S 434-026
(14)
Install the actuator of the APU fuel shutoff valve (2) (AMM 28-25-11/401).
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757
MAINTENANCE MANUAL
APU FUEL PUMP PRESSURE SWITCH - REMOVAL/INSTALLATION
____________________________________________________
1. General
_______
A. The pressure switch of the APU DC fuel pump is installed on the rear spar of the center fuel tank. The pressure switch is found approximately 3 feet to the left of the body centerline. It provides a ground for the Engine Indicating and Crew Alerting System (EICAS) for a pressure in the pump greater than 4 psi. A DC FUEL PUMP ON maintenance message results from the pressure in the pump. This message is available for recall on the lower EICAS display screen on the ground.
B. This procedure contains two tasks. The first task removes the pressure switch of the APU DC fuel pump. The second task installs the pressure switch of the APU DC fuel pump.
TASK 28-25-03-024-014
2. Remove the Pressure Switch of the APU DC Fuel Pump (Fig. 401)
__________________________________________________
A. Equipment
(1)
Container - for fuel
B.
References
(1)
AMM 32-00-15/201, Landing Gear Door Locks
(2)
AMM 32-00-20/201, Landing Gear Downlocks
C.
Access
(1)
Location Zones
133 Wing Center Section (Left)
134 Wing Center Section (Right)
D.
Procedure
S 864-001
(1)
Open this circuit breaker on the overhead circuit breaker panel, P11, and attach a DO-NOT-CLOSE tag:
(a)
11C33, FUEL DC PUMP PWR
S 214-008
(2) Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
S 494-009
WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
(4)
Disconnect the electrical connector from the pressure switch.
S 034-002
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