28-25-01
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757
MAINTENANCE MANUAL
(2)
AMM 24-22-00/201, Electrical Power Control
(3)
AMM 28-25-03/401, APU Fuel Pump Pressure Switch
(4)
AMM 32-00-15/201, Landing Gear Door Locks
C.
Access
(1)
Location Zones
133 Wing Center Section (Left)
134 Wing Center Section (Right)
D.
Procedure
S 424-029
(1)
Align the motor impeller of the APU DC fuel pump (3) with the housing of the APU DC fuel pump (5) on the rear spar out of the fuel tank.
S 434-030
(2)
Put the pins (12) into the retainers (2).
S 434-031
(3)
Install the retainers (2) and pins (12) in the motor impeller (3).
S 434-045
(4)
Attach the bonding jumper (11) to the lower retainer (2).
S 434-046
(5)
Put washers (16) on the retainer bolts (15).
S 434-032
(6)
Install the retainer bolts (15) and washers (16) in the retainers (2).
S 224-047
(7)
Make sure the bonding resistance between the retainer (2) and the APU DC fuel pump is not more than 0.002 ohm (AMM 20-10-21/601).
S 434-048
(8)
Connect the electrical connector (4) to the motor impeller of the APU DC fuel pump (3).
S 434-049
(9)
Install the pressure switch of the APU DC fuel pump (10)
(AMM 28-25-03/401).
(10)
Supply electrical power (AMM 24-22-00/201).
S 864-033
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28-25-01
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757 MAINTENANCE MANUAL
S 714-050
CAUTION: DO NOT OPERATE THE APU DC FUEL PUMP FOR MORE THAN 30 SECONDS.
_______ IF YOU OPERATE THE APU DC FUEL PUMP FOR A LONG TIME, DAMAGE TO THE PUMP WILL OCCUR.
(11)
Do the steps that follow to do a test of the APU DC fuel pump:
(a)
Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag: 1) 6H23, L FWD FUEL BOOST PUMP
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