CFM56-7B N1 Vibration Discussions

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Dallas, June 03 CFM56-7B N1 Vibration Discussions CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 2 Qualification and Production Experience •Development and Certification •Production Engine Test Cell In-Service Vibration Team (May 2000) Introduction CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 3 • CFMI performed extensive engine testing to demonstrate propulsion system high cycle integrity - Long term integrity demonstrated for extra severe levels of rotor unbalance • CFM56-7B endurance testing with 737NG Propulsion System Hardware - Hardware: Inlet, Exhaust System, Mounts, Strut, Full EBU, Thrust Reverser, and AGB mounted components - HP and LP Stair step dwell - 14 mils da (4.0 AVM units) & 3.0 ips pk (4.6 AVM units) minimum of 105 Cycles every 120 rpm - HP endurance - 2.5 ips pk (3.8 AVM unit) - 10,000 rpm for 17 hours, 107 cycles - LP endurance - 25 mils da (+5 AVM units) - 5,200 rpm for 34 hours, 107 cycles - AGB Endurance - 26 mils da on AGB - 2,500 rpm for 30 hours, 5106 cycles Certification Test Description CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 4 CFM56-7B N1 Vib Endurance 0 CFM56-7 Vibration Signature - Fan Unbalance AVM Units 5 FFCC 0 1000 2000 3000 4000 5000 6000 LP Speed - RPM 0. 5. 10. 15. 20. 25. 30. Displacment - Mils DA Typical production level Maintenance Guidelines Test Cell Limit Endurance Dwell 107 cycles, 32 hours 27 mil (+5 units) Propulsion System durability demonstrated to +5 units CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 5 Maintenance Level AVM Units 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 8000 9000 10000 11000 12000 13000 14000 15000 16000 N2 Speed (rpm) FFCC N2 Vib (ips pk) Vibration Signature for HP Unbalance Intentional HP Unbalance FFCC N2 Vib Signature Endurance Dwell Testing 107 Cycles, 17 Hours 2.5 ips pk (+3.8 AVM units) Test Cell and Airplane Delivery Ship Limit 3.0 4.0 5.0 Propulsion System durability demonstrated to +4 units CFM56-7B N2 Vib Endurance CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 6 Faults noticed during Endurance Test Vibration Endurance Hardware Faults ITEM DATE TRT TEST PHASE TIME PPN NOMENCLATURE PART NUMBER DESCRIPTION OF FAULT 1 1/6/96 20:56 Vibe Sensitivity 63300 P3 tube 1958M66G01 PS3 tube broken at aft end 2 1/17/96 28:35 Vibe Sensitivity 63501 9 th Stage ECS Manifold 1882M80G01 9 th stg ECS manifold ball joint leaking. Replaced manifold and removed PPN 63514 bracket, (2) 63950 spring dampers, (2) 63526 bolts and (2) 63521 bolts 3 2/1/96 79:05 LP endurance 00:39 36701 VSV Fuel Manifold 1898M53G01 Fuel leak from right side VSV actuator tube, broken at weld close to actuator 4 2/6/96 92:22 LP endurance 10:36 45184 Clamp, Oil tube support J1221G12 Clamp broken located on oil scavenge tube 45102 on bracket PPN 6111C 2 2/8/96 106:00 LP endurance 21:04 63501 9th Stage ECN Manifold 1882M80G01 Manifold ball joint leak. Second failure of this part number duct, same joint 5 2/9/96 107:35 LP endurance 21:04 63311 Bracket, PS3 Tube Support 1894M92G01 PS3 tube support bracket broken through bend 2 2/9/96 107:35 LP endurance 21:04 63501 9th Stage ECN Manifold 1882M80G01 Manifold ball joint leak. Third failure on this part number. Removed and replaced With modified manifold. Added bracket PPN 63514 and bolts 6 2/12/96 117:34 LP endurance 26:57 37600 Left side VSV Drain Manifold 1898M16G01 VSV drain tube and core drain manifold broken 7 2/13/96 120:09 LP endurance 28:33 37000 Drain Header Manifold 1898M43G01 Fuel leak from left side VSV actuator tube, broken at weld close to actuator 8 2/13/96 120:09 LP endurance 28:33 36801 VSV Fuel Manifold 1898M55G01 Fuel leak from VSV servo fuel tube, broken at tube weld close to actuator 9 2/14/96 120:09 LP endurance 28:33 36881 VSV Manifold Clamp J1221G06 Broken VSV tube clamp on bracket PPN 36715 10 2/14/96 120:09 LP endurance 28:33 36781 VSV Manifold Clamp J1221G06 Broken VSV tube clamp on