CFM Turbine Rear Frame Module AFT Sump Inlet Cover O-Ring

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CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1
AFT Sump Inlet Cover O-Ring
Turbine Rear Frame Module
CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, CFM56-7B WTT Meeting - September,25-26/2002 or Export are Prohibited
Oil Inlet cover O-ring
Background
7 reported cases of Oil seepage from the Aft
sump (as of July 2002).
Affected engines range from
3400 to 9600 Hrs
2300 to 4000 Cy
Problem noticed through either
Oil Consumption up-shift (3 cases)
OR
External oil seepage / oily T/R blanket (stable
Oil Consumption)
AFT loooking FWD
Leak path
O-ring
Turbine Rear Frame Module
CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3
Root cause investigation
• Root cause identified  damaged Oil Inlet Cover O-Ring
• O-ring found brittle, hardened, with compression set and missing material.
• O-ring material (Viton E) properties affected due to local high temperature.
O-Ring : P/N 649-393-271-0
(IPC 72-00-00-70 Item 320)
Oil Inlet cover O-ring
Turbine Rear Frame Module
CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4
Additional Findings
• Other cause identified with same symptom
 cracked scavenge brazed nipple (Nbr 5 Brg Support)
(Qty: 3).
– due to b-nut torque applied w/o counter-torque
– require engine change
Field containment Plan
• On-Wing o-ring replacement procedure to be introduced in
the AMM.
• Procedure available at Boeing by End of October,
2002
• ESM procedure available.
Final Fix
• Potential Material change under evaluation
Oil Inlet cover O-ring
Turbine Rear Frame Module

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CFM Turbine Rear Frame Module AFT Sump Inlet Cover O-Ring