(a)
6E3, FUEL VALVES APU

 S 215-038
 (30)
 Make sure the EICAS advisory message, APU FUEL VAL, does not show on the top display.

 S 095-039

 (31)
 Remove the jumper wire from the sockets B2 and B3 of the electrical connector (D2378).

 (32)
 Install the APU fuel-control relay (K175) in the E6 rack.

 S 435-040
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-25-00
 ALL  ú ú 01 Page 507 ú May 28/01

A

757 MAINTENANCE MANUAL
 S 915-041
 WARNING:_______REFER TO AMM 32-00-15/201 FOR DOOR LOCK REMOVAL PROCEDURE. THE MAIN GEAR DOORS CAN MOVE QUICKLY AND CAUSE INJURY OR DAMAGE.
 (33)
 Remove the main gear door locks and close the main gear doors (AMM 32-00-15/201).

 S 865-042

 (34)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 28-25-00-735-043
 3.  System Test - APU Shroud and Drain Tubing (Fig. 503)_________________________________________
 A. General
 (1)  
This procedure does a pressure decay check of the APU fuel line shroud.

 B.
Equipment

 (1)  
Leak Test Adapter, A28005-53

 (2)  
Hose assembly A28005-50

 (3)  
Pneumatic Air Supply, That can supply 20 psig
 pressure - Commercially Available

 C.
References

 (1)  
AMM 06-42-00/201, Empennage and Section 48 Access Doors and Panels

 (2)  
AMM 28-25-05/401, APU Fuel Line and Shroud

 D.
Access

 (1)  
Location Zones
 316 APU Compartment (Right)

 (2)  
Access Panels
 316AR APU Access Door (Right)

 E.
Test the APU Shroud

 S 215-044
 (1)  
Make sure the APU master control switch on the overhead panel, P5, is in the OFF position.

 (2)
Attach a DO-NOT-OPERATE tag to the APU master control switch.

 S 015-046

 (3)  
Open the right APU access door, 316AR, and find the APU shroud drain line (AMM 06-42-00/201).

 S 865-045
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-25-00
 ALL  ú ú 01 Page 508 ú Jan 28/01
　
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