bracket PPN 36712 11 2/24/96 193:12 Instrum. Test Run 66L14 Bracket, Electrical interface 1898M86G01 Bracket cracked at connector interface 12 3/6/96 196:50 Post Test Insp 69A1R Bracket, CTAI Duct 1898M77G01 Bracket cracked through bolt mounting hole 13 3/6/96 196:50 Post Test Insp 07100 VSV Bellcranck Assembly 1276M84G15 Lower plate mounting lug broken off on left side, cracked on right side 14 1/10/96 23:50 Vibe Sensitivity 66A00 #1 Bearing Sensor 340-401-001-0 Replaced due to dubious output based on previous –7 experience 15 1/10/96 23:50 Vibe Sensitivity 830B2 Fan Blade Platforme 340-001-803-0 15 platform seals missing or damaged 16 1/26/96 51:25 HP Stairstep 3:00 30900 Main Fuel Pump 340-402-101-0 Main fuel pump shaft seal leaking 595 cc/min 17 2/3/96 79:05 LP endurance 00:39 9510U 9:00 Strut Fairing 340-065-002-0 Nut plate on 9:00 strut fairing has broken tab 18 2/3/96 79:05 LP endurance 00:39 038BA AGB IDG Pad Carbon Seal 305-115-704-0 AGB IDG pad carbon seal leaking 19 2/4/96 79:05 LP endurance 00:39 840P3 Fan OGV Seal 340-002-201-0 Fan OGV inner shroud seal missing 20 2/6/96 92:22 LP endurance 10:36 93585 LPT Tube Hinge Clamp 649-411-726-0 Hinge clamp broken 21 2/6/96 92:22 LP endurance 10:36 69B0D Fire Detection Harness 325-012-701-0 Cable wires broken at the terminal lug 22 2/7/96 101:44 LP endurance 18:56 69A8F EGT Harness Clamp 649-411-955-0 Clamp missing protective material and chafing on EGT harnesses 23 2/7/96 101:44 LP endurance 18:56 69A0C HPTCC Cable Connectors 325-015-001-0 Cables found loose on HPTCC valve 24 2/7/96 101:44 LP endurance 18:56 69AOK CJ9 Electrical Harness 325-016-201-0 EGT harness chafing bracket and bolt 25 2/12/96 117:34 LP endurance 26:57 69801 EGT harness 340-402-502-0 High EGT indication. Harness inoperable 26 2/13/96 120:09 LP endurance 28:33 KCSEO DPM Box Support Bracket 340-119-801-0 DPM box support bracket cracked across one side 27 2/18/96 144:41 AGB endurance 14:44 690A7 J12 Harness Bracket 340-090-501-0 Springclip broken off of bracket 28 2/19/96 147:01 AGB endurance 17:04 31500 Fuel Filter Assembly 340-103-001 Lower mount lug cracked in two places 29 2/21/96 172:30 ETOPS stairstep 69AOG TBV Cable Connectors 325-016-001-0 TBV fault. Electrical connectors found loose at TBV 30 2/21/96 190:35 ETOPS stairstep 69802 T5 sensor 340-402-401-0 T5 condition monitoring sensor cable broken 31 2/21/96 190:35 ETOPS stairstep 69AOL CJ10 Electrical harness 325-016-301-0 Lead frayed at both ends 32 2/22/96 190:35 ETOPS stairstep 698A01 EGT harness 325-402-502-0 Sector 4 EGT probe broken Issued from CR-929 34 items reported during vib endurance test CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 7 Faults noticed during Cert Endurance Test (Fan and AGB mounted components) ITEM DATE TRT TEST PHASE TIME PPN NOMENCLATURE PART NUMBER DESCRIPTIONOF FAULT 4 2/6/96 92:22 LP endurance 10:36 45184 Clamp, Oil tube support J1221G12 Clamp broken located on oil scavenge tube 45102 on bracket PPN6111C 16 1/26/96 51:25 HP Stairstep 3:00 30900 Main Fuel Pump 340-402-101-0 Main fuel pump shaft seal leaking 595 cc/min 17 2/3/96 79:05 LP endurance 00:39 9510U 9:00 Strut Fairing 340-065-002-0 Nut plate on 9:00 strut fairing has broken tab 18 2/3/96 79:05 LP endurance 00:39 038BA AGB IDGPad Carbon Seal 305-115-704-0 AGB IDGpad carbon seal leaking 21 2/6/96 92:22 LP endurance 10:36 69B0D Fire Detection Harness 325-012-701-0 Cable wires broken at the terminal lug 26 2/13/96 120:09 LP endurance 28:33 KCSEO DPMBox Support Bracket 340-119-801-0 DPMbox support bracket cracked across one side 27 2/18/96 144:41 AGB endurance 14:44 690A7 J12 Harness Bracket 340-090-501-0 Springclip broken off of bracket 28 2/19/96 147:01 AGB endurance 17:04 31500 Fuel Filter Assembly 340-103-001 Lower mount lug cracked in two places 31 2/21/96 190:35 ETOPS stairstep 69AOL CJ10 Electrical harness 325-016-301-0 Lead frayed at both ends Item 4 (clamp): No in-service report Extracted from CR-929 Item 16 (MFP): Events reported in early 2001 - Fix