B.  This procedure uses a rigid tube borescope with an attached power rotary diamond ball and rotary kratex. The power rotary diamond ball blends the blades that are damaged. The rotary kratex removes the burrs and polishes the blades that were damaged. A video monitor is necessary to see both the blades and the repair of the blades that are damaged. Some video monitors have a video micrometer to measure the damage, location, and depth of the repair.
 TASK 72-35-02-328-006-N00
 2.  Stage 5, 6, And 7 Rotor Blades - Repairs
________________________________________
 A.  References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

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

 (3)  
AMM 72-00-00/601, Engine Gaspath

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

 B.  
Equipment

 (1)  
PWA 49057 Kit, Blending - 5th, 6th, and 7th Stage HPC Blades (Borescope Access)

 (2)  
PWA 49117 Kit, Video System - 5th, 6th, and 7th Stage HPC Blades (Machida) (alternative to PWA 101045) PWA 101045 Kit, Video System - 5th, 6th, and 7th Stage HPC Blades (Olympus) (alternative to PWA 49117)

 C.  
Access

 (1)  
Location Zones
 412 Engine No. 1
 422 Engine No. 2
 432 Engine No. 3
 442 Engine No. 4

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(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

 D.
Prepare for the Repair of the Stage 5, 6, and 7 Rotor Blades

 S 048-002-N00
 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 018-003-N00

 (2)  
Open the right fan cowl panel (AMM 71-11-04/201).

 S 018-004-N00

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

 S 018-005-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the right thrust reverser (AMM 78-31-00/201).

 S 018-006-N00

 (5)  
Remove the plugs from the borescope ports AP-2 and AP-3
 (AMM 72-00-00/601).

 S 488-007-N00

 (6)  
Set up the PWA Video System Kit 49117 (alternative) or PWA Video System Kit 101045 (alternative) (Fig. 802).

 S 488-008-N00

 (7)  
Set up the PWA Blending Kit 49057 (Fig. 802).

 E.
Repair the Stage 5, 6, and 7 Rotor Blades (Fig. 801 and 802)

 S 998-013-N00
 (1)  Find the applicable service limits and blend limits for the blades in Table 801.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.

TYPICAL BLADE

Borescope Inspection/Repair Limits For Foreign Object Damage (Stages 5, 6 and 7) Figure 801
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