(2)
A test to make sure the center wing tank float valves are closed correctly.
(3)
A test to make sure the inboard main tank float valves are closed correctly.
B.
There are four float valves in the fuel scavenge system. There are two inlet float valves on the bottom of the center tank. These valves let fuel go from the center tank to the outlet float valves in each of the inboard main tanks. The outlet float valves, located near the top of the inboard main tanks, let fuel into the inboard main tanks when the fuel level is below the float valve.
C.
Each float valve can leak 10 to 25 lbs (5 to 12 kgs) of fuel per hour when the boost pumps are on and the center wing tank or inboard main tank float valves are closed. This quantity of fuel transfer is within the limits of the fuel scavenge system.
TASK 28-15-00-705-084
2. Operational Test - Fuel Scavenge System_______________________________________
A. References
(1)
AMM 12-11-01/301, Fuel Servicing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 28-15-00/201, Fuel Scavenge System
(4)
AMM 28-22-00/501, Fuel-Feed System
(5)
AMM 28-26-00/201, Defueling
(6)
AMM 28-41-00/501, Fuel Quantity Indicating System (FQIS)
(7)
AMM 31-61-00/501, Integrated Display System (IDS)
B.
Access
(1)
Location Zones
221 Control Cabin, Left
222 Control Cabin, Right
C.
Preconditions
S 865-085
(1)
The systems that follow must be installed and serviceable to complete this test:
(a)
A specified quantity of fuel is necessary for this procedure (AMM 12-11-01/301, or AMM 28-26-00/201).
(b)
Electrical Power (AMM 24-22-00/201)
(c)
Fuel Quantity Indicating System (FQIS) (AMM 28-41-00/501).
(d)
Integrated Display System (IDS) (AMM 31-61-00/501)
(e)
Fuel-Feed System (Fuel Boost Pumps and Crossfeed Valves) (AMM 28-22-00/501)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-15-00
ALL ú ú 01A Page 501 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(f)
Leading Edge Flaps (AMM 27-81-00/201)
D.
Prepare for the Test
S 865-086
(1)
Supply the electrical power (AMM 24-22-00/201).
(a)
Do not use the APU to supply power during this test.
S 865-087
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE AND TRAILING EDGE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
(2)
Make sure the leading edge flaps are in the fully retracted position (move the flaps if it is necessary) (AMM 27-81-00/201).
S 655-088
(3)
Make sure the fuel quantity in the center wing tank is between 1000 and 4000 lbs (500 and 1800 kgs) (AMM 12-11-01/301, AMM 28-26-00/201).
NOTE: This step opens the scavenge system float valves in the
____ center wing tank (at nominal ground attitude, 0.5 degree nose down, wings level).
S 655-122
(4)
Make sure the No. 2 and 3 main tanks contain this quanity of fuel: (AMM 12-11-01/301, AMM 28-26-00/201):
(a)
Maximum of 60,000 lbs (27,000 kgs)
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