implemented sept 2001 Item 17 (Strut Fairing): no similar in-service report Item 18 (AGB pad leak): A couple of in-service report / 2 seal materials Item 21 (Fire dectector harness): Similar in-service reports - Fix implemented in 1997 Item 26 (bracket) : no in-service report Item 27 (springclip): no in-service report Item 28 (Fuel filter mount lug): no similar in-service report Item 31 (frayed lead) Events reported in service Fix implemented in 1997 (from 325 016 301 to 325 025 401) 9 items reported on Fan Case/AGB mounted components Fix implemented: Items 16, 21 & 31 Need further investigations: Item 18 CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 8 CFM Production - Fan Trim Balance • Vibration levels during production acceptance test - #1Brg, FFCC max LP vib level < 2.5 mils prior to delivery - Additional balance performed to achieve low level (~1 mil) at Boeing flightline • Fan trim balance conducted by recording LP vib amplitude & phase response during vib survey (slow accel, decel) or with steady-state dwell points • Balance achieved by spinner screw weight changes - 36 holes in aft spinner, 7 different screw sizes - Provides full range of adjustments CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 9 In-Service Vibration Team CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 10 N1 Vibration Team Objective • In May 2000 CFMI/Boeing and six airlines completed a study of in-service N1 vibration • 737NG operators reported increasing N1 vib levels and/or N1 vib shifts following trim balance. • Operators also expressed concern on maintenance guidelines and recommendations • CFMI reviewed the engine vibration levels, balance history, and pilot / maintenance crew reports for a fleet size of 240 engines, comprising ~2000 flight legs during a four month period. CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 11 In-service N1 vibration levels > 1.5 AVM units or tactile vibes and not resolved with current AMM procedures MANPOWER VIBRATION MEASUREMENTS FLIGHT ENVIRONMENT LP ROTOR HARDWARE HIGH Ranked Causes Cause & Effect Analysis What is about …. Fan Blade Seating Delivery Vib Levels Crew Training # Engine Cycles ACARS Data Collection LPT Blade Loss Icing Balance equipment Wide Chord Blade Flight Crew Reports AIRPLANE DELIVERY Platforms Engine thrust rating AMM PROCEDURES Guidelines FOD # Engine Hours Platform Seals Blade Lubrication Trim Balance Method Flightdeck display AVM Data Collection CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 12 N1 Vibration Status Background • Vibration variation impacts trim balance effectiveness • N1 Vibration is not common but has been reported in-service - Customers perform trim balance using AVM / relube at ~2 units - Effective in reducing vibration to less than 1 unit CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 13 N1 Vibration Status • Identified 2 prime factors for N1 vibe variation - Vibe variability due to blade / disk seating - Improved with G-n paste lube, introduced 05/00 in production - CESM 005 provides lubrication recommendation for N1 vibes - Vibe variability due to blade axial movement in disk - Creates a dynamic unbalance couple - Engine sensitive to dynamic unbalance couple -Elastomer buttons introduced to retention ring - May 2001 CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 14 Elastomer Buttons Rubber Button Aft View of Retention Flange Disk Spacer Retention Flange Blade Platform Retention Ring • Button installed in current holes in retention ring - limits blade axial travel - Easily retrofittable • S/B 72-325R1 introduced Elastomer Buttons - May 2001 CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 15 N1 Vibration Team Conclusions CESM 007 Recommendations: • Schedule fan trim balance when N1 vibration trend levels are above 1.5 – 2.0 units • Lubrication fan blades and disk slots provides benefit for reducing engine vibration levels. The re-lubrication method / timing is documented through CESM 005. • The recommended format for