Leak Test of the Fuel Recirculation Cooling-System

TASK 28-16-00-790-002-A
Leak Test of the Fuel Recirculation Cooling-System

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 470
ZONE: 480

1. Reason for the Job
To test for leaks in the fuel recirculation cooling-system when the ambient temperature is at 0 DEG.C (32.00 DEG.F) or higher.

NOTE: If the ambient temperature is below 0 DEG.C (32.00 DEG.F), use AMM task 71-00-00-860-825-A Motor the Engine (Wet Method) to do a check for leaks in the fuel system. Airbus recommends that you do this procedure for 30 seconds and use 120 seconds of the dry crank after the wet crank.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
98D27803500001	1	LOCKING TOOL ZERO POS

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
470	ENGINE 1 AFT PYLON
480	ENGINE 2 AFT PYLON
FOR [122QM] (CHECK VALVE-FUEL RECIRCULATION, L)
471BL
FOR [123QM] (CHECK VALVE-FUEL RECIRCULATION, R)
482BR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-16-42-000-001-A	Removal of the Fuel Recirculation Check-valve
TASK 28-16-42-400-001-A	Installation of the Fuel Recirculation Check-valve
TASK 54-53-11-000-804-A	Removal of the Pylon-to-Wing Access Panels and Doors
TASK 54-53-11-400-804-A	Installation of the Pylon-to-Wing Access Panels and Doors
TASK 71-00-00-720-811-A	Test No. 3A - Idle Power Test
Fuel Recirculation Check-Valve 122QM(123QM)

3. Job Set-up
Subtask 28-16-00-941-064-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) You must obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) On center pedestal panel 114VU:
(a) Make sure that the flap/slat control lever is in the zero position.
(b) Make sure that a 98D27803500001 LOCKING TOOL ZERO POS is installed on the slat/flap control lever.
(3) In the cockpit, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(4) On the throttle control lever, put the WARNING NOTICE(S) in position to tell persons not to operate the reverse system.
(5) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-16-00-865-062-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
FOR FIN: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
** ON A/C NOT FOR ALL
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	Q40
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41

Subtask 28-16-00-010-061-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable position in zone 520 (620).
(2) Remove the applicable access panels (Ref. AMM TASK 54-53-11-000-804):
(a) FOR [122QM] (CHECK VALVE-FUEL RECIRCULATION, L)
471BL.
(b) FOR [123QM] (CHECK VALVE-FUEL RECIRCULATION, R)
482BR.

4. Procedure
Subtask 28-16-00-790-061-A ** ON A/C NOT FOR ALL

A. Functional Test of the Fuel Recirculation Cooling-System
(1) Do a minimum idle check (Ref. AMM TASK 71-00-00-720-811).

NOTE: Airbus recommends that you do the idle check for a minimum of three minutes.

(2) Monitor the fuel pipe connections for fuel leaks:
(a) Make sure that there are no leaks.
(3) Monitor fuel recirculation check-valve 122QM (123QM) for fuel leaks:
(a) If there are signs of leakage, replace the check valve(s) (Ref. AMM TASK 28-16-42-000-001) and (Ref. AMM TASK 28-16-42-400-001).

5. Close-up
Subtask 28-16-00-410-060-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) Install the access panels (Ref. AMM TASK 54-53-11-400-804):
(a) FOR [122QM] (CHECK VALVE-FUEL RECIRCULATION, L)
471BL.
(b) FOR [123QM] (CHECK VALVE-FUEL RECIRCULATION, R)
482BR.

Subtask 28-16-00-942-059-A ** ON A/C NOT FOR ALL

B. Removal of Equipment
(1) Remove the SAFETY BARRIERS.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(4) On center pedestal panel 114VU:
(a) Remove the 98D27803500001 LOCKING TOOL ZERO POS from the slat/flap control lever.

[Rev.10 from 2021] 2026.04.01 07:27:13 UTC