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7/17/2019 12_VBV System[1].pdf
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VBV System
CFM International Proprietary Information
The information in th is document is CFM Proprietary Information and is di sclosed in con fidence. It is the property of CFM
International and its p arent companies, GE and Snecma (SAFRAN Group), and shall n ot be used, di sclosed to o thers or
reproduced without th e express written consent of CFM. If consent is given for reprodu ction in whol e or in part, thisnotice shall appear in any such reproduction i n whole or in part. The information contained in th is document may also be
controlled b y the U.S. and French export control laws. Unauthorized export or re-export is proh ibited
Lisbon A320/CFM56-5/5B Focus Team Conference
June 2012
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 2Lisbo n CFM56-5ABC Focus Team Ju ne 2012
Background
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 3Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 4Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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 VBVcomponents
– About 85% of the total removals
0
20
40
60
80
100
120
140
160
180
Gear motor Flex Shaft Stop mec RVDT Slave Act Master Act Main flexshaft
VBV components removed since 2009 (Quantity)
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 5Lisbo n CFM56-5ABC Focus Team Ju ne 2012
VBV system event contributors 2011
13; 25%
12; 23%
12; 23%
5; 9%
5; 10%
5; 10%
Répartition par cause racine(quantité ; pourcentage)
Gear Motor
Stop Mechanism
Flexible Shaft
Slave Actuator
Position Sensor
Master Actuator
Defective components ( 2011 events)Quantity; percentage
Gear Motor, Stop Mechanism and Flex shafts contribute to 71% of the VBV
related events
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 6Lisbo n CFM56-5ABC Focus Team Ju ne 2012
Analysis
• Stop mechanism
• CFM/Honeywell Root Cause analysis on-going• Major observations from investigations:
• Nut seized on screw
• Fretting damage to screw threads
• Bearings difficult to rotate / seized
• Significant Lack of grease
• Flexible shaft• Typically a secondary damage of ballscrew actuators hard to rotate• Several cases reported without findings on the other VBV components
• Gear motor• suffering from the kinematics getting harder to actuate, also from pollution within the fuel.
• CFM addit ional preventive maintenance recommendation:
– CFM recommends to apply the SB 75-0043 - regreasing of master and slaveactuators - to relief VBV system.
Re-greasing procedure will improve the VBV system kinematics
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 7Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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>>Regreasing p roc edure of Master and Slave actuators
SB 75 0043
7This document is a Bullet Point presentation. It may be misinterpreted without the proper comments from an appropriate CFM representative.
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 8Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 9Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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 timesopen / close to distribute grease into ballscrews – makesure system operates smoothly & freely
– Perform RVDT rigging & MCDU check
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 10Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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 mechanicsMirror to help fitting
greasing holeGreasing gun
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 11Lisbo n CFM56-5ABC Focus Team Ju ne 2012
Regreasing experience
• TAM Fleet: 184 Engines – 2000 FH to 22000 FH
• Implemented the regreasing procedure via EngineeringOrder 2 years ago into their Fleet ( 2000- 22000FH)
– No VBV-ballscrew-event reported since.
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 12Lisbo n CFM56-5ABC Focus Team Ju ne 2012
Regreasing experience
CFM would like to thank all operators for theirsupport during the development of this procedure
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 13Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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>>Troub lesho ot ing improvem ents
13This document is a Bullet Point presentation. It may be misinterpreted without the proper comments from an appropriate CFM representative.
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 14Lisbo n CFM56-5ABC Focus Team Ju ne 2012
Troubleshooting modifications
• Objective: Improve the on-wing troubleshooting in case of VBV issue
Operate VBV manually
Y
NCheck resistance
/ RVDT/J8/HMU
Hard to rotate?
Remove/Insp/replace flexshafts
damaged
Operate each VBV slave doors
manually/ replace any suspect
Remove GM/SM assy
Operate GM/ freely?
Operate SM/ freely?
Operate master door/ freely?
replace
replace
replace
Inspec Main flexshaft
Current
Operate VBVwith tooling at Master
door position/ mesure the torque
Y
N
Check resistance
/ RVDT/J8/HMU
Torque > CMM
limit?
Remove/Insp/replace flexshaftsdamaged
Operate each VBV slave doors
manually/ replace any suspect
Remove GM/SM assy
Operate SM/ freely?
Operate GM/ freely?
replace
replace
Inspec Main flexshaft
Proposal draft
T/S Gear motor &Stop mechanism
first
New T/S will reduce the time needed by testing of gear motor and stop
mechanism first.
Under
Evaluation
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 15Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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 timespent for T/S
• Development of a system torque check
procedure (after removal of GM and SM)
• Introduction of a torque key in the Masterballscrew 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
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 16Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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>>Maintenance pro pos i t ion to reduce VBV sys tem
related events
16This document is a Bullet Point presentation. It may be misinterpreted without the proper comments from an appropriate CFM representative.
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 17Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 18Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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 of15,000 hrs threshold for VBV System Preventive Maintenance
• Recommendation to be updated with CFM56-5B fleet re-greasing feedback
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 19Lisbo n CFM56-5ABC Focus Team Ju ne 2012
Summary
• CFM recommends VBV system overhaul at SV (SB 75-0032, cat 3)
• CFM recommends application of re-greasing to the ball screw actuatorsusing 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 at15000 hours, in order to decrease the amount of VBV system relatedevents
– Availability by September 2012 – to be updated with CFM56-5B fleet re-greasing feedback
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationCFM, CFM56, LEAP56, LEAP-X and the CFM logo are trademarks of CFM International, a 50/50 joint company between Snecma and GE 20Lisbo n CFM56-5ABC Focus Team Ju ne 2012
QUESTIONS / DISCUSSION
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CFM International Proprietary Information subject to the restrictions on the cover of this presentationC C C fC / S G 21Lisbo n CFM56-5ABC Focus Team Ju ne 2012
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.