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