EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL
TRAINING MANUAL
REQUIREMENTS
BORESCOPE INSPECTION
Page 50
Sep 03
BORESCOPE ACCESS LIMITATIONS
(ALL) :
Probe 1 diameter limitation.
Consult the table for port diameters where probe 1 can
be used.
Borescope equipment temperature limitations.
It is not recommended that borescope inspection be
accomplished at temperatures above 130°F (54°C).
WARNING: HIGH TEMPERATURES MAY CAUSE
SERIOUS BURNS TO PERSONNEL AND DAMAGE TO
THE FIBER OPTIC EQUIPMENT.
Consult the table for information about time limitations,
prior to inspecting a hot engine.
To speed up the engine cool down time after shutdown,
the engine starter may be used to dry motor the engine,
(Refer to the AMM).
This sufficiently reduces the hot section area temperature
to allow inspection. But as the temperature will rise
again due to engine temperature soak-back, it is further
recommended that engine hot section inspection be
accomplished within 20 minutes, or before the internal
engine temperature reaches 130°F (54°C).
CAUTION: REFER TO AIRPLANE OPERATION
MANUAL FOR STARTER DUTY CYCLE PRIOR TO
MOTORING THE ENGINE.
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