Removal of the Check Valve

TASK 28-16-42-000-002-A
Removal of the 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.

FIN: 222QM ** ON A/C NOT FOR ALL
FIN: 223QM ** ON A/C NOT FOR ALL
FIN: 224QM ** ON A/C NOT FOR ALL
FIN: 225QM ** 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
FOR [222QM] (CHECK VALVE)
FOR [224QM] (CHECK VALVE)
540AB, 540BZ
FOR [223QM] (CHECK VALVE)
FOR [225QM] (CHECK VALVE)
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
Check Valve - Location and Detail
FOR [222QM] (CHECK VALVE)
FOR [224QM] (CHECK VALVE)
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 [223QM] (CHECK VALVE)
FOR [225QM] (CHECK VALVE)
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 28-16-42-941-055-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 when you do work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-16-42-860-052-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 28-16-42-865-053-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 28-16-42-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable zone 540(640).
(2) Remove the applicable wing access panel (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002):
(a) FOR [222QM] (CHECK VALVE), [224QM] (CHECK VALVE)
remove 540AB
(b) FOR [223QM] (CHECK VALVE), [225QM] (CHECK VALVE)
remove 640AB
(3) Open the applicable rib 2 surge door and install the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS):
(a) FOR [222QM] (CHECK VALVE), [224QM] (CHECK VALVE)
open 540BZ
(b) FOR [223QM] (CHECK VALVE), [225QM] (CHECK VALVE)
open 640BZ

Subtask 28-16-42-010-051-C ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the applicable zone 540 (640).
(2) Remove the applicable access panels that follow:
(a) FOR [222QM] (CHECK VALVE), [224QM] (CHECK VALVE)
Remove 540AB (Ref. AMM TASK 28-10-00-910-002) and (Ref. AMM TASK 57-27-11-000-001).
(b) FOR [223QM] (CHECK VALVE), [225QM] (CHECK VALVE)
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 [222QM] (CHECK VALVE), [224QM] (CHECK VALVE)
Remove 540BZ (Ref. AMM TASK 57-27-12-000-002).
(b) FOR [223QM] (CHECK VALVE), [225QM] (CHECK VALVE)
Remove 640BZ (Ref. AMM TASK 57-27-12-000-002).

4. Procedure
Subtask 28-16-42-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Check Valve 222QM(223QM), 224QM(225QM)
(1) Disconnect the pipe (3) at the check-valve (2).
(2) Remove the check-valve (2).
(3) Put the PLUG-BLANKING in each disconnected line end.
(4) Remove and discard the O-ring (1).

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