(a)  
Remove all loose pieces from the corners of the platform you will repair.

 (b)  
Clean the repair area with alcohol.

 (c)  
Fully dry the repair area in air that is at ambient temperature until there is no remaining alcohol on the part.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

L-7897
Fan Exit Case and Vane Repair
(Installation of Replacement Lockwire and Nuts)
Figure 803

D20350
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S 398-079-N00
 (3)  
Repair the area as follows.

 (a)  
Apply sealant to the repair area.

 (b)  
Make the contour of the repair area agree with the contour of the adjacent surfaces.

 (c)  
Cure the sealant as follows: 1) In air at ambient temperature, 2) In air that has a relative humidity of not less than 20%, 3) For a minimum of two hours, 4) Until it is not tacky.

 F.
Put the Airplane Back to Its Usual Condition

 S 418-080-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Close the thrust reversers (AMM 78-31-00/201).

 S 418-081-N00

 (2)  
Close the fan cowl panels (AMM 71-11-04/201).

 S 418-082-N00

 (3)  
Close the core cowl panels (AMM 71-11-06/201).

 S 448-083-N00

 (4)  
Do the activation procedure for the thrust reversers (AMM 78-31-00/201).

 TASK 72-33-02-308-084-N00
 6. Repair Damaged Corners on the B1 and B2 Flanges on the Fan Exit Case
____________________________________________________________________
 A. References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 72-33-02/601, Fan Exit Case and Vane

 (4)  
AMM 78-31-00/201, Thrust Reverser System

 B.
Access

 (1)  
Location Zone
 412 Engine 1 - Fan Exit Case
 422 Engine 2 - Fan Exit Case
 432 Engine 3 - Fan Exit Case
 442 Engine 4 - Fan Exit Case

 (2)  
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
C.  Prepare for Repair of the Fan Exit Case Flanges S 418-085-N00
 (1)  Open the fan cowl panels (AMM 71-11-04/201).
 S 048-086-N00 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSERS. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURY TO YOU AND DAMAGE TO EQUIPMENT.
 (2)  
Do the Deactivation Procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 018-087-N00

 (3)  
Open the core cowl panels (AMM 71-11-06/201).

 S 018-088-N00 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURY TO YOU AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
　
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