(4)  
Remove the protective mats from the inlet cowl.

 (5)
Remove the DO-NOT-OPERATE tags from the fuel control switches.

 S 096-117-N00
 S 866-118-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
No. 12 - Prepare for the Borescope Inspection
_____________________________________________
 TASK 72-00-00-846-119-N00
 12. Prepare for the Borescope Inspection
____________________________________
 A. General
 (1)  
This task gives the equipment and steps that are necessary to prepare for the borescope inspections.

 (2)  
Table 601 gives the number of blades in each of the gaspath stages

 for reference. ~............................................................................... | Table 601 | ................................................................................. | LPC | HPC | HPT | LPT | ................................................................................. | Stage -No. of | Stage -No. of | Stage -No. of | Stage -No. of | | Blades | Blades | Blades | Blades | ................................................................................. | 1.6 -94 | 5 -40 | 1 -60 | 3 -128 | | 2 -88 | 6 -51 | 2 -82 | 4 -130 | | 3 -72 | 7 -56 | | 5 -118 | | 4 -66 | 8 -53 | | *[1] | | | 9 -66 | | 6 -128 | | | 10 -62 | | | | | 11 -68 | | | | | 12 -72 | | | | | 13 -78 | | | | | 14 -76 | | | | | 15 -70 | | | 2...................…...................…...................…...................1 *[1] NEW ENGINES OR ENGINES POST-PWA-SB 72-256;
 There are 126 blades in stage No. 5.
 B. Standard Tools and Equipment
 (1)  Borescope Inspection Equipment - Specification CTE 6181, Support Equipment Engineering, Pratt & Whitney Commercial Products Division, 400 East Hartford, CT 06108, USA MS 11803
 NOTE: Specification CTE 6181 gives the equipment and related
____ hardware, such as the power source, light cables, adapter, that is necessary during borescope inspections. This specification sets the quality and functional standards for this equipment. This borescope equipment is recommended:
 Borescope Equipment  Access Ports
 Low magnification rigid borescope.. . . . . AP2-7, 9 (optional
 (0.270 inch/6.8 mm barrel dia max) for THRU FAN) High magnification rigid borescope. . . . . . AP8, 10, 11
 (0.444 inch/11.3 mm barrel dia max)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 12 - Prepare for the Borescope Inspection
_____________________________________________
 Flexible borescope . . . . . . . . . . . . AP-1, THRU FAN
 (0.270 inch/6.8 mm cable dia max) (optional for AP2-7)
 (2)  
Optional borescope equipment and sizes that make the operation of the borescope better and easier are also shown in CTE 6181. This equipment includes clamps that hold the borescope in position and optical video equipment. This video equipment helps you see and make a videotape record of the borescope procedure for a second, more full, examination.

 C.
Reference

 (1)  
AMM 71-11-04/201, Fan Cowl Panels

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

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 D.
Access

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

 (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

 E.
Prepare for the Borescope Inspection.

 S 866-188-N00
 (1)  
Get the applicable borescope equipment.
　
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