CFM CFM56-2 - Fan & Booster; N1 Rotor Indexing

EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
FAN AND
BOOSTER
BORESCOPE
INSPECTION
Page 74
Sep 03
FAN AND BOOSTER
(ALL) :
N1 rotor indexing.
Setting a reference angular position for the rotor provides
an easy method to return quickly and accurately to a
defect found earlier.
The following procedure enables the reference point for
the N1 rotor to be obtained. Refer to the AMM, 72-00-00,
for more information.
Align the leading edge of fan blade No 1 with the T12
temperature sensor, installed on the fan inlet cowl.
The No 1 fan blade is easily identied : it faces a
spherical indent mark on the spinner rear cone.
Numbering fan blades is performed by turning the rotor in
the clockwise direction (FLA).
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