CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 Booster Vane Outer Shroud Abradable Material Deterioration Fan Stator Module CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 Background Several reported cases where booster vanes were found with outer shroud coating (Metco 601NS) missing – Condition was discovered during routine on-wing or in-shop inspection No associated operational consequences reported – Other CFM56 engine models affected – Cases found on high time engines – Missing coating often extends locally on lower side at 6 o’clock position Booster Abradable Material Deterioration CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 Engineering assessment Root cause investigation - Completed – Abradable Aluminum particles deteriorated by Chlorine, sulfur – Booster drain system not a predominant factor Potential impact on engine performance – Effect on Booster stall margin to be demonstrated Stall line, and operating line slightly impacted To be confirmed by engine test » Test results expected 2Q 2003 Booster Abradable Material Deterioration CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 VVisisuuaallCCoonnddititioionnooffBBoooosstteerrVVaanneeOOuutteerrSShhrroouuddMMaatteerriaiall Booster Abradable Material Deterioration CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5 Corrective Action Plan Extend serviceable limit when missing coating is noticed to minimize in-service burden – New AMM limits to be issued based on engine test results Continue in-service extension could be granted – Current AMM limit 100 cm2 [15.5 sq-in] of missing material Overserviceability of 100 hours is available – Current ESM limit Not serviceable Repair procedure available to restore part condition Evaluation of a new abradable material bond coat – Alternate solution being evaluated through corrosion tests Long term activity Booster Abradable Material Deterioration作者: kinran 时间: 2011-6-4 22:35:29
