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 28-22-07
 ALL  ú ú 01B Page 446 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 28-22-07-404-081
 7.  Fuel Line in the Engine Strut - Coupling O-ring Installation____________________________________________________________
 A. General
 (1)  
This task is for digital task card requirements.

 (2)  
This task installs the coupling O-rings and retaining rings to the fuel line in the engine strut area.

 B.
Equipment

 (1)  
Bonding Meter (AMM 20-22-01/601)

 C.
Consumable Materials

 (1)  
D00128 Petrolatum, VV-P-236

 D.
References

 (1)  
AMM 28-00-00/201, Fuel System

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

 (3)  
AMM 28-22-07/601, Engine Fuel Feed System Fuel Line

 (4)  
AMM 27-81-00/201, Leading Edge Flaps

 (5)  
AMM 54-53-00/201, Strut Drains and Sealant

 (6)  
AMM 54-62-00/201, Nacelle Strut Access Panels (Opening and Closing)

 (7)  
AMM 71-00-00/201, Power Plant

 (8)  
AMM 71-00-00/501, Power Plant

 (9)  
AMM 71-11-06/201, Core Cowl Panels

 (10)
 AMM 73-11-01/401, Fuel Pump

 (11)
 AMM 78-31-00/201, Thrust Reverser System

 (12)
 AIPC 28-22-07 FIG. 1

 (13)
 AIPC 28-22-07 FIG. 2

 (14)
 AIPC 28-22-07 FIG. 15

 (15)
 AIPC 28-22-07 FIG. 16

 (16)
 SWPM 20-20-00, Electrical Bond and Ground

 E.
Access

 (1)  
Location Zones 452 Nacelle Strut 1 - Torque Box 521 Nacelle Strut 1 - Leading Edge to Front Spar 462 Nacelle Strut 2 - Torque Box 521 Nacelle Strut 2 - Leading Edge to Front Spar 472 Nacelle Strut 3 - Torque Box 621 Nacelle Strut 3 - Leading Edge to Front Spar 482 Nacelle Strut 4 - Torque Box 621 Nacelle Strut 4 - Leading Edge to Front Spar

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-07
 ALL  ú ú 01B Page 447 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
Access Panels
 415 Thrust Reverser Half - Engine 1
 416 Thrust Reverser Half - Engine 1
 521FT Wing Leading Edge Cover - Nacelle Strut 1
 425 Thrust Reverser Half - Engine 2
 426 Thrust Reverser Half - Engine 2
 521CT Wing Leading Edge Cover - Nacelle Strut 2
 435 Thrust Reverser Half - Engine 3
 436 Thrust Reverser Half - Engine 3
 611CT Wing Leading Edge Cover - Nacelle Strut 3
 445 Thrust Reverser Half - Engine 4
 446 Thrust Reverser Half - Engine 4
 621FT Wing Leading Edge Cover - Nacelle Strut 4

 F.  
Install the Coupling O-Rings and Retaining Rings to the Fuel Line in the Engine Strut Area (Fig. 405)

 S 434-082
 CAUTION:_______DO NOT USE ANY TOOLS TO TIGHTEN THE FUEL LINE FITTINGS. DAMAGE TO THE FITTING COMPONENTS OR LOOSENING OF THE ADJACENT FITTINGS CAN OCCUR.
 (1)  
Do these steps to inspect the installation of the fuel couplings:

 (a)  
Make sure the O-rings are new and are not contaminated or damaged.

 (b)  
Make sure the O-rings are lubricated with petrolatum before the installation.

 (c)  
Make sure the retaining rings are new and are not deformed or bent.

 (d)  
Make sure all of the coupling components are installed and in the correct sequence.

 (e)  
Make sure the coupling is manually tightened.

 (f)  
Make sure the coupling is tightened as far as possible by hand.

 (g)  
For flexible full couplings and shrouded couplings, make sure the minimum and maximum dimensions are correct (AMM 28-00-00/201).

 S 424-100
 (2)  
　
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