*
AP-6 (HPC 12th and 13th stages)

*
AP-7 (HPC 14th and 15th stages)

*
AP-8 (combustion liner, fuel nozzles, and HPT 1st stage)

*
AP-10 (HPT 2nd stage and LPT 3rd stage vanes)

*
AP-11 (1st and 2nd stage HPT blades).

*
AP-12 (5th stage LPT vanes).

Training Information Point
When you inspect AP-1, you must use a flexible borescope and open the 2.5 bleed valve.
BEJ ALL POST SB 777-71-0032
You use a square drive tool to remove or install AP2 through AP-8. You use a puller tool to remove the plug at AP-10. You use a different puller tool to remove the plug at AP-11.
BEJ ALL
You use a square drive tool to remove or install AP2 through AP-8. You use a puller tool to remove the plug at AP-10 and AP-
12. You use a different puller tool to remove the plug at AP-11.
EFFECTIVITY BEJ ALL  72-00-00 
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D633W101-BEJ  Jan 05/2004 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

ENGINE -BORESCOPE ACCESS PORTS

EFFECTIVITY BEJ ALL POST SB 777-71-0032  72-00-00 
Page 23 
D633W101-BEJ  Jan 05/2004 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

ENGINE -BORESCOPE ACCESS PORTS

EFFECTIVITY BEJ ALL  72-00-00 
Page 24 
D633W101-BEJ  Sep 05/2003 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

72-00-00

Page 25 D633W101-BEJ Jan 05/2004

ENGINE -INTERMIX, INTERCHANGE, SUBSTITUTION

Engine Intermix, Interchange, Substitution
The engines can be intermixed, interchanged, substituted, derated or the takeoff thrust limit can be changed.
*
Engine intermix is the operation of the airplane with two different engine models installed. The takeoff thrust ratings should be the same.

*
Engine interchange is the replacement of an engine with another engine that is the same model with the same thrust setting.

*
Engine substitution is the removal both engines and the installation of two different engines that may not be the same model as the engines that were removed.

*
A derated engine is an engine that was modified to operate at a lower takeoff thrust rating than the thrust limit. The thrust limit is defined as the maximum sea level thrust level for a specific airplane model or engine model.

*
An engine that was derated to operate at a lower takeoff thrust rating can be changed to operate at a higher thrust rating. However, the takeoff thrust rating can not be more than the thrust limit.

On the 777, the basic engine models can be the Pratt and Whitney PW4084, the PW4090 and the PW4098. In general, the thrust limits are approximately 84,000 pounds of thrust for the PW4084, approximately 90,000 pounds of thrust for the PW4090 and approximately 98,000 pounds of thrust for the PW4098.
　
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