Fan Disk Wear Versus Relube

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February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1
Fan Disk Wear Versus Relube
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
Fan Disk Pressure Faces Wear Versus Relube
Fan Disk Wear Versus Relube
Overview
 Fan disk wear rate status
CFM56-3 and CFM56-7B engine qty versus engine flight leg
CFM56-7B relube interval analysis versus CFM56-3 (1,500-3,000 cycles)
New relube interval proposal
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
 180 disks inspected with 856A4633G02 tooling
– 159 disks within serviceable limit
– 15 disks within service extension limit
– 6 disks beyond serviceable limit
Wear Rate Seems to Be Conducted Per Flight Hours
Fan Disk Pressure Faces Wear Versus Relube
Data concerning fan disk without relube, and fan blade without undercut
Fan Disk Wear Versus Relube
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
Engine Flight Leg Influence Wear Rate
Fan Disk Pressure Faces Wear Versus Flight Leg
Fan Disk Wear Versus Relube
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
CFM56-7B
Main engine population with
flightleg within 1.8 to 3.4
Significant sub-population
identified with flightleg
within 2.6 to 3.4
CFM56-3
Main engine population with flightleg
within 1.4 to 2
CFM56-7B Population Distribution Versus CFM56-3
Fan Disk Wear Versus Relube
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
Cycles: 3200 Max
Hours: 5000 Max
CFM56-7B Engine Yearly Utilization
Fan Disk Wear Versus Relube
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
 CFM56-3
Interval: 2500-4500 Hrs
 CFM56-7B
Interval: 1700-9500 Hrs
Factor 5 in Time, Can Be Reached With Current CESM Spec
CFM56-7B Fan Disk Relube Interval Analysis Vs -3
Fan Disk Wear Versus Relube
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
 Relube every 1,500 cycles and at letter check seem very similar
 Relube every 3,000 cycles seems very large for the Fleet 737 NG (2 years and
more)
 Introduction of relube threshold in operating hours for high flight leg customers
to provide better disk protection (does not affect most of CFM56-7B operators)
Cycles Hours 1500 cycles
(in Months)
3000 Cycles
(in Months)
12 Months
(hours/cycles)
15 Months
(hours/cycles)
Letter Check
inspection
3200 hours
(in Month)
Fleet NG 1557 3063 12 23 3063 / 1557 3829 / 1946 13
COA Fleet 1233 3693 15 29 3693 / 1233 4616 / 1541 10
Fleet 737 2000 2780 9 18 2780 / 2000 3475 / 2500 14
Yearly Relub interval
CFM56-7B Engine Relube Analysis
Fan Disk Wear Versus Relube
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, February 2002 WTT face to face or Export are Prohibited
Conclusion:
– Fan disk wear rate driven by accumulated flight hours
– CFM56-3 engine population much more homogeneous in term of flight
leg / fleet distribution
– Some CFM56-7B operators with high flight leg
– Relube interval proposal
Within 3,000 Cycles, or 5,000 Flight Hours,
Whichever Comes First
CFM56-7B Fan Disk Relube Proposal
Fan Disk Wear Versus Relube

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Fan Disk Wear Versus Relube