b8 air turbine starter
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CFM, CFM56, LEAP and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma (Safran group) and GE. The information in this document is CFM Proprietary Information and is disclosed in confidence. It is the property of CFM International and its parent companies, and shall not be used, disclosed to others or reproduced without the express written consent of CFM. If consent is given for reproduction in whole or in part, this notice shall appear in any such reproduction in whole or in part. The information contained in this document may also be controlled by the U.S. and French export control laws. Unauthorized export or re-export is prohibited.
China Technical Review Meeting Suzhou, 18-20 November 2014
Air Turbine Starter
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– Reliability Trends
– Anniston Shop Findings Data
• Low Time Removals
• All Removals
– Top Removal Drivers
• Seal Leakage
• Inadvertent Decoupling
• Turbine Radial Bearing Failure
– Soft Time Approach
– Starter Clamp
– Conclusions
ATA 80: Air Turbine Starter (ATS) Air Turbine Starter uses high pressure air from APU, Ground Cart, or Cross Bleed to start main engine.
Agenda
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ATS Reliability Trend
MTBUR, 44646
MCBUR, 23769
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
500006
/1/2
00
8
8/1
/20
08
10
/1/2
00
8
12
/1/2
00
8
2/1
/20
09
4/1
/20
09
6/1
/20
09
8/1
/20
09
10
/1/2
00
9
12
/1/2
00
9
2/1
/20
10
4/1
/20
10
6/1
/20
10
8/1
/20
10
10
/1/2
01
0
12
/1/2
01
0
2/1
/20
11
4/1
/20
11
6/1
/20
11
8/1
/20
11
10
/1/2
01
1
12
/1/2
01
1
2/1
/20
12
4/1
/20
12
6/1
/20
12
8/1
/20
12
10
/1/2
01
2
12
/1/2
01
2
2/1
/20
13
FH
/FC
737NG Air Turbine Starter 3505945
MTBUR/MCBUR
ATS Reliability Stable, Varying with Each Operator
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Low Time ATS Removals
• CFM SB 80-0015 (HW SB 80-1865) Key driver
• Overall low number of low time removals
• Radial Bearing Failures - HW offering Commercial solution
• Seal leakage typically high time failure mode – monitoring for future LTR’s
0
1
2
Radial Bearing Failure NFF Seal Leakage
Starter Low Time Removals (<3000hrs) Anniston R&O Shop Jan 2013to Apr 2014
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Honeywell Anniston Shop Data
Prod fix
OCT10
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Seal Leakage
Seal Case
Seal Rotor
Spring
O-Ring
Carbon
Leakage path During start, oil leaks across seal and exits
starter through exhaust screen
• Pitting of carbon seal surface known to cause minor leaks (Average TSO/TSN 24K hrs)
• Preventative Action: Accomplish On-Condition Starter Inspection for Oil Leakage,
• MRB 70-802-01/70-812-02
• CMM 80-11-79, January 9, 2013 revision
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Inadvertent Decoupling
• Decoupler prevents back driving of turbine wheel, if clutch fails to disengage
• Inadvertent decoupling - Disengages despite normal starter operation
• Improved design uses Wear Resistant Steel Shaft with Spring Loaded Torsion Bar decoupler
• Torsion decoupler design used with other starters with no Inadvertent decoupling events
• Zero field starter inadvertent decoupling events on other engine applications with over 30 million flight hours
• CFM SB 80-0014/Honeywell SB 3505945-80-1861 released Apr13
• Production introduction April 2013
• 544 spare kits sold/installed globally
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Turbine Radial Bearing Failure
Turbine radial bearing failure occurrence independent of starter age
• Most failures exhibit blade liberation prior to rub event ~90%
• Some units returned show radial bearing failure without blade loss ~10%
• Failures experienced are random in hours/cycles
Honeywell Offers Commercial Solution to Customers when a confirmed event transpires
Extensive testing and analysis, yet no root cause indented
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• ATA 80 Status:
• No. 9 on 737NG Top (10) D/C Driver List
• No. 4 Cost Driver
• Soft-Time Benefits:
• Mitigates unscheduled removals (Operational D/C’s)
• Reduced LRU cost
• Reduced unscheduled Line Maintenance/AMT cost
• Addresses Primary Failure Modes, before incurring service interruption
• Mitigates passenger frustration
• Customizable to operators Approved Maintenance Program
• Schedule during Engine Shop Visit/C-Check Intervals
• Cycles/hrs vary per operator
Soft-Time Maintenance Approach
Analysis Conclusions/Recommendations
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Starter Clamp
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Starter Clamp
• Starter v-band clamp attaches ATS to gearbox QAD adapter
• Clamp failure leads to engine oil loss through starter • 2 IFSD’s due to clamp failures within last
12 months
• Clamps fail in high cycle fatigue in heat
affected zone (HAZ) of spot weld • Alternative design selected
• Target EIS 1Q 2015
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Conclusion
• Air Turbine Starter reliability Stable
• Failure modes understood with product or process improvements established
• Seal leakage
• Inadvertent decoupling
• Radial bearing failures will receive commercial solution • Soft Time Program will reduce service interruptions
Operators with significant ATS D&C’s Might consider soft-time approach
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Closing