February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 Booster Spool Counter-Weights February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 Issue: • Fan platform attachment lug cracking Rig test finding Lug bending from fan platform centrifugal load No containment concern in-service Interim Action: • Counter-weight (prevents lug bending) SB 72-296 Kit P/N 333-089-157-0 Introd. on prod. engines since Dec 00 Forward Flange Lugs Counterweight Booster Spool Counter-Weights February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 Field Plan: • Install counter-weights on 1,600 engines Installation above 7,000 cycles requires EC inspection (SB 72-295) 934 kits delivered as of 8 Jan 2002 Delivery rate > 75 kits/month Final Production Improvement: • Thicker Booster spool flange (since Jul 2001) SB 72-300 P/N 340-000-816-0 No need for counter-weight, and EC Inspection (SB 72-295) Booster Spool Counter-Weights作者: kinran 时间: 2011-6-4 23:32:33
