VBV System Lisbon A320/CFM56-5/5B Focus Team Conference June 2012 CFM International Proprietary Information 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, GE and Snecma (SAFRAN Group), 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
Background
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Fleet data • VBV issue can lead to operational events including ATB & ATO – 9 ATOs & 9 ATBs on the 5B fleet through May 2012 – Fleet disruptions related to EGT shift, Compressor Vane E/W or fuel leak at the gear motor location
• Main on-wing discrepancies reported – Ball screw actuators (master or slave actuators) hard to rotate – Stop mechanism seized – Flex shaft (main or slave) broken – Gear Motor
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Distribution of removed components • Detail of component removals – 5A/B engines – Based on data supplied to CFM – since 2009 • Gear Motor, Stop Mechanism and Flexshafts are the most removed VBV components – About 85% of the total removals VBV components removed since 2009 (Quantity) 180 160 140 120 100 80 60 40 20 0 Gear motor
Flex Shaft
Stop mec
RVDT
Slave Act
Master Act
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
Main flexshaft
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VBV system event contributors 2011
Répartition par cause racine Defective components ( 2011 events) Quantity; percentage (quantité ; pourcentage) 5; 10% 5; 10%
13; 25%
Gear Motor Stop Mechanism
5; 9%
Flexible Shaft 12; 23% 12; 23%
Slave Actuator Position Sensor Master Actuator
Gear Motor, Stop Mechanism and Flex shafts contribute to 71% of the VBV related events CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Analysis •
Stop mechanism •
CFM/Honeywell Root Cause analysis on-going •
•
Flexible shaft • •
•
Typically a secondary damage of ballscrew actuators hard to rotate Several cases reported without findings on the other VBV components
Gear motor •
•
Major observations from investigations: • Nut seized on screw • Fretting damage to screw threads • Bearings difficult to rotate / seized • Significant Lack of grease
suffering from the kinematics getting harder to actuate, also from pollution within the fuel.
CFM additional preventive maintenance recommendation: –
CFM recommends to apply the SB 75-0043 - regreasing of master and slave actuators - to relief VBV system.
Re-greasing procedure will improve the VBV system kinematics CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Cliquez pour modifier le style du titre Regreasing procedure of Master and Slave actuators SB 75-0043
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This document is a Bullet Point presentation. It may be misinterpreted without the proper comments from an appropriate CFM representative. CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Ballscrew on-wing regreasing procedure – SB 75-0043 • On-wing regreasing procedure – Approved & Issued early May 2012 – Master and slave ballscrew actuators concerned – Regreasing reduces the actuation torque of the complete VBV system • Full efficiency if 1st regreasing prior to 3000FH then every 3000FH
– Appropriate tooling supplied by Honeywell
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Ballscrew on-wing regreasing procedure – SB 75-0043 • Procedure sequence – – – – –
Get access to VBV doors (11 slaves & 1 master) Prepare Mobil 28 grease hand pump Localize grease fitting hole of each door & clean it Apply 0,1 Oz (2,8 g) via the grease fitting hole Actuate VBV system from 2 O’clock door at least 3 times open / close to distribute grease into ballscrews – make sure system operates smoothly & freely – Perform RVDT rigging & MCDU check
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Ballscrew on-wing regreasing procedure – SB 75-0043 • Procedure feedback (tested with operators in April 2012) – Doors near 12 o’clock position are the most difficult to get access to. If possible thrust reverser cowls should be fully deployed – Mirror shall be used in this area – Amount of grease shall be measured pending on customer own tooling – 4 hours with 2 mechanics Greasing gun
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
Mirror to help fitting greasing hole
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Regreasing experience
• TAM Fleet: 184 Engines – 2000 FH to 22000 FH
• Implemented the regreasing procedure via Engineering Order 2 years ago into their Fleet ( 2000- 22000FH) – No VBV-ballscrew-event reported since.
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Regreasing experience CFM would like to thank all operators for their support during the development of this procedure
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Cliquez pour modifier le style du titre
Troubleshooting improvements
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This document is a Bullet Point presentation. It may be misinterpreted without the proper comments from an appropriate CFM representative. CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Troubleshooting modifications • Objective: Improve the on-wing troubleshooting in case of VBV issue Proposal draft Current Remove GM/SM assy Operate VBV manually Check resistance / RVDT/J8/HMU
Hard to rotate?
N Y
replace
Operate SM/ freely?
replace
Operate GM/ freely?
Remove/Insp/replace flexshafts damaged Operate each VBV slave doors manually/ replace any suspect Remove GM/SM assy replace
Operate GM/ freely?
replace
Operate SM/ freely?
replace
Operate master door/ freely? Inspec Main flexshaft
Inspec Main flexshaft
T/S Gear motor & Stop mechanism first Check resistance / RVDT/J8/HMU
Operate VBV with tooling at Master door position/ mesure the torque
N
Torque > CMM limit?
Under Evaluation
Y
Remove/Insp/replace flexshafts damaged Operate each VBV slave doors manually/ replace any suspect
New T/S will reduce the time needed by testing of gear motor and stop CFM International Proprietary Information subject to the restrictions on the cover of this presentation mechanism first. Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Troubleshooting modifications • Perform T/S of Gear Motor and Stop Mechanism as first T/S operations – Main advantage : First component inspected are the most removed one decreasing the time spent for T/S
• Development of a system torque check procedure (after removal of GM and SM) • Introduction of a torque key in the Master ballscrew Socket to measure the actuation torque of the system • Maintenance Torque limits to be defined • Maintenance limits defined and to be substantiated
Trouble Shooting procedure update expected 4Q12 CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Cliquez pour modifier le style du titre Maintenance proposition to reduce VBV system related events
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This document is a Bullet Point presentation. It may be misinterpreted without the proper comments from an appropriate CFM representative. CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Fleet status, prediction and go forward • Based on above Weibulls, CFM evaluates a soft time for the VBV system at 15,000hrs, 2nd C-check
No Maintenance
Overhaul at SV Soft time implementation 10,000 hrs /15,000 hours
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Fleet status, prediction and go forward • Introduction of soft time scheduled for sept. 2012 – Service Bulletin Cat. 7
• Pending efficiency of re-greasing procedure, CFM propose implementation of 15,000 hrs threshold for VBV System Preventive Maintenance • Recommendation to be updated with CFM56-5B fleet re-greasing feedback
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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Summary • CFM recommends VBV system overhaul at SV (SB 75-0032, cat 3) • CFM recommends application of re-greasing to the ball screw actuators using SB 75-0043, cat 7 • CFM proposes a modification to the VBV system Trouble shooting. Available by 4Q12 • Based on actual and predicted fleet data, CFM recommends a soft time at 15000 hours, in order to decrease the amount of VBV system related events – Availability by September 2012 – to be updated with CFM56-5B fleet re-greasing feedback
CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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QUESTIONS / DISCUSSION CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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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, General Electric and Snecma, Safran group 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 This document is a Bullet Point presentation. It may be misinterpreted without the proper comments from an appropriate CFM representative. CFM International Proprietary Information subject to the restrictions on the cover of this presentation Lisbon CFM56-5ABC Focus Team June 2012 CFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE
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