(10)
Set the APU master control switch to OFF. S 862-015
(11)
Attach a DO-NOT-OPERATE tag to the APU master control switch. S 432-010
(12)
Connect and tighten the fuel line connector. S 412-011
(13)
Disengage the door support rods and close the APU access doors. S 862-012
(14)
Remove the DO-NOT-OPERATE tag from the APU master control switch. S 862-013
(15)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
APU FUEL FEED SYSTEM - ADJUSTMENT/TEST
______________________________________
TASK 28-25-00-715-010
1. APU Fuel-Feed System Operational Test_____________________________________
A. General
(1)
This procedure contains an operational test of the APU fuel-feed system. The operational test makes sure that these APU system components and APU system controls operate correctly:
(a)
APU DC fuel pump
(b)
APU fuel shutoff valve
(c)
Aft boost pumps for the No. 2 and No. 3 main tanks operate during APU operation
(d)
APU fire handle and remote shutdown switch operate correctly to control the APU shutoff valve.
(2)
When the APU is operated, the No. 2 and No. 3 main tanks must contain a minimum of 2800 lbs (1270 kgs) of fuel. This is to permit a continuous operation of the APU for approximately one hour.
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 28-22-00/501, Fuel Feed
(3)
AMM 28-22-16/401, Fuel System Card File
(4)
AMM 28-26-00/201, Defueling
(5)
AMM 31-61-00/501, Integrated Display Systems (IDS)
(6)
AMM 32-00-30/201, Landing Gear Door Locks
(7)
AMM 32-09-02/201, Air/Ground Relays
(8)
AMM 34-61-02/401, Control Display Unit
(9)
AMM 45-10-00/501, Central Maintenance Computer (CMC)
(10)
AMM 49-11-00/501, Auxiliary Power Unit
C.
Access
(1)
Location Zones 221 Control Cabin, Left 222 Control Cabin, Right 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 571 Rear Spar to Landing Gear Support Beam, Left
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A
747-400 MAINTENANCE MANUAL
D. Preconditions
S 865-371
(1)
These conditions are necessary for this task:
(a)
APU Fuel-Feed System serviceable.
(b)
A specific fuel quantity is necessary for this task (AMM 12-11-01/301 and AMM 28-26-00/201).
(c)
Electrical Power On (AMM 24-22-00/201).
(d)
Fuel Feed System serviceable (AMM/28-22-00/501).
(e)
Fuel System Card File serviceable (AMM 28-22-16/401).
(f)
Integrated Display System (IDS) serviceable (AMM 31-61-00/501).
(g)
Airplane must be in the ground mode (AMM 32-09-02/201).
(h)
CDU installed (AMM 34-61-02/401).
(i)
Central Maintenance Computer (CMC) serviceable (AMM 45-10-00/201).
(j)
APU System serviceable (AMM 49-11-00/501).
E.
Prepare for the Operational Test
S 495-005
WARNING: DO THE PROCEDURE IN AMM 32-00-30/201 TO INSTALL THE DOOR LOCKS.
_______ THE DOORS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Install the wing and body gear door locks (AMM 32-00-30/201)
S 865-002
(2)
Make sure these circuit breakers are closed:
(a) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 燃油 FUEL 3(87)
