49-16-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
APU DRAINS AND VENTS - INSPECTION/CHECK
_______________________________________
1. General
_______
A. This procedure contains two tasks. The first task does an inspection of the drain system for the APU engine. The inspection makes sure the quantity of fluid which comes out the fuselage drain outlets is in the permitted limits.
B. The second task isolates the source component when the leakage comes from a drain line which has more than one component connected to it.
C. The five fuselage drain outlets examined in this task are as follows:
(1)
The Combustion Chamber
(2)
The Starter and Generator Drive Pads
(3)
The Fuel System
(4)
The Fuel Line Shroud
(5)
The Fuel Pump Pad.
D.
There are four fuel components that drain into the drain outlet for the fuel system. These components are as follows:
(1)
The Fuel Metering Unit (FMU)
(2)
The IGV Actuator
(3)
The Diverter Valve Control
(4)
The Flow Divider/Dump Valve.
E.
Measure the leakage by how many drops of fluid drain out each minute during the usual APU operation. The inspection task contains the leakage limits for each component drain outlet. The repair steps for too much leakage are also given for each component drain outlet.
F.
You can get access to the five fuselage drain outlets on the outer side of the fuselage. The outlets are in the area forward and to the right side of the APU access doors. You can get access to the component drain outlets through the APU access doors.
TASK 49-16-00-206-001
2. APU Drain Inspection (Fig. 601 and 602)
____________________
A. Standard Tools and Equipment
(1)
Container - 1 U.S. Gallon (4 Liter) capacity, for fuel and oil
B.
References
(1)
28-25-00/601, APU Fuel Feed System
(2)
49-11-00/201, Auxiliary Power Unit
(3)
49-27-02/401, Accessory Gearbox Mainshaft Oil Seal
(4)
49-27-05/401, AC Generator Drive Oil Seal
(5)
49-27-06/401, Fuel Pump Drive Spur Gearshaft Oil Seal
(6)
49-31-00/201, APU Engine Fuel System
(7)
49-31-01/401, Fuel Metering Unit
(8)
49-52-03/401, Inlet Guide Vane Actuator
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL
SEE A
SKIN
DRAIN MAST
FUEL PUMP PAD DRAIN
STARTER/GENERATOR DRIVE PAD DRAIN (FUEL METERING UNIT (FMU),
FWD IGV ACTUATOR, DIVERTER VALVE CONTROL AND FLOW DIVIDER AND DUMP VALVE DRAIN)
A
APU Drain Inspection
Figure 601 (Sheet 1)
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49-16-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
COMPONENT LIQUID PERMITTED LEAKAGE CORRECT THE LEAKAGE PROCEDURE TO
FUEL METERING FUEL NONE REPLACE THE FMU
UNIT (FMU) (AMM 49-31-01/401)
FLOW DIVIDER AND FUEL DURING APU OPERATION: REPLACE THE FLOW DIVIDER AND
DUMP VALVE NONE DUMP VALVE (AMM 49-31-00/201)
AFTER APU USUAL SHUTDOWN:
112 CC IN A THREE MINUTE PERIOD
IGV ACTUATOR FUEL NONE REPLACE THE IGV ACTUATOR
(AMM 49-52-03/401)
DIVERTER VALVE FUEL NONE REPLACE THE DIVERTER VALVE
CONTROL CONTROL (AMM 49-52-06/401)
FUEL PUMP DRIVE PAD FUEL 45.0 CC/HR (18 DROPS/MINUTE) REPLACE THE FUEL PUMP
(AMM 49-31-03/401)
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