标题: High Thermal Stability Oil [打印本页] 作者: 航空 时间: 2011-4-13 08:45:33 标题: High Thermal Stability Oil
作者: 航空 时间: 2011-4-13 08:45:48
High Thermal Stability Oil Contents • HTS Oil Experience • MJO 291 In-service Issues • Other areas at risk investigated • Summary CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 3 Experience • With high thermal stability (HTS) oils (MJO 254, MJO 291, BPTO 2197) - Mobil MJO 254 in service for years now with no problem reported - Mobil MJO 291 approved for CFM56 in October, 2000 - Service Evaluation conducted on Two CFM56-5B4/2P - No issue identified after Engine parts inspection - Air BPTO 2197 (Former EXXON 2197) approved for CFM56 in October, 2000 - Service Evaluation conducted on two CFM56-3 engines - No issue identified after Engine parts inspection High Thermal Stability Oil HTS Oils Developed to Reduce Coking in Engine Oil Systems CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 4 High Thermal Stability Oil Mobil MJO291 In-Service Issues • Several oil leaks on Engines using MJO291 Oil • Two parts / areas affected - Servo-Fuel Heater / Main Fuel-oil Exchanger Gasket Seal - This seal at the interface of the two components is installed on all CFM56 Engine models (P/N 301-777-201-0) - N1 Speed Sensor Sealing - RTV732 used to seal Sensor onto Housing on CFM56-2, CFM56-3, and CFM56-5A CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 5 High Thermal Stability Oil Mobil MJO291 In-Service Issues • Servo-fuel heater / main fuel-oil exchanger gasket seal - Several oil leaks - 2 cases on CFM56-3 - 14 cases on CFM56-5B - 14 cases on CFM56-5A - 2 cases on CFM56-7B - SFH Seal material is fluorosilicon MJO 291 at High Temperature Is More Aggressive Than Other Oil Types CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 6 Servo-Fuel Heater - Main F/O exchanger gasket seal Damaged Fluorosilicon Seals High Thermal Stability Oil CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 7 High Thermal Stability Oil Mobil MJO291 In-Service Issues • SFH / MFE Gasket Seal containment Plan - Fleet Highlight article published in August, 2001 - Recommend replacement of the Gasket Seal every 2500 hrs or discontinue the use of MJO 291 until final fix issued - AOW 01/CFM56/448 issued on December 1, 2001 - Recommend operators to delay the introduction of MJO 291 until CFM laboratory investigation are completed Mobil Agreed to Not Promote, and Distribute the HTS Oil MJO 291 to Any New Operator Until Final Analysis Complete CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 8 High Thermal Stability Oil Mobil MJO291 In-Service Issues • SFH / MFE Gasket Seal final fix - New SFH Gasket Seal with Fluorocarbon material - New seal P/N 301-777-202-0 - Introduction on production Engines in April, 2002 - Seal available for in-service Engine in April, 2002 - S/B 79-0073 for CFM56-3 Engine - S/B 73-0172 for CFM56-5A Engine - S/B 73-0101 for CFM56-5B Engine - S/B 73-0116 for CFM56-5C Engine - S/B 79-0008 for CFM56-7B Engine CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 9 High Thermal Stability Oil Mobil MJO291 In-Service Issues • N1 Speed Sensor sealing - Several leaks - 37 cases on CFM56-3 - 4 cases on CFM56-5A - Lab investigations confirmed RTV732 damage resulting from oil exposure MJO 291 at High Temperature Is Chemically Aggressive to RTV732 CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 10 Fwd Sump N1 speed sensor Sensor housing Sleeve RTV732 High Thermal Stability Oil N1 Sensor - RTV732 Sealing Configuration CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 11 High Thermal Stability Oil Mobil MJO291 In-Service Issues • N1 Speed Sensor sealing final fix - Implementation of a Fluorocarbon seal (O-ring) instead of the RTV732 design - P/N : 649-788-415-0 - Introduction on production Engines in April 2002 - Seal available for in-service Engine in April 2002 - S/B 72-0511 for CFM56-2 Engine - S/B 72-0652 for CFM56-2B Engine - S/B 72-0906 for CFM56-2C Engine - S/B 72-0979 for CFM56-3 Engine - S/B 72-0643 for CFM56-5A Engine CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 12 Fluorocarbon Seal New N1 Sensor sealing design (O-ring) Fan Frame boss Sleeve High Thermal Stability Oil CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 13 Other areas at risk investigated • Components & Accessories parts - Main Heat Exchanger Matrix which is using RTV732 - SFH Inner Seals (Fluorosilicon) - Oil Tank inner self sealing Valve • Basic non metallic parts - Air / Oil Seal separator Torlon 4203 - FWD Sump external Oil piping Tresse AR3 - Stationary Air / Oil Seal Epoxy - Abradable material in Sumps - Bushing Bonding Loctite 640 High Thermal Stability Oil CFM Analysis to be completed by end of June, 2002 CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 14 High Thermal Stability Oil Fluorosilicon Inner Seals CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 15 Stationary air/oil Seal Structure Abradable Material Bushing Bonding Air/oil Separator FWD Sump External Piping High Thermal Stability Oil CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 16 • HTS Oils developed to reduce coking in Engine Oil Systems • Oil leaks on CFM56-3, and CFM56-5A operating with MJO 291 - S.F.H/M.H.E. Gasket Seal (fluorosilicon) - N1 Sensor RTV732 Sealing process • MJO 291 confirmed as the root cause of the problem • Corrective actions in place • Final CFM Analysis concerning remaining parts potentially at risk to be completed by end of June, 2002 High Thermal Stability Oil Summary CFM Strongly Recommends Operators to Not Introduced MJO 291 in Their Fleet Until Lab Analysis Complete作者: kinran 时间: 2011-6-4 23:32:37
