EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
HIGH PRESSURE
TURBINE
BORESCOPE
INSPECTION
Page 130
Sep 03
HIGH PRESSURE TURBINE (HPT)
(ALL) :
Inspection with exible probe.
Use the exible probe with a guide tube to inspect the
HPT nozzle segments on the convex sides, the trailing
edges and the platforms.
CAUTION : DO NOT INSERT THE BORESCOPE BETWEEN
BLADES WHILE ROTATING THE ROTOR. THIS WILL
BREAK THE PROBE AND MAY REQUIRE ENGINE
DISASSEMBLY TO REMOVE THE BROKEN PIECE.
Insert guide tube 856A1310 (blue), or 856A1351 (red),
and position it between two nozzle vanes.
Carefully insert the exible probe into the guide tube and
monitor the probe insertion in between the nozzle vanes.
Inspect the convex side and trailing edge.
Inspect the inner and outer platforms by turning the
exible probe inside the guide tube.
Carefully push the exible probe into the guide tube to
inspect the next HPT nozzle segment.
Remove the exible probe and guide tube, re-insert them
in another borescope port and repeat the previous steps.
It is more convenient to use port S12 to inspect the
bottom left hand side of the engine, and port S14, to
inspect the right hand side.
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