28-25-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SHROUD DRAIN VALVE
SEE A
APU SHROUD DRAIN LINE
VALVE DRAIN SHROUD A VALVE DRAIN SHROUD
A
FWD SHROUD DRAIN VALVE A INBD A-A
Figure 601 APU Shroud Drain Valve
M48838
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-25-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
E. Procedure
S 796-078
(1) Use the sump drain tool MIT65BB00772, to push open this valve SHROUD DRAIN APU FUEL (View A-A).
NOTE: The SHROUD DRAIN APU FUEL drain valve is located on
____ the fuselage skin between the wheel well doors for the body landing gear.
S 796-054
(2)
Hold the drain valve open until you remove all of the fluid.
S 796-055
(3)
Discard any collected fuel.
S 796-056
(4)
Do a fuel leak check at the drain valve.
S 796-057
(5)
Monitor the fuel leakage rate for five minutes.
S 796-058
(6)
If the fuel leakage rate is more than one drop per minute, then there is a fuel leak.
(a)
Do this task to find out if the fuel leak is within allowable fuel leakage limits: 1) Fuel Leak Check of the APU Fuel-Feed Line
S 796-059
(7)
If the fuel leakage rate is not more than one drop per minute, then the APU fuel-feed line is satisfactory.
F.
Put the Airplane Back to the Usual Condition
S 086-060
WARNING:_______OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Remove the door locks (AMM 32-00-30/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TASK 28-25-00-306-081
3. Fuel Leak Check of the APU Fuel-Feed Line_________________________________________
A. General
(1)
Do this task if you find a fuel leak at the APU shroud drain valve.
(2)
This procedure pressurizes the APU fuel-feed line for 30 minutes to find out if the fuel leakage rate is within allowable limits.
B.
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 12-11-01/301, Fuel Servicing
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 28-25-04/401, APU Fuel Feed Line
(5)
AMM 28-26-00/201, Defuel
(6)
AMM 32-00-30/201, Landing Gear Door Locks
(7)
AMM 49-11-00/201, Auxiliary Power Unit
C.
Equipment
(1)
Container - applicable container for fuel
D.
Access
(1)
Location Zone
149 Keel Beam
E.
Prepare for the Procedure
S 866-062
(1)
Supply electrical power (AMM 24-22-00/201).
S 866-063
(2)
Make sure the No. 2 and No. 3 main tanks contain a minimum of 2500 lbs (1200 kgs) of fuel.
S 656-064
(3)
Add or transfer fuel if it is necessary (AMM 12-11-01/301) (AMM 28-26-00/201).
S 486-065
WARNING: MAKE SURE THAT THE GROUND LOCKS ARE INSTALLED IN ALL OF THE
_______ LANDING GEAR. WITHOUT THE GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(4) Make sure the ground locks are installed in the nose and main gear (AMM 09-11-00/201).
S 486-066
WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
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