Operational Check of APU Low Pressure Fuel Valve for evidence of internal Leakage with left Wing Tank Pump on

TASK 28-29-00-710-002-A
Operational Check of APU Low Pressure Fuel Valve for evidence of internal Leakage with left Wing Tank Pump on

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Reason for the Job
Refer to the MPD TASK: 282900-02
OPERATIONAL CHECK OF APU LP FUEL VALVE FOR EVIDENCE OF INTERNAL LEAKAGE WITH LEFT WING TANK PUMP ON
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)
No specific	AR	CONTAINER 5 L (1.32 USGAL)
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
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 28-29-41-000-001-A	Removal of the APU Fuel Low-Pressure Valve
TASK 28-29-41-400-001-A	Installation of the APU Fuel Low-Pressure-Valve
TASK 31-60-00-860-001-A	EIS Start Procedure
Adapter for Vent and Drain Valve

3. Job Set-up
Subtask 28-29-00-860-052-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(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) On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW pushbutton switch is in the off position (the ON legend is off).

Subtask 28-29-00-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/FUEL/LP VALVE/CTL	1QF	M40
121VU	APU/FUEL/LP VALVE/SPLY	2QF	M39

Subtask 28-29-00-865-056-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	FUEL/L WING TK/PUMP1 SPLY	1QA	N23
121VU	FUEL/PUMPS/1/L CTL AND R IND	3QA	R23

Subtask 28-29-00-010-050-A

D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) below the APU compartment.
(2) Open the APU access door 315AL.
(3) Remove the blanking plug (2) from the vent and drain valve (1).
(4) Install the 98A28007570000 ADAPTER - VENT AND DRAIN VALVE, APU (3) on the vent and drain valve (1).
(5) Put a CONTAINER 5 L (1.32 USGAL) below the APU vent and drain valve to collect the unwanted fuel.

4. Procedure
Subtask 28-29-00-710-052-A ** ON A/C NOT FOR ALL

A. Check of the APU LP Fuel Valve for evidence of internal Leakage with the left Wing Tank Pump on

ACTION	RESULT
1.On the ECAM control panel: push the FUEL pushbutton switch.	On the lower ECAM display unit: the FUEL page comes into view. the APU LP fuel valve position symbol is in the horizontal position.
2.On the FUEL overhead panel 40VU: push the the L TK PUMPS 1 pushbutton switch.	On the FUEL overhead panel 40VU: the OFF legend in the L TK PUMPS 1 pushbutton switch goes off, the FAULT legend in the L TK PUMPS 1 pushbutton switch stays off. NOTE: If the FAULT legend in the L TK PUMPS 1 pushbutton switch comes on, then the pump does not operate.
	At the APU vent and drain valve: make sure that no fuel comes out of the vent and drain valve. NOTE: No flow of fuel is permitted. That shows that the APU fuel LP valve has no internal leakage. If fuel comes out of the vent and drain valve replace the APU fuel LP valve (Ref. AMM TASK 28-29-41-000-001) and (Ref. AMM TASK 28-29-41-400-001).
3.On the FUEL overhead panel 40VU: release the the L TK PUMPS 1 pushbutton switch.	On the FUEL overhead panel 40VU: the OFF legend in the L TK PUMPS 1 pushbutton switch comes on.

Subtask 28-29-00-710-052-B ** ON A/C NOT FOR ALL

A. Check of the APU LP Fuel Valve for evidence of internal Leakage with the left Wing Tank Pump on

ACTION	RESULT
1.On the ECAM control panel: push the FUEL pushbutton switch.	On the system display unit: the FUEL page comes into view. make sure that the triangle symbol for the APU fuel valve position is displayed in white.
2.On the FUEL overhead panel 40VU: push the the L TK PUMPS 1 pushbutton switch.	On the FUEL overhead panel 40VU: the OFF legend in the L TK PUMPS 1 pushbutton switch goes off, the FAULT legend in the L TK PUMPS 1 pushbutton switch stays off. NOTE: If the FAULT legend in the L TK PUMPS 1 pushbutton switch comes on, then the pump does not operate.
	At the APU vent and drain valve: make sure that no fuel comes out of the vent and drain valve. NOTE: No flow of fuel is permitted. That shows that the APU fuel LP valve has no internal leakage. If fuel comes out of the vent and drain valve replace the APU fuel LP valve (Ref. AMM TASK 28-29-41-000-001) and (Ref. AMM TASK 28-29-41-400-001).
3.On the FUEL overhead panel 40VU: release the the L TK PUMPS 1 pushbutton switch.	On the FUEL overhead panel 40VU: the OFF legend in the L TK PUMPS 1 pushbutton switch comes on.

5. Close-up
Subtask 28-29-00-860-053-A

A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(2) De-energize the aircraft electrical circuits. (Ref. AMM TASK 24-41-00-862-002)

Subtask 28-29-00-410-050-A

B. Close Access
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Remove the 98A28007570000 ADAPTER - VENT AND DRAIN VALVE, APU (3) from the vent and drain valve (1).
(3) Install the blanking plug (2) on the vent and drain valve (1).
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Close the APU access door 315AL.
(6) Remove the access platform(s).
(7) Put the system back to the serviceable condition.

Subtask 28-29-00-865-055-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/FUEL/LP VALVE/CTL	1QF	M40
121VU	APU/FUEL/LP VALVE/SPLY	2QF	M39

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