D.
Procedure

 S 866-008
 (1)  
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-CLOSE tag.

 S 866-009

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 416-010
 (3)  
Open the APU access doors:

 (a)  
Open the latches on the APU access doors.

 (b)  
Open the APU access doors.

 (c)  
Engage the support rods for the APU access doors.

 (4)
Disconnect all the drain lines from their source components.

 S 036-012
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A
747-400
MAINTENANCE MANUAL

SEE  A 
SEE  B 
DIVERTER VALVE CONTROL DRAIN 
OUTLET DRIVE PAD OUTLET DRIVE PAD GENERATOR NO. 2 GENERATOR NO. 1 

A
APU Source Drain Locations
Figure 602 (Sheet 1)

F58214
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747-400 MAINTENANCE MANUAL
 (5)  S 496-013Put a 1 cup (250 cc) container below the drain outlet for each source component. (a) Make sure the containers will not move during the APU operation.
 (6)  S 866-014Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P6 Main Power Distribution Panel 1) 6K18 APU ALTN CONT (b) P83 Panel, E8 Aft Equipment Center 1) APU PRIMARY CONT
 (7)  S 866-015Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 panel.
 (8)  S 866-016Do this task:  "APU Starting and Operation" (Ref 49-11-00/201). 

GENERATOR NO. 1 DRIVE PAD OUTLET
IGV ACTUATOR OUTLET
COMBUSTION CHAMBER OUTLET
GENERATOR NO. 2 DRIVE PAD OUTLET
STARTER
PAD OUTLET

FUEL PUMP
PAD OUTLET

FLOW DIVIDER/ DUMP VALVE OUTLET
FUEL METERING UNIT OUTLET
B
APU Source Drain Locations Figure 602 (Sheet 2)
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747-400 MAINTENANCE MANUAL
 S 866-017
 (9)  
Let the engine operation become stable.

 S 976-018

 (10)
 Write down the length of time of the engine operation.

 S 866-019

 (11)
 Do this task: "APU Usual Shutdown" (Ref 49-11-00/201).

 NOTE: When you do the APU shutdown, fuel can come out the drain
____ outlet for the flow divider/dump valve. This is a permitted shutdown condition.
 S 866-020
 (12)
 Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 S 866-021

 (13)
 Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 096-022
 (14)
 Remove the containers below the drain outlets of the source components.

 S 976-024

 (15)
 Find the leakage rate for each source component:

 (a)  
Use the cylinder with graduations to measure the fluid quantity in each container.

 (b)  
Use the engine operation time and the fluid quantity to find the leakage rate for each component drain outlet.
　
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