CFM HPC Stage 1 and 2 Spool Life

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February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1
HPC Stage 1 and 2
Spool Life
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2
1-2 Spool Life Extension Status
• CFM56 HPCR 1-2 Spools have experienced edge of contact cracking
– Blade vibration leads to fretting on pressure face
– Fretting leads to crack initiation at edge of contact
– Low stress is consistent with the shallow cracks found in spools
cut up to date
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3
1-2 Spool Life Extension Status
• At time of initial certification for -7, CFMI proposed a 20,000 cycle
Manual Limit for the long dovetail 1-2 Spool
– Minimum calculated LCF life is >100,000 cycles for edge of contact
location
– A restriction was placed on the limit at initial certification based on
contact cracking in other engine line
• Result: 1-2 Spool Manual Limit is currently 13,000 cycles
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4
• CFMI has an approved plan with the Agencies to allow removal of the
13,000 cycle restriction on the CFM56-7B 1-2 Spool Manual Limit
– Plan utilizes analysis and data from 2 field run -7B spools between
8,000 and 10,000 cycles to substantiate LLP life extension
– Timing precedes first field engine reaching 13,000 cycles
• Plan does not require any special inspections on the -7 spool to reach
20,000 cycle life limit
1-2 Spool Life Extension Status
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5
• First -7B high time spool has been removed and inspected
– ESN 875-134, with 1-2 Spool GWNBM937 TSN 12,380, CSN 8879
– Part received both standard FPI inspection, and high
sensitivity 10X white light inspection - both inspections
showed NO indications
– Second spool identified and will be removed Feb 2002
• Current fallout estimate against current manual limit is 1Q2003
1-2 Spool Life Extension Status

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CFM HPC Stage 1 and 2 Spool Life

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good materials