reporting N1 vibration related issues is included as an attachment to CESM 007.” CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 16 Summary of Fleet Experience • Typical engine vibration level at airplane delivery ~ 0.5 unit • N1 vibration level in-service average ~ 1.1 unit with various levels of trim balance activity • N1 vibration level increase 0.4 unit for every 2500 hrs (on average) • SAGE cruise trend data ~ 35% lower than max AVM flight history data levels • Threshold for crew reports of increased ~2 units vibration and/or airplane tactile vibration • Typical vibration reduction from AVM trim ~ 1.0 – 1.5 units balance • Engines identified with difficulty to be maintained 3 engines (vib level increased within ~ at low vibration levels 1 month after fan balance) • Fan blade re-lubrication Provides benefit in reducing / maintaining N1 vibration levels LP Vibration Team Findings CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 17 Other contributors to Vibration -Fan Blade Platform Balance Weights vary in size Not All Fan Blade Platforms require a Balance Weight •The loss of fan blade platforms seals or balance weights can contribute to engine unbalance •Field experience revealed an immediate 1 to 2 unit increase N1 indicated vibration when a balance weight or platform seal is missing •Maintenance manual revised recommending platform seal lubrication before installation Platform Seals CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 18 •Currently evaluating benefit of 2 plane trim on CFM56-7B production engines -Fan trim balance performed to reduce N1 engine vibe levels and N1 audible noise and tactile vibration (A&T) -Currently assessing benefit of 2 plane trim balance for N1 A&T levels -2 plane trimmed (as req’d) at CFMI starting December, 2001 GE 888-769, SN 889-854 and up -Boeing Flight line evaluation in progress -CFMI All OPS Wire issued Dec 2001 -S/B 72-0347R1 introduced LPT Stage 4 clips -Test Cell Experience -TRF Vibes 1.69 => 1.28 mils avg, LPT unbalance 250 => 100 gmcm avg (75% engines receive clips) 2 Plane Trim Balance Evaluation - Production Engines CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 19 • It is not intended that Operators will perform two plane trim balance in-service - CFM56 experience shows that CFM56-3 operators did not perform two plane trim balance in-service. - Two plane trim balance on the CFM56-7B is more complicated due to the longer exhaust nozzle making clip installation more difficult • There is no action recommended or required for inservice CFM56-7B engines delivered with LPT balance clips - If clips are observed to be missing in-service, it is not necessary to reinstall the clips - If clips are observed on an LPT at overhaul, it is recommended to leave clips installed unless LPT module balance is to be conducted 2 Plane Trim Balance - In-Service Engines CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 20 Summary • CFM56 Production engines are delivered with vibration levels less than 2.5 mils DA - typically ~ 1.0 mils DA - Engine durability demonstrated at vibration levels over 5 units • N1 Vibration team formed which included six airline customers - Conclusions from the team are published in CESM 007 - Performing periodic trim balances in addition to lubricating fan blade roots and fan disk slots is a effective method for retaining low LP vibration levels CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 21 Summary (Continued) • Additional actions taken: - Introduced new fan blade lubrication into production process May 2000 (GN Paste) - Introduced elastomer buttons into production May 2001 to limit fan blade axial travel - Improves N1 vibration variation - Evaluating the benefits of 2 plane balancing on production engine deliveries at Boeing flight line to improve airplane comfort Engine vibration is not being reported as an in-service issue GE Aircraft Engines Engine Airborne Vibration Monitoring System Back-up Material CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 