(a)  
Do a visual check of the EGT bus bars:
 1) Make sure the bus bars are not damaged.
 2) Make sure no metal parts touch the bus bars.
 3) Make sure the bus bars do not touch each other.

 (b)  
Disengage the support rods for the APU access doors.

 (c)  
Put the support rods in the clips on the inner side of the APU access doors.

 (d)  
Make sure the insulation covers correctly attach to the APU compartment firewall.

 (e)  
Close the APU access doors.

 (f)  
Close the latches on the APU access doors.

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747-400 MAINTENANCE MANUAL
 APU FUEL FILTER BYPASS INDICATOR - ADJUSTMENT/TEST
__________________________________________________
 1.  General_______
 A.  This procedure contains the task to do a test of the bypass indicator for the APU fuel filter.
 B.  The bypass indicator for the fuel filter is on the bottom of the APU fuel pump. You can get access to the bypass indicator for the fuel filter through the APU access doors.
 C.  You can use fuel pressure or air pressure to test the bypass indicator.
 TASK 49-31-05-725-001
 2.  APU Fuel Filter Bypass Indicator Test (Fig. 501)_____________________________________
 A.  Equipment
 (1)  100-50461 - Test Fixture: Argo-Tech Corporation Customer Support Operations 204 Hindry Avenue Inglewood, California 90301-1520
 (310) 670-4020
 (2)
Air - Compressed Dry Filtered, 0-40 psi (0-276 kPa)

 (3)
Fuel Supply - 0-30 psi (0-210 kPa)

 (4)
Container - 5 gallon (20 liter) capacity used to collect the fuel

 (5)
Gauge - Pressure, 0-40 psi (0-276 kPa) range

 (6)
Valve - Shutoff

 (7)
Valve - Vent

 B.  
References

 (1)
WDM 49-11-11

 (2)
SSM 49-11-01

 (3)
IPC 49-31-03

 (4)
AMM 24-22-00/201, Electrical Power

 (5)
AMM 31-61-00/501, Integrated Display System (IDS)

 (6)
AMM 45-10-00/501, Central Maintenance Computer (CMC)

 (7)
AMM 49-11-00/201, Auxiliary Power Unit

 (8)
AMM 49-31-05/401, APU Fuel Filter Bypass Indicator

 C.  
Access

 (1)  
Location Zone 317 APU Compartment-Bottom of the APU Fuel Pump, LH 318 APU Compartment-Bottom of the APU Fuel Pump, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

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A

747-400
MAINTENANCE MANUAL

SEE A
FUEL PUMP
FWD
TEST FIXTURE
PACKING
FILTER BYPASS INDICATOR
ELECTRICALCONNECTOR P3
A
Filter Bypass Indicator Test Figure 501
F58326
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A
747-400
MAINTENANCE MANUAL

 D. Preconditions
 S 865-010
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical Power On (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS), serviceable
 (AMM 31-61-00/501).

 (c)  
Central Maintenance Computer, serviceable
 (AMM 45-10-00/501).

 E.
Procedure
　
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