTER - VENT AND DRAIN VALVE, APU

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
141	WING CENTER BOX
147AZ, 315AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-29-51-000-001-A	Removal of the APU Fuel LP Valve Actuator
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
APU Fuel LP-Valve

3. Job Set-up
Subtask 28-29-41-861-050-A

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 28-29-41-650-050-A

B. Defuel the center tank (Ref. AMM TASK 28-25-00-650-001).

Subtask 28-29-41-865-050-A

C. 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/FUEL/LP VALVE/CTL	1QF	M40
121VU	APU/FUEL/PUMP/CTL	3QC	M38
** ON A/C NOT FOR ALL
121VU	APU/FUEL/BLOW OFF/CTL	1QC	P38

Subtask 28-29-41-010-052-A

D. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position below the APU compartment.
(2) Open the access door 315AL.

Subtask 28-29-41-480-050-A

E. Installation of the Adapter
(1) Remove the blanking plug from the APU fuel vent and drain valve.
(2) Install the 98A28007570000 ADAPTER - VENT AND DRAIN VALVE, APU.
(3) Put a CONTAINER 10 L(2 1/2 USGAL) below the APU fuel vent and drain valve to collect the fuel.

Subtask 28-29-41-650-051-A

F. On the front firewall FR80 at the tail cone:
(1) Push and hold the VENT APU FUEL LINE pushbutton switch (8QC).
(2) When the flow of the fuel stops (2 liters), release the VENT APU FUEL LINE pushbutton switch (8QC).

Subtask 28-29-41-080-050-A

G. Removal of the Adapter
(1) Remove the container.
(2) Remove the 98A28007570000 ADAPTER - VENT AND DRAIN VALVE, APU.
(3) Install the blanking plug on the APU fuel vent and drain valve.

Subtask 28-29-41-862-050-A

H. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 28-29-41-010-050-A

I. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position under the main door of the left main gear.
(2) Open the main door of the left main gear (Ref. AMM TASK 32-12-00-010-001).
(3) Remove the manhole cover 147AZ (Ref. AMM TASK 57-17-11-000-001).
(4) Remove the APU fuel LP valve actuator 3QF (Ref. AMM TASK 28-29-51-000-001).

Subtask 28-29-41-910-050-A

J. You must obey the special fuel safety procedures when you work in the fuel tank (Ref. AMM TASK 28-10-00-910-001) and (Ref. AMM TASK 28-10-00-910-002).

4. Procedure
Subtask 28-29-41-020-050-A

A. Removal of the APU Fuel-LP Valve
(1) Put the CONTAINER 10 L(2 1/2 USGAL) below the valve (18).
(2) Remove the nut (6), the screw (13) and disconnect the bonding straps (11) and (12).
(3) Remove the screws (5) and the washers (4).
(4) Remove and discard the O-ring (2).
(5) Loosen and remove the coupling nut (8).
(6) Remove the line (3) from the pump (1) and the line (10) from the valve (18).
(7) Remove the circlips (7) from the coupling nut (8).
(8) Remove the nut (26), the bolt (24), the washer (25) and disconnect the bonding straps (9) and (21).
(9) Remove the nuts (19).
(10) Disconnect the line (20) from the valve (18).

NOTE: Play at the connections between the lines (20), (22) and (23) will help you release the line (20).

(11) Remove the screws (14) and the washers (15).
(12) Remove the valve (18) from the rear spar (16).
(13) Remove and discard the O-rings (17), (27) and (28).
(14) Put the PLUG - BLANKING on the disconnected pump (1) end and on the disconnected lines (20), (10) and (3) ends.

[Rev.10 from 2021] 2026.04.02 06:18:02 UTC