(5)
In the event of a fire in the APU, pulling the APU fire switch will close the APU fuel shutoff valve.
(6)
When the APU control switch is placed in OFF position, the APU fuel control relay is de-energized, causing the APU fuel shutoff valve to close. Power is also removed from the No. 2 and No. 3 aft main boost pump control relays and the No. 2 and No. 3 main tank boost pumps are turned off.
B.
Control
NOTE: For a more detailed description of the APU control system, refer
____
to AMM 49-61-00/001, APU Controls.
(1) Check that 28-volt dc power is available.
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MAINTENANCE MANUAL
E31605
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747-400
MAINTENANCE MANUAL
APU Fuel Feed System Flow Diagram
Figure 3
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747-400
MAINTENANCE MANUAL
(2)
To start, position APU control switch on the P5 pilots' overhead panel to ON.
(3)
To shut down, set the APU control switch to OFF.
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747-400 FAULT ISOLATION/MAINT MANUAL
APU FUEL-FEED SYSTEM
COMPONENT SHT FIG. 102 QTY ACCESS/AREA REFERENCE AMM
ACTUATOR - VALVE, APU FUEL SHUTOFF, V119 1 1 LEFT REAR SPAR TO LANDING GEAR 28-25-02
SUPPORT BEAM
ARRESTER - FLAME, APU FUEL SHROUD DRAIN 2,3 2 RIGHT BODY LANDING GEAR WELL 28-25-00
CARD - (FIM 28-22-00/101)
FUEL SYSTEM EICAS INTERFACE - MAIN, Y5BA14
FUEL SYSTEM EICAS INTERFACE - SLAVE, Y5BA15
VALVE POSITION LOGIC 4, Y5BA12
CIRCUIT BREAKER - FLT COMPT, P6
DC FUEL PUMP APU, C408 1 6H18 *
FUEL SHUTOFF VALVE APU, C406 1 6G5 *
DIODE - (FIM 30-01-36/101)
AFT BOOST PUMP 2, M226
DRAIN - APU FUEL SUPPLY LINE SHROUD 2,3 2 RIGHT BODY LANDING GEAR WELL 28-25-00
FILE - FUEL SYSTEM CARD, M7852 1 LEFT AREA BETWEEN NOSE GEAR WELL *
AND FUSELAGE
LINE - APU FUEL-FEED, FORWARD OF THE REAR 3 131AZ,131BZ,131CZ,131DZ,544AB, 28-25-04
SPAR LEFT CENTER SECTION WING BOX,
INBD MAIN TANK (PART), LEFT
MID SPAR TO REAR SPAR
LINE - APU FUEL-FEED, AFT OF THE REAR SPAR TO 3 146AZ,312A,315A, RIGHT WING 28-25-04
THE APU FIREWALL LANDING GEAR WELL, RIGHT AFT
CARGO CONTAINER COMPARTMENT,
RIGHT AREA AFT OF BULK CARGO
COMPARTMENT, RIGHT AREA AFT OF
PRESSURE BULKHEAD, RIGHT
STABILIZER TORSION BOX COMPART-
MENT, RIGHT AREA AFT OF
STABILIZER BOX COMPARTMENT
POPPET - PRIMARY, APU FUEL LINE SHROUD DRAIN 2 1 KEEL BEAM (PART) 28-25-07
VALVE
POPPET - SECONDARY, APU FUEL LINE SHROUD 1 RIGHT BODY LANDING GEAR WELL 28-25-08
DRAIN VALVE
PUMP - APU FUEL BOOST, M713 1,4 1 LEFT REAR SPAR TO LANDING GEAR 28-25-01
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