Subtask 28-21-54-420-051
B. Installation of the Fuel Pump Strainer
(1)
Put the strainer (15) in position on the bracket (10) and install the bolts (9).
(2)
Install a new O-ring (2) on the fuel pipe (1).
(3)
Install the nut (4) and the retaining ring (3) on the fuel pipe (1).
(4)
Install the filter connector (5) on the strainer (15) with the bolts (6).
(5)
Install the fuel pipe (1) in the filter connector (5). Tighten the nut (4) onto the filter connector (5) to keep the fuel pipe (1) in position.
(6)
Position the cowls (12) and (7) on the bracket (10) and install the three bolts (13).
(7)
Install the two bolts (8).
(8)
Position the bonding tab (11) on the cowl (12) and install the bolt
(14) (Ref. TASK 20-28-00-912-002).
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(9) Apply SEALANTS (Material No. 09-001) to the bolts (6), (8), (9) and (13).
5. Close-up
________
Subtask 28-21-54-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Remove the applicable tool HOOK-COVER (RIB 2 SURGE DOORS) (98D57004013000) or HOOK-COVER (RIB2-SURGE DOORS) (98D57004014000).
(3)
Close the applicable fuel-surge access door 540AZ, 640AZ, 540BZ, 640BZ.
(4)
Install the applicable access panel 540AB, 640AB (Ref. TASK 28-10-00-910-002) (Ref. TASK 57-27-11-400-001).
Subtask 28-21-54-865-051
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit
breaker(s): R 1QA, 2QA, 7QA, 8QA, 11QA, 12QA.
Subtask 28-21-54-650-051
C. Fuel Configuration
(1) Refuel, defuel or transfer fuel as applicable (Ref. TASK 12-11-28-650-003), (Ref. TASK 28-25-00-650-001) or (Ref. TASK 28-25-00-869-001).
Subtask 28-21-54-942-050
D. Removal of Equipment
(1)
Remove the safety barriers.
(2)
Remove the warning notice(s).
(3)
Remove the access platform(s).
(4)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
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APU FUEL PUMP SYSTEM - DESCRIPTION AND OPERATION
________________________________________________
1.
General
_______ The APU fuel pump system supplies the necessary fuel to operate the APU in all operation conditions. The APU fuel supply is tapped from the engine feed line. The fuel pressure for the APU comes from either the engine fuel pumps or the APU fuel pump. To prevent draining the cross feed line when you remove the APU fuel pump, the pump is mounted in a cannister.
2.
Component Location
__________________
(Ref. Fig. 001)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
(Ref. Fig. 002)
R **ON A/C 106-149, 211-299, 301-399, 401-499,
(Ref. Fig. 002A)
**ON A/C ALL
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------4QC PUMP-APU FUEL 147 734 28-22-51 7QC PRESS SWITCH-APU FUEL PRESSURE 147 734 28-22-15 8QC SWITCH-FUEL VENT 315 315AL 28-22-00 9QM CANISTER - APU FUEL PUMP 147 734 28-22-52
5030QM SWITCH-APU FUEL LP, INLET 315 315AL 28-22-14 5040QM VALVE-VENT AND DRAIN 315 315AL 28-22-14
3. System Description
__________________ (Ref. Fig. 003) The APU usually takes its fuel supply from the LH engine-feed line, but when the cross-feed valve is open, the RH engine-feed line can also supply the APU with fuel. Normally, the necessary fuel pressure is achieved by the main-engine fuel pumps. The fuel pressure is monitored by the APU fuel-pressure switch 7QC. If the fuel pressure in the APU fuel line drops below 1.5 bar (22 PSI), the APU fuel pressure switch energizes the APU fuel pump to ensure a stable fuel supply to the APU.
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R APU Fuel - FWD Fuselage - Component Location Figure 001
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R APU Fuel - Aft Fuselage - Component Location Figure 002
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R APU Fuel - Aft Fuselage - Component Location Figure 002A
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