CFM CFM56 Series User Manual

EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
LOW PRESSURE
TURBINE
BORESCOPE
INSPECTION
Page 148
Sep 03
LOW PRESSURE TURBINE (LPT)
(ALL) :
The LPT features long span blades. Moving the probe in
and out enables a full-length inspection, which always
starts at the blade platform.
Index the N1 rotor, and turn it CW (ALF) to see the L/E
and concave side.
Turn it CCW (ALF) to see the T/E and convex side.
Stage 1 blades.
Inspection of the leading edges and the concave sides of
the stage 1 LPT blades can be done during inspection of
the HPT blade trailing edges.
(-2, -3, -5A) : Borescope plugs S17, S18, are removed
and an initial overall inspection, using the yellow probe,
may be performed to evaluate the blade condition.
(-5B, -5C, -7B) : Borescope plugs S16, S17, are removed
and an initial overall inspection, using the yellow probe,
may be performed to evaluate the blade condition.
(ALL) : Use probes 2, 3 and 4 (yellow, green and blue)
to inspect the blade roots and tips.
(-2, -3, -5A, -5B, -7B) :
Stage 2 thru 4 blades.
(-5C) :
Stage 2 thru 5 blades.
(-2, -3, -5A) :
These three stages are viewed respectively through ports
S20, S21 and S22.
(-5B, -7B) :
These three stages are viewed respectively through ports
S18, S19 and S20.
(-5C) :
These four stages are viewed respectively through ports
S18, S19, S20 and S21.
(ALL) :
Through a given nozzle stage port, it is possible to view
the T/E of the previous stage blade, and the L/E of the
current stage blade.
Use probes 2, 3 and 4. To obtain a better evaluation of
the defects, use probe 1 (black) where possible.
The trailing edge of the last stage blades can be
inspected through an instrumentation boss on the turbine
frame.
TOC

CFM CFM56 Series Specifications

General

Brand	CFM
Model	CFM56 Series
Category	Engine
Language	English