23 System Overview • Engine Architecture • AVM System • AMM Procedures CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 24 CFM56 Vibration Sensors FFCC (-7, -5C) TRF (-2,-3,-5A,-5B ) CFM56-7B # 1 Brg (all) CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 25 737 Classic vs NG General Info Classic NG Engine CFM56-3 CFM56-7B Fan Blade Design Mid Span Shroud Wide Chord Engine Bearings 1B,2R,3B,4R,5R(ODB) Same, but also 3B+3R Isolators Fwd & Aft Mts, T/R None AVM Scale 0-5 Units (20 mils DA) Same Vib Sensors # 1 Brg and TRF #1 Brg and FFCC N1 Vibration Engine Balance Provision FAN and LPT Same Flight Line Trim Process FAN/LPT trim with in-flt data Fan trim using in-flt data N1 Vibe Peaks Hold and Climb (max) Same Vibe Endurance 21 mils da (+5 units) 27 mils da (+5 units) Maintenance Levels 7-10 mils da (3 units) Same Advisory Levels 14-15 mils da (4 units) Same Test Ship Limit 2.5 mils da 2.5 mils da Test Avg Level 1.5 mils da 1.0 mils da Overhaul Shop Limit 2.5 mils da 2.5 mils da CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 26 CFM56-7 LP Vib Response Characteristics (before trim balance) * Response peaks at 3000 rpm and 4200 - 5200 rpm (similar to CFM56 family) * Engine easily fan trim balance to low levels for improved comfort #1Brg FFCC Peak at ~3000 rpm Near hold power Peak at 4200 - 5200 rpm Climb and cruise range CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 27 737NG / CFM56-7 AVM Functions • AVM System Functions - Display engine vibration 1/rev N1 and N2 levels in flight deck - Record engine vibration flight history data - Record engine LP rotor balance data, calculate trim balance solutions • AVM System Description - 2 accelerometers per engine (#1Brg and FFCC) - LP and HP rotor speed signals, each engine - 1 AVM signal conditioner per airplane - Two vibration indicators in flight deck - 1 indicator for each engine - CDS displays 1 value, max level (in units) of 4 parameters - Max of #1Brg or FFCC, fan/rev or core/rev vib level CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 28 AVM and AMM Terminology • “Fan” Number 1 Brg sensor N1 Vibration - Sensitive to fan unbalance • “HPC” Number 1 Brg sensor N2 Vibration - Sensitive to HP rotor unbalance • “HPT” FFCC N2 Vibration - Sensitive to HP rotor unbalance • “LPT” FFCC N1 Vibration - Sensitive to fan and LPT unbalance CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 29 AVM Balance Method • AVM Monitors #1Brg, FFCC response continuously during flight • Stores up to 6 balance data points based on speed ranges, stability criteria • Stored balance data used post-flight to provide balance solution • AVM box provides recommendations for spinner wieght change to balance engine 6 AVM defined speed ranges for balance data collection Typical #1Brg in-flight response AVM stored balance data 1000 2000 3000 N1 Spe4e0d00 5000 1.2 327 1.1 5 0.9 63 0.8 53 0.5 57 0.7 49 1.6 20 1.5 36 1.1 82 1.2 64 0.8 19 0.5 51 Speed Range %N1 Fan (mils / degrees) LPT (mils degrees) 1 2 3 4 70 65 5 6 95 90 85 80 Location Remove Install 27 P02 P05 28 P05 P06 29 P02 P06 32 P07 P05 AVM provides straightforward instructions for balance screw changes CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 30 737NG LP Vibration AVM Scales 0.0 1.0 2.0 3.0 4.0 5.0 AVM Scalar Units #1Brg -- mils DA #1Brg (-113, -213) #1Brg (-114) 0. 5. 10. 15. 20. 0.0 1.0 2.0 3.0 4.0 5.0 AVM Scalar Units FFCC -- mils DA FFCC (-113, - 213) FFCC (-114) • AVM scales changed with introduction of -114 AVM (Oct ‘99) • Provides same scaling for both sensors for LP vibration • 1 unit = 2.5 mils DA (CFMI ship limit at production, overhaul) • At recommended maintenance levels •Same scaling for #1Brg (-113, -213, -114) •Slightly more conservative for FFCC with -114 • No change in max scale values ( 5 units = 20 mils DA) • Refer to Boeing Service Letter 737-SL-77-015-C for additional AVM details 0. 5. 10. 15. 20. Typical delivery levels Recommended maintenance levels Typical delivery levels