High Thermal Stability Oil

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High Thermal Stability Oil

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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