(8)
Oil System Contamination Inspection

 (9)
Volcanic Ash/Sand Ingestion Inspection/Check

 (10)
 Front Fan Case Rubstrip Inspection

 (11)
 Prepare for the Borescope Inspection

 (12)
 LPC 1st-Stage Vane and 1.6-Stage Blade Inspection

 (13)
 LPC 4th-Stage Blade and Vane Inspection

 (14)
 HPC Vane and Blade (5th- through 15th-Stage) Inspection

 (15)
 Combustion Chamber Inspection

 (16)
 HPT (1st and 2nd-Stage) Blade and (1st-Stage) Vane Inspection

 (17)
 LPT Vanes (3rd-Stage) - Inspection

 (18)
 LPT Blades (3rd-Stage) - Inspection

 (19)
 Put the Airplane Back to its Usual Condition

 B.  
These tasks give the instructions for the borescope inspections of the engine gaspath and for the unusual condition inspections.

 C.  
The engine gaspath inspections have borescope inspections through ten different access ports in the engine case. These access ports are from the 4th-stage low pressure compressor (LPC) thru the 3rd-stage of the low pressure turbine (LPT). There is also an optional port in the turbine vane cooling duct.

 D.  
To get access to the engine gaspath for the inspections, open the thrust reverser halves and look through the different access ports.

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 72-00-00
 ALL  ú ú N02 Page 601 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 2 - Inlet, Exhaust, and Externals Inspection
________________________________________________
 TASK 72-00-00-206-046-N00
 2. Inlet, Exhaust, and Externals Inspection
________________________________________
 A. General
 (1)  
This procedure gives you the general checks of the fan air path, turbine exhaust area, and the external components.

 B.
Standard Tools and Equipment

 (1)  
Light - White, Fluorescent

 (2)  
Mat - Protective, Rubber Manufacturer's Association, Grade SC43, neoprene sponge, 1 inch thick, 5 x 6 feet with warning streamers attached (three are necessary)

 C.
References

 (1)  
AMM 71-00-02/401, Power Plant

 (2)  
AMM 71-11-04/201, Fan Cowl Panels

 (3)  
AMM 71-11-06/201, Core Cowl Panels

 (4)  
AMM 72-31-01/601, Inlet Cone

 (5)  
AMM 72-31-02/601, 1st-Stage (Fan) Blade

 (6)  
AMM 72-31-03/601, Fan Exit Fairing

 (7)  
AMM 72-31-04/601, 1st-Stage Stator

 (8)  
AMM 72-31-05/601, 1.6th-Stage Blade

 (9)  
AMM 72-31-08/601, 1.6th-Stage Stator Rubstrip

 (10)
 AMM 72-33-01/601, Front Fan Case

 (11)
 AMM 72-33-02/601, Fan Exit Case and Vane

 (12)
 AMM 72-34-01/601, Fan Exit Liner Segments (Outer)

 (13)
 AMM 72-34-03/601, Fan Exit Liner Segments (Inner Rear)

 (14)
 AMM 72-34-04/601, Fan Exit (Bifurcation) Fairing

 (15)
 AMM 72-34-05/601, Compressor Intermediate Case Fairings

 (16)
 AMM 72-34-06/601, Fan Exit Liner Segments (Inner Front)

 (17)
 AMM 72-53-01/601, 6th-Stage LPT Blade

 (18)
 AMM 72-54-01/201, Turbine Exhaust Case

 (19)
 AMM 72-54-01/601, Turbine Exhaust Case

 (20)
 AMM 75-24-00/601, Turbine Cooling System

 (21)
 AMM 78-31-00/201, Thrust Reverser System

 D.
Access

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

 (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 Inlet, Exhaust, and Externals Inspection/Check.

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