EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
COMBUSTION
CHAMBER
BORESCOPE
INSPECTION
Page 106
Sep 03
COMBUSTION SECTION
(ALL) :
Borescope inspection of the combustion section may
be required for a visual assessment as part of the on-
condition maintenance plan.
It may also result from engine problems, FOD, emission
of pollution, trend symptoms such as overtemperature, or
troubleshooting / fault isolation.
The following are the inspection areas for the combustion
chamber liners.
Inspection of SAC outer liner.
The outer liner has a dome band and 5 panels.
Panel 1 features 2 igniter holes (with ferrules), and
medium and large dilution holes. Four of the large
holes are used as borescope ports.
Panel 3 features medium dilution holes.
Inspection of SAC inner liner.
The inner liner has a dome band and 4 panels.
Panel 1 features medium and large dilution holes.
Panel 3 features medium dilution holes.
There are many lm cooling holes under the overhang
between each panel of the inner and outer liners.
Both inner and outer liners have a thermal barrier coating
(TBC) on their inner surface.
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