Removal of the Jet Pump

TASK 28-21-53-000-002-A
Removal of the Jet Pump

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: 89QM ** ON A/C NOT FOR ALL
FIN: 90QM ** 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	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [89QM] (JET PUMP-WATER SCAVENGE, L CTR TK)
147AZ
FOR [90QM] (JET PUMP-WATER SCAVENGE, R CTR TK)
148AZ

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 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
Jet Pump - Center Tank

3. Job Set-up
Subtask 28-21-53-941-056-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.
(3) Put a WARNING NOTICE(S) on the applicable panel 195BB(196BB) to tell persons not to operate the MLG doors.

Subtask 28-21-53-650-058-A ** ON A/C NOT FOR ALL

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

Subtask 28-21-53-865-063-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/CTR TK/PUMP2 SPLY	30QA	P26
121VU	FUEL/CTR TK/PUMP1 SPLY	29QA	P23

Subtask 28-21-53-010-052-A ** ON A/C NOT FOR ALL

D. Get Access

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.

(1) Open the applicable MLG door 734(744) (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuating-cylinder.
(3) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable access panel 147AZ(148AZ).
(4) Remove the applicable access panel (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002):

(a) FOR [89QM] (JET PUMP-WATER SCAVENGE, L CTR TK)
remove 147AZ
(b) FOR [90QM] (JET PUMP-WATER SCAVENGE, R CTR TK)
remove 148AZ.

4. Procedure
Subtask 28-21-53-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Jet Pump 89QM(90QM)

CAUTION: YOU MUST USE TWO WRENCHES AND HOLD THE COMPONENT WHEN YOU REMOVE/INSTALL THE PIPE COUPLINGS AND/OR UNIONS. THIS PREVENTS DAMAGE TO THE COMPONENT.

(1) Remove the nut (46), the bolt (39) and the washer (40) and disconnect the bonding lead (41) from the jet pump (42).
(2) Disconnect the coupling nuts (31), (45), (49) and (51).
(3) Loosen the nut (33) and remove the tee piece (32).
(4) Remove and discard the O-ring (34).
(5) Loosen the nut (48) and remove the elbow (50).
(6) Remove and discard the O-ring (47).
(7) Remove the union (44) and remove and discard the O-ring (43).
(8) Put CAP - BLANKING on the disconnected coupling nuts (31), (45), (49) and (51), the elbow (50), the tee piece (32) and the union (44).

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(9) Remove and discard the lockwire from the end plug (38).
(10) Remove the nuts (36) and the jet pump (42).
(11) Remove and discard the O-rings (35) and the O-ring (37).
(12) Install blanking caps on the jet pump (42).

[Rev.10 from 2021] 2026.04.02 06:17:29 UTC