(b)  
Put the retaining ring on the ferrule.

 (c)  
Install the ferrule in the tubing ferrule.

 (d)  
Install the nut on the tubing ferrule.

 S 434-074
 (3)  
To install the couplings to connect the APU fuel drain line at the pressure bulkhead (View D, Fig. 405), forward of the wheel well, do the steps that follow:

 (a)  
Install the ferrules on the APU fuel drain lines.

 (b)  
Apply thread lubricant on the thread of the tubing ferrule.

 (c)  
Put the coupling nut on the ferrule.

 (d)  
Install the retaining ring on the ferrule between the coupling nut and the flange of the ferrule which connects with the body.

 (e)  
Install the O-ring in the groove of the body.

 (f)  
Install the coupling on the body.

 (g)  
Install the lockwire on the coupling.

 S 434-075
 (4)  Install the nut on the union out and above the center fuel tank to connect the APU fuel drain line (View A, Fig. 405).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-25-05
 ALL  ú ú 03 Page 421 ú Sep 28/01

A
757 MAINTENANCE MANUAL
 S 434-114
 (5)  
Install the applicable fittings on the APU fuel drain line per the Install the Fittings on the Fuel Line procedure.

 S 794-140

 (6)
Do this task: Leakage Test of the APU Fuel Line and Shroud.

 S 414-076

 (7)  
Install the floor panels (AMM 53-01-01/401).

 TASK 28-25-05-794-139
 10. Leakage Test of the APU Fuel Line and Shroud____________________________________________
 A. General
 (1)  
Do this test to make sure there is no leakage after you install a section of the APU fuel line.

 B.
References

 (1)  
AMM 12-11-04/301, APU Fuel Line Shroud Draining

 (2)  
AMM 24-22-00/201, Manual Control

 C.
Access

 (1)  
Location Zones 133 Wing Center Section (Left) 134 Wing Center Section (Right) 241 Passenger Cabin - Section 44 (Left) 242 Passenger Cabin - Section 44 (Right) 251 Passenger Cabin - Section 46 (Left) 252 Passenger Cabin - Section 46 (Right) 311 Area Aft of Pressure Bulkhead to BS 1787.45 (Left) 312 Area Aft of Pressure Bulkhead to BS 1787.45 (Right) 313 Stabilizer Center Section Compartment (Left) 314 Stabilizer Center Section Compartment (Right) 315 APU Compartment (Left) 316 APU Compartment (Right) 531 Center Wing Tank (Left) 541 Main Tank - Rib No. 5 to No. 17 (Left)
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 4(47)