CFM56-7 Starter Reliability

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CFM56-7
Starter
Reliability
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 2
0
10000
20000
30000
40000
50000
Jan-99
Mar-99
May-99
Jul-99
Sep-99
Nov-99
Jan-00
Mar-00
May-00
Jul-00
Sep-00
Nov-00
Jan-01
Mar-01
May-01
Jul-01
Sep-01
Nov-01
Date
MTBUR (hours)
12 Month Rolling Average
MTBUR
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 3
Summary of -P08 Reported Removals
Leakage is Top Removal
0
10
20
30
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90
100
Oil Leakage Debris on
mag plug
No start FOD No Report
Findings
Count
Leakage is Top Cause for Removal
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 4
 Typical Symptoms
-White smoke during engine starts
- Oil dripping from starter screen
 Cause Identified
-O-ring friction increases with time and temperature
-Spring forces insufficient to maintain contact between
carbon seal and rotor resulting in oil leakage
 Fix to be Implemented
- Fluorocarbon O-ring material changed from durometer
75 to durometer 60 to reduce friction
Oil Leaks Leading Cause for Removals
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 5
Seal
Oil Leak
Smoke
Seal Case
O-ring
Carbon Ring
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 6
2001
4th Qtr 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr
Turbine Seal Wear
Couple Testing
Oil Leakage TOPS8D
2000 2002
Turbine Rotating Group
TOPS8D Analysis & Test Complete
Introduce Turbine Stack & Seal Design
Changes
Turbine Seal Turn-on/Turn-off
Test Complete
P09
Introduction
P10
Introduction
Starter Definitions
• P09: Existing P07 or P08 with redesigned Turbine Seal
- Upgrade P07 or P08 field units at first shop visit - no charge
• P10: P08 with Redesigned Turbine Seal and Turbine Stack
- New production unit
- Upgrade P08 field units to P10 at Customer request
- Cannot upgrade a P09 to a P10 if P09 is upgraded from a P07
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 7
P07
P09
P08
-or-
Redesigned Turbine
Seal
Redesigned Turbine Seal
and Turbine Stack
P08 P09 P10
P07 P09 P10
*Cannot upgrade to P10 from P09 if the P09 is based on a P07 upgrade
Starter Part Definition & Upgrade Trees
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 8
• Program 95% complete
• 65 units remain for upgrade
• Free upgrade ends Apr 2002 per
SB 80-005
Fleet Wide P08 Upgrade Status
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 9
Summary
• Root Cause of oil leakage established
• P09 upgrades available in July 2002
• New P10 starter upgrades to be introduced
September 2002

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CFM56-7 Starter Reliability

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CFM56-7 Starter Reliability