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 ALL  ú ú N01 Page 686E ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 18 - LPT Vanes (3rd-Stage) Inspection
_________________________________________
 (b)  Use a PWA 86081 Puller to remove, as an assembly, the plug, the plug stop, the spring washer, and the cotter pin. Discard the gasket.
 NOTE: Do not remove the cotter pin.
____
 S 296-168-N00
 WARNING: DO NOT USE THE POWER CABLE OF THE BORESCOPE IF YOU FIND
_______ CIRCUMFERENTIAL CUT HOLES, FRAYING, OR BROKEN HOLES IN THE EXTERNAL RUBBER COVERING ON THE CABLE. POWER CABLES WITH THOSE CONDITIONS CAN CAUSE INJURY TO PERSONS.
 CAUTION: MAKE SURE THE TEMPERATURE OF THE INSPECTION AREAS ARE BELOW
_______ 150°F (65.6°C) BEFORE YOU USE THE BORESCOPE. IF THE CASES ADJACENT TO THE INSPECTION AREAS ARE TOO HOT TO KEEP YOUR HAND ON, YOU CAN CAUSE DAMAGE TO THE BORESCOPE.
 (3)  Put the borescope through the access port to examine the 3rd-stage LPT vanes for nicks, dents, cracks, and other FOD.
 S 226-169-N00
 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 THE MAXIMUM CONTINUE-IN-SERVICE LIMITS.
 CAUTION: IF YOU FIND DAMAGE THAT IS WORSE THAN THE CONTINUE-IN-SERVICE
_______ LIMITS, OR PIECES OF THE VANE WILL FALL OFF, REMOVE THE ENGINE IMMEDIATELY. THIS TYPE OF DAMAGE CAN CAUSE MORE DAMAGE TO THE ENGINE IF IT IS NOT REPAIRED.
 (4)  
Compare the damage you find with the continue-in-service limits that follow (Fig. 625).

 (a)  
In area A, dents, or moved metal that is not more than 0.030
 inch (0.762 mm) in depth is permitted.

 (b)  
No cracks are permitted in area A.

 (c)  
No damage is permitted in area B.

 (d)  
In area C, dents that are not more than 0.0230 inch (0.508 mm) in depth are permitted.

 (e)  
No cracks are permitted in area C.

 (f)  
If the damage is not more than the limits, then the airplane
 can continue to operate.

 

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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 ALL  ú ú N02 Page 686F ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
No. 18 - LPT Vanes (3rd-Stage) Inspection
_________________________________________
 (g)  
If there has been a sudden increase in EGT, check for a
 possible missing or liberated LPT 3rd-stage outer transition
 duct segment.

 (h)  
No missing or liberated outer transition duct segments are
 permitted.

 

 S 416-170-N00
 (5)  Install the access port AP-10 (Fig. 623):
 NOTE: If you will do an inspection of the LPT 3rd-stage blades, do
____
 not install the access port AP-10.

 (a)  If the access port AP-10 is disassembled, assemble it for the installation.
 NOTE: The plug assembly is not usually disassembled.
____
 1)  When you install the spring tension washer in the cover recess, make sure these conditions occur: the outer diameter of the washer touches the cover, and the concave surface of the washer is adjacent to the cover.
 2) From the washer side, put the plug in the assembled washer and cover. 3) Push the cotter pin in the plug until the cotter pin head is tightly against the flat side of the plug.
 (b)  With the split side to the inner side, install the plug with a new AP-10 gasket (PWA ST1146-08).
 NOTE: The plug will be in the case boss and the spring washer
____
 will push the plug to the inner side.

 (c)  
Attach the plug stop cover to the plug (AP-10).

 (d)  
Fully clean the bolt threads and the plug threads with
 petroleum solvent.

 

 NOTE: This removes unwanted carbon and all used antigalling
____
 compound.

 (e)  
Apply a layer of Silver Goop to the threads of the bolts and
 remove the unwanted compound.
　
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