EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
HIGH PRESSURE
TURBINE
BORESCOPE
INSPECTION
Page 132
Sep 03
HIGH PRESSURE TURBINE (HPT)
(ALL) :
Inspection of the HPT nozzle is usually carried out in
conjunction with the combustion chamber inspection.
HPT nozzle inspection areas.
The HPT nozzle vanes are cast shells and internally
divided into forward and aft cooling compartments.
CDP cooling air enters the vane compartments through
the inner and outer ends of the vanes and exits through
holes in the vanes’s leading edge and slots in the trailing
edge. The vanes have a thermal barrier coating.
The following are the inspection areas for the vanes :
- Leading edge.
- Trailing edge.
- Thermal barrier coating.
- Nose holes.
- Gill holes.
- Trailing edge slots.
- Concave surfaces.
- Convex surfaces, or the aft side of the vane.
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