EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
HIGH PRESSURE
COMPRESSOR
BORESCOPE
INSPECTION
Page 98
Sep 03
HIGH PRESSURE COMPRESSOR (HPC)
(ALL) :
Rotor blades specic inspection areas.
HPC rotor blade stages are all different.
From stage 1 to stage 9, they become smaller and are
under greater load as the air pressure increases.
They are divided into 2 groups:
- stages 1 to 4
- stages 5 to 9
Critical inspection areas are not dimensionally identical
for each stage, and the level of criticality is also different.
Refer to the AMM for the precise dimensions of the
following critical areas:
The lower area of the airfoil.
This is the airfoil root radius area, plus the area
which extends toward the blade tip over approximately
25% of the height of the airfoil, and wraps around the
leading and trailing edges.
The top area of the airfoil.
- For stages 1 to 4, this is the blade tip.
- For stages 5 to 9, this is the blade tip, plus Area A.
Remaining areas.
They include:
- For stages 1 to 4, the area which wraps round the
leading and trailing edges over the remaining 75%
of the airfoil height.
- For stages 5 to 9, the area which wraps round the
leading and trailing edges, over a height limited to
Area B.
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