EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL
TRAINING MANUAL
REQUIREMENTS
BORESCOPE INSPECTION
Page 70
Sep 03
CORE ENGINE ROTATION
(ALL) :
Another way of turning the core is through Electronic
Turning Tool (ETT) Sweeney, P/N 18946, which adapts on
the same pad as the pneumatic motor.
ETT method:
Install the plate adapter, drive shaft and ETT motor
assembly on the adequate pad, with a QAD clamp.
The direction of rotation and speed of the core engine
rotor can be selected on the control box.
The ETT can control rotation and help avoid overshoot
during inspection of the rotor blades. It also has an
automatic feature to count blades and damage can be
flagged for a quick future reference.
The information can also be stored for the next
inspection.
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