S 416-152-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
No. 16 - Combustion Chamber Inspection
______________________________________
 TASK 72-00-00-206-193-N00
 16. Combustion Chamber Inspection
_____________________________
 A. General
 (1)  This inspection is the visual check of the Combustion Chamber: the inner and outer combustion chamber assemblies, the bulkhead, and the heatshield of the fuel injector guide.
 CAUTION: USE CAUTION WHEN YOU USE THIS PROCEDURE TO MAKE A DECISION
_______ ABOUT THE CONDITION OF THE ENGINE. THE BORESCOPE INSPECTION LIMITS ARE A RESULT OF TESTS AND STRUCTURAL ANALYSIS. THE PART LIFE AND THE PERFORMANCE OF THE ENGINE CAN DECREASE QUICKLY WHILE THE DAMAGE OF THE PARTS BECOMES NEAR TO THE MAXIMUM CONTINUE-IN-SERVICE LIMITS.
 (2)  
The limits given in this section will help you find if the engine can continue to operate or if you must remove and repair it.

 B.
Consumable Materials

 (1)  
D00137 Engine Oil - PWA 521B

 (2)  
D00244 Antiseize compound, high temperature - Silver Goop

 C.
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

 D.
Do the Combustion Chamber Inspection

 S 846-153-N00
 (1)  
Do this task: Prepare for the Borescope Inspection.

 S 016-154-N00

 (2)  
Remove the plugs from the AP-8 access ports of the combustion chamber (Refer to Fig. 608 and Fig. 614 for access port locations and borescope data).

 NOTE: Six AP-8 plugs are on the diffuser case at 45, 128, 172,
____ 225, 277, and 338 degrees clockwise from top center of engine when you look forward.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
ACCESS PORT AP-8 (45`) SEE B-B
A
CC
SEE A
AIR SHUTOFF VALVES
FOR TURBINE CASE
COOLING (TCC)

FWD
A
ACCESS PORT AP-9 (93`)
DIFFUSER CASE A
AP-8 (338`)
AP-8 (45`)  COMBUSTION CHAMBER
SEE F
AP-8 (277`) SEE E
GASKET
B
AP-8 (225`) AP-8 (128`)
SEE D SEE B
B
AP-8 PLUG
AP-8 (172`)
(EXAMPLE)
SEE C (6 LOCATIONS)
AP-8 LOCATIONS A-A B-B
L-A3338
Combustion Chamber Access Port Locations Figure 614 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
BORESCOPE PATH AP-9 PLUG WASHER
COMBUSTION 
CHAMBER 
1ST-STAGE 
HPT BLADE 
1ST-STAGE 
L-A1726  HPT VANE  C-C 
IGNITER PLUG 
(REF) 
ACCESS PORT 
AP-8 (128`) 
START VALVE  SEE B-B 
(REF)  HYDRAULIC 
PUMP (REF) 
FWD 
STARTER  B 
(REF) 
ACCESS PORT 
AP-8 (172`) 
SEE B-B 
FWD 
C 
Combustion Chamber Access Port Locations 
Figure 614 (Sheet 2) 

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