Operational Test of the APU-Fuel Low-Pressure Circuit ((131-9(A))

TASK 49-31-00-710-003-A
Operational Test of the APU-Fuel Low-Pressure Circuit ((131-9(A))

ZONE: 210

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	STEPLADDER 2.0 M (6.6 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

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 31-60-00-860-001-A	EIS Start Procedure
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))

3. Job Set-up
Subtask 49-31-00-860-056-A ** ON A/C NOT FOR ALL

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 the R TK PUMPS pushbutton switches are released (the OFF legends are on).

Subtask 49-31-00-865-063-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FUEL/X FEED/VALVE/MOT1	2QE	A12
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 NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FUEL/LP VALVE/CTL	1QF	M40
121VU	APU/FUEL/LP VALVE/SPLY	2QF	M39
121VU	APU/FUEL/PUMP/CTL	3QC	M38
121VU	FUEL/X FEED/VALVE/MOT2	1QE	M24
121VU	FUEL/L WING TK/PUMP2 SPLY	7QA	N26
121VU	FUEL/L WING TK/PUMP1 SPLY	1QA	N23
121VU	FUEL/R WING TK/PUMP2 SPLY	8QA	Q26
121VU	FUEL/R WING TK/PUMP1 SPLY	2QA	Q23
** ON A/C NOT FOR ALL
121VU	APU/FUEL/BLOW OFF/CTL	1QC	P38

Subtask 49-31-00-010-058-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the LH main landing-gear (MLG) door (Ref. AMM TASK 32-12-00-010-001).
(2) Put the STEPLADDER 2.0 M (6.6 FT) in position at the LH MLG door.

4. Procedure
Subtask 49-31-00-710-057-A ** ON A/C NOT FOR ALL

A. Operational Test of the APU Fuel Low Pressure Circuit

NOTE: You can feel with your hand when the APU fuel pump operates.

ACTION	RESULT
1.On the ECAM control panel: push the APU pushbutton switch.	On the lower ECAM display unit: the APU page comes into view.
2.On the FUEL overhead panel 40VU: push 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.
3.Start and operate the APU (Ref. AMM TASK 49-00-00-860-008). NOTE: Operate the APU with no electric and/or pneumatic load.	At the APU fuel pump 4QC on the FR42/ZONE 140: the APU fuel pump is off.
4.On the FUEL overhead panel 40VU: release 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.
	At the APU fuel pump 4QC on the FR42/ZONE 140: the APU fuel pump operates.
5.On the circuit breaker panel 49VU: open the circuit breaker APU/FUEL/BLOW OFF/PUMP 2QC. On the circuit breaker panel 121VU: open the circuit breaker APU/FUEL/BLOW OFF/CTL 1QC.	At the APU fuel pump 4QC on the FR42/ZONE 140: the APU fuel pump stops.
	On the lower ECAM display unit: the FUEL LO PR message comes on (after a short time). NOTE: It is possible, that an APU AUTO SHUTDOWN occurs.
6.Do the APU shutdown (Ref. AMM TASK 49-00-00-860-009).	On the lower ECAM display unit: the FUEL LO PR message goes off. NOTE: The ECB (59KD) stores the fault message LOW FUEL PRESSURE CHECK APU FUEL SUPPLY (class 2).
7.On the circuit breaker panel 49VU: close the circuit breaker APU/FUEL/BLOW OFF/PUMP 2QC. On the circuit breaker panel 121VU: close the circuit breaker APU/FUEL/BLOW OFF/CTL 1QC.
8.On the APU section of the overhead panel 25VU: push the APU MASTER SW pushbutton switch to the on position.	On the APU section of the overhead panel 25VU: the ON legend in the APU MASTER SW comes on.
	At the APU fuel pump 4QC on the FR42/ZONE 140: the APU fuel pump operates.
9.On the APU section of the overhead panel 25VU: release the APU MASTER SW pushbutton switch to the off position.	On the APU section of the overhead panel 25VU: the ON legend in the APU MASTER SW goes off.
	At the APU fuel pump 4QC on the FR42/ZONE 140: the APU fuel pump stops.

5. Close-up
Subtask 49-31-00-410-058-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the stepladder from the LH MLG door.
(3) Close the LH MLG door. (Ref. AMM TASK 32-12-00-410-001)

Subtask 49-31-00-860-057-A ** ON A/C NOT FOR ALL

B. 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).

[Rev.10 from 2021] 2026.04.01 07:33:35 UTC