Installation of the Jet Pump

TASK 28-21-53-400-002-A
Installation of the Jet Pump

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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 2M (6 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
43	O-RING	AIPC 28-21-05-02-010
47	O-RING	AIPC 28-21-05-02-010
35	O-RINGS	AIPC 28-21-05-03-020
37	O-RING	AIPC 28-21-05-03-030
34	O-RING	AIPC 28-21-05-04-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 28-25-00-869-001-A	Fuel Transfer
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 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-400-001-A	Installation of Access Cover 147AZ(148AZ)
Jet Pump - Center Tank

3. Job Set-up
Subtask 28-21-53-941-059-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) Make sure that the SAFETY BARRIER(S) are in position.
(3) Make sure that the WARNING NOTICE(S) is on the applicable panel 195BB (196BB) to tell persons not to operate the MLG doors.

Subtask 28-21-53-860-053-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the center tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the center tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the applicable MLG door 734(744) is open (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuating-cylinder.
(5) Make sure that the ACCESS PLATFORM 2M (6 FT) is below the applicable access panel 147AZ(148AZ).
(6) Make sure that the applicable access panel is removed (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)
access panel 147AZ
(b) FOR [90QM] (JET PUMP-WATER SCAVENGE, R CTR TK)
access panel 148AZ.

Subtask 28-21-53-865-054-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

4. Procedure
Subtask 28-21-53-420-055-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent areas with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9)
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the new items that follow with Turbine Fuel-- Kerosene - (Material No.01ABA1) , or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) :

Subtask 28-21-53-420-051-A ** ON A/C NOT FOR ALL

B. Installation 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 blanking caps from the:

jet pump (42)
coupling nuts (31), (45), (49) and (51)
union (44)
elbow (50)
tee piece (32).

(2) Install the O-ring (43) on the union (44).
(3) Install the nut (48) on the elbow (50) and install the nut (33) on the tee piece (32).
(4) Install the O-ring (47) on the elbow (50) and the O-ring (34) on the tee piece (32).
(5) Install the union (44), the elbow (50) and the tee piece (32) on the jet pump (42).
(6) Install the O-rings (35) and the O-ring (37) on the jet pump (42).
(7) Attach the jet pump (42) to the rear spar and install the nuts (36).

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.

(8) Safety the end plug (38) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(9) Connect the coupling nuts (31) and (51) to the tee piece (32).
(10) Connect the coupling nut (49) to the elbow (50) and the coupling nut (45) to the union (44).
(11) Tighten the nuts (48) and (33).
(12) Install the bonding lead (41), the washer (40), the bolt (39) and the nut (46) on the jet pump (42).

Subtask 28-21-53-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable access panel (Ref. AMM TASK 57-17-11-400-001):

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

Subtask 28-21-53-865-055-A ** ON A/C NOT FOR ALL

D. Remove the safety clip(s) and the tag(s) and close 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 28-21-53-650-055-A ** ON A/C NOT FOR ALL

E. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-21-53-790-051-A ** ON A/C NOT FOR ALL

F. Leak Test
(1) Examine the rear spar and jet pump (40) interface for signs of fuel leakage.

5. Close-up
Subtask 28-21-53-410-052-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 access platform(s).
(3) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-21-53-942-051-A ** ON A/C NOT FOR ALL

B. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

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