CFM CFM56-2 - HPT Nozzle Possible Defects

EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
HIGH PRESSURE
TURBINE
BORESCOPE
INSPECTION
Page 134
Sep 03
HIGH PRESSURE TURBINE (HPT)
(ALL) :
Possible defects.
Whenever the HPT nozzle is inspected, the following
defects should be assessed with the AMM serviceability
limits:
- Discoloration (anywhere).
- Missing thermal barrier coating,
- Erosion,
- Spalled areas,
- Craze cracks, and metal splatter,
- Missing material,
- Dirty airfoils.
Leading edge damage :
- cracks.
- burns and/or bulges.
- blocked cooling air passages.
Concave and convex surfaces :
- cracks.
Trailing edge damage :
- bulking and/or bowing.
- cracks.
Other airfoil areas :
- cracks.
- nicks, scores, scratches, or dents.
Inner and outer platforms :
- burns.
- cracks.
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