EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
HIGH PRESSURE
TURBINE
BORESCOPE
INSPECTION
Page 136
Sep 03
HIGH PRESSURE TURBINE (HPT)
(ALL) :
Inspection with a rigid probe.
(-2, -3, -5A) :
Inspect the HPT rotor blade T/E and the rear portion of
the HPT shroud, through ports S17 and S18.
(-5B, -5C, -7B) :
Inspect the HPT rotor blade T/E and the rear portion of
the HPT shroud, through ports S16 and S17.
(ALL) :
First, go through HPC port S4 and use probe No 3
(green) to perform the N2 rotor zero index position
procedure.
Once the core rotor is indexed, inspect the HPT blade
T/E, tips, concave and convex sides.
Use probes 2, 3 and 4. Probe No 2 (yellow) is used for
general inspection. Probes No 3 (green) and No 4 (blue)
are used to carry out a detailed inspection of the platform
and tip areas.
If defects are found, an inspection of the L/E has to be
performed.
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