CFM Fan Rotor Module Booster Spool Wear

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CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1
Booster Spool Wear
Fan Rotor Module
CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2
Booster Spool Wear
Background
Glazing/wear marks evidenced on the
forward flange of the booster spool
at each fan blade position
As of today, 28 engines received
special inspection
 11 engines with no abnormal
condition found
 14 engines found with light
marks of wear noticed on
some areas
 3 engines found with deep
wear
– Up to 4 mils
Fan Rotor Module
Fwd booster
spool flange
Fan blade shank
Fan disk
CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3
0
0,05
0,1
0,15
0,2
0,25
0,3
0 5000 10000 15000 20000 25000 30000
OPERATING TIME (Cycles Since New)
WEAR DEPTH (mm)
Conditon v isually ev aluated
Wear depth measured
Fleet av erage
Projected wear at part life limit
expiration (30,000 cycles): 0,007
in. (0,19 mm)
7643
Booster Spool Wear Inspection Status
Fan Rotor Module
CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4
Engineering Activity completed
 Glazing/wear marks caused by contact with fan blade shank aft
surface during wind milling and engine start sequence (<33 rpm)
 Rig and engine tests completed in an effort to minimize wear in
future operation
 3000 cycles cumulated during engine test
– 3.256.000 rotation cumulated rig test
 Seven configurations tested
– Best result obtained with periodic lubrication of contact area
 Booster spool fwd flange and fan blade shank wear level
significantly reduced (3x)
Booster Spool Wear
Fan Rotor Module
Root Cause Identified - Final fix Defined
CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5
Corrective Actions
 CESM No.005 updated to implement periodic lubrication of the Fan Blade
shank rear surface
– Revision 001 issued in April, 2002
 Manual limits extended in effort to minimize in-service burden
– AMM revision issued in February, 2002
 Wear is permitted if not more than 0.008 in. (0,20 mm) deep
– New limit extension under review December, 2002
 Repair procedure being developed to restore part condition at piece-part
level
– Estimated completion date December, 2002
Booster Spool Wear
Fan Rotor Module

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CFM Fan Rotor Module Booster Spool Wear

chutiankuo0832

eptember,25-26/2002 CFMI / Boeing Pro