Removal of the Fuel-Pump Check Valve

TASK 28-21-43-000-001-A
Removal of the Fuel-Pump Check Valve

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.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

ZONE: 540
ZONE: 640
FIN: 33QM ** ON A/C NOT FOR ALL
FIN: 34QM ** ON A/C NOT FOR ALL
FIN: 35QM ** ON A/C NOT FOR ALL
FIN: 36QM ** ON A/C NOT FOR ALL

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 3M (10 FT)- ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
98D57004014000	1	HOOK-COVER (RIB2-SURGE DOORS)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540	FUEL TANK
640	FUEL TANK
540AB, 640AB
FOR [33QM] (CHECK VALVE-FUEL PUMP,L WING TK OUTR)
FOR [34QM] (CHECK VALVE-FUEL PUMP, L WING TK INR)
540AB, 540BZ
FOR [35QM] (CHECK VALVE-FUEL PUMP, R WING TK INR)
FOR [36QM] (CHECK VALVE-FUEL PUMP, R WING TK OUTR)
640AB, 640BZ

C. Referenced Information

REFERENCE	DESIGNATION
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 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 57-27-11-000-001-A	Removal of the Access Panel
Fuel-Pump Check-Valve 33QM(36QM), 34QM(35QM)
FOR [33QM] (CHECK VALVE-FUEL PUMP,L WING TK OUTR)
FOR [34QM] (CHECK VALVE-FUEL PUMP, L WING TK INR)
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-12-000-002-A	Removal of the Rib 2 Access Panel 540AZ(640AZ) or 540BZ(640BZ)
FOR [35QM] (CHECK VALVE-FUEL PUMP, R WING TK INR)
FOR [36QM] (CHECK VALVE-FUEL PUMP, R WING TK OUTR)
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-12-000-002-A	Removal of the Rib 2 Access Panel 540AZ(640AZ) or 540BZ(640BZ)

3. Job Set-up
Subtask 28-21-43-941-054-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the fuel safety procedures (Ref. AMM TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-21-43-650-050-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Defuel the applicable fuel tank (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 28-21-43-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
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
123VU	L WING TK/PUMP 1/STBY SPLY	11QA	AD12
123VU	R WING TK/PUMP 1/STBY SPLY	12QA	AE12

Subtask 28-21-43-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable access panel 540AB(640AB).
(2) Remove the wing access panel (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-000-001):
(a) FOR [33QM] (CHECK VALVE-FUEL PUMP,L WING TK OUTR), [34QM] (CHECK VALVE-FUEL PUMP, L WING TK INR)
remove 540AB
(b) FOR [35QM] (CHECK VALVE-FUEL PUMP, R WING TK INR), [36QM] (CHECK VALVE-FUEL PUMP, R WING TK OUTR)
remove 640AB
(3) Open the applicable RIB2 surge door:
(a) FOR [33QM] (CHECK VALVE-FUEL PUMP,L WING TK OUTR), [34QM] (CHECK VALVE-FUEL PUMP, L WING TK INR)
open 540BZ
(b) FOR [35QM] (CHECK VALVE-FUEL PUMP, R WING TK INR), [36QM] (CHECK VALVE-FUEL PUMP, R WING TK OUTR)
open 640BZ
(4) Install the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS)

Subtask 28-21-43-010-050-G ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the applicable access panels 540AB ( 640AB).
(2) Remove the applicable access panels that follow:
(a) FOR [33QM] (CHECK VALVE-FUEL PUMP,L WING TK OUTR), [34QM] (CHECK VALVE-FUEL PUMP, L WING TK INR)
Remove 540AB (Ref. AMM TASK 28-10-00-910-002) and (Ref. AMM TASK 57-27-11-000-001).
(b) FOR [35QM] (CHECK VALVE-FUEL PUMP, R WING TK INR), [36QM] (CHECK VALVE-FUEL PUMP, R WING TK OUTR)
Remove 640AB (Ref. AMM TASK 28-10-00-910-002) and (Ref. AMM TASK 57-27-11-000-001).
(3) Remove the applicable RIB2 access panels that follow:
(a) FOR [33QM] (CHECK VALVE-FUEL PUMP,L WING TK OUTR), [34QM] (CHECK VALVE-FUEL PUMP, L WING TK INR)
Remove 540BZ (Ref. AMM TASK 57-27-12-000-002).
(b) FOR [35QM] (CHECK VALVE-FUEL PUMP, R WING TK INR), [36QM] (CHECK VALVE-FUEL PUMP, R WING TK OUTR)
Remove 640BZ (Ref. AMM TASK 57-27-12-000-002).

4. Procedure
Subtask 28-21-43-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Fuel-Pump Check-Valve 33QM (36QM), 34QM (35QM)
(1) Loosen the nut of the pipe (3).
(2) Disconnect the pipe (3) from the check valve (2).
(3) Remove the check valve (2) from the manifold.
(4) Remove and discard the O-ring (1).
(5) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.02 06:17:25 UTC