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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
6TH-STAGE LPT BLADES
SEE A
SEE B
A CASE STRUT TURBINE EXHAUST
A 1
SEGMENT ASSEMBLY AIRSEALING RING 6TH-STAGE LPT (OUTER) A SEAL SEGMENT HONEYCOMB NORMAL NORMAL WEAR DAMAGE NEXT TO GROOVE GROOVE WEAR WEAR GROOVE DAMAGE NEXT TO NORMAL
B A-A 0988 L-A4927
6th-Stage LPT (Outer) Airsealing Ring Segment Assembly Inspection
Figure 601
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(b) If it is necessary to remove the airsealing ring, remove the engine.
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(3) Install the turbine exhaust plug (AMM 78-11-02/401).
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LPT BORESCOPE (AP10) - REPAIR
_____________________________
TASK 72-53-04-428-001-N00
1. Reposition LPT Outer Transition Duct Heatshield________________________________________________
A. General
(1)
This task supplies instructions for the repositioning or reoperation of the LPT Outer Transition Duct Heatshield. If the heatshield is ground, it will cause damage to the heatshield which will require repair or replacement at overhaul.
B.
Procedure
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(1)
If necessary, remove the AP-10 borescope plug (AMM 72-00-00/601).
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(2)
Visually examine the LPT access port AP-10 to make sure that the outer transition duct heatshield is in the correct position.
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(3)
If the outer transition duct heatshield is not in the correct position and has moved into the plane of the borescope hole or path of the borescope plug put the heatshield in the correct position as follows:
(a)
Put a small diameter drift or bar into the borescope port to the depth of the heatshield.
(b)
Carefully move the heatshield into the correct position with the outer transition duct segment borescope hole.
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(4) If you are unable to move the heatshield into the correct position do the steps that follow. If the heatshield moves as in Fig. 803, install the AP-10 borescope plug (AMM 72-00-00/601).
NOTE: This reoperation will make larger the outer transition
____ duct heatshield borescope hole and or part of the outer transition duct segment borescope hole. This will make necessary repair or possible replacement of these parts at the next overhaul. Small quantities of grinding chips removed from the outer transition heatshield may enter into the engine space. This will not cause damage to engine operation or the gaspath and non-gaspath parts. A heatshield hole made larger will not have unwanted effect on the heatshield or outer transition duct function, other engine parts, or engine operation.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
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(5) Visually examine the LPT access port AP-10 to find the transition duct heatshield that blocks the installation of the borescope plug.
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CAUTION: DO NOT REMOVE MATERIAL FROM THE OUTER TRANSITION DUCT SEGMENT
_______ HOLE, THIS MAY CUASE THE SEGMENT TO BE SCRAPPED AT THE NEXT OVERHAUL.
(6) Remove material from the transition duct heatshield as follows:
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