3. Job Set-up
__________ (Ref. Fig. 402/TASK 28-21-53-991-002) Subtask 28-21-53-941-056
A. Safety Precautions WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
(1)
You must obey the fuel safety procedures (Ref. TASK 28-10-00-910-001) when you do work in a fuel tank.
(2)
Put the safety barriers in position.
(3)
Put a warning notice on the applicable panel 195BB(196BB) to tell persons not to operate the MLG doors.
Subtask 28-21-53-650-058
B. Aircraft Maintenance Configuration
(1)
Defuel the center fuel tank (Ref. TASK 28-25-00-650-001).
(2)
Drain the remaining fuel from the center fuel tank (Ref. TASK 28-25-00-650-003).
Subtask 28-21-53-865-063
C. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU FUEL/CTR TK/PUMP2 SPLY 30QA P26 121VU FUEL/CTR TK/PUMP1 SPLY 29QA P23
Subtask 28-21-53-010-052
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. TASK 32-12-00-010-001).
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Jet Pump - Center Tank
Figure 402/TASK 28-21-53-991-002
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(2)
Make sure that the GROUND LOCK SLEEVE is installed on the applicable MLG door actuating-cylinder.
(3)
Put the access platform below the applicable access panel 147AZ(148AZ).
(4)
Remove the applicable access panel (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-17-11-000-001):
-FOR 89QM
remove 147AZ
FOR 90QM
remove 148AZ.
4. Procedure
_________
(Ref. Fig. 402/TASK 28-21-53-991-002) Subtask 28-21-53-020-052
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 blanking caps on the disconnected coupling nuts (31), (45), (49) and (51), the elbow (50), the tee piece (32) and the union (44).
(9)
Remove and discard the lockwire from the end plug (38).
(10) Remove the nuts (36) and the jet pump (42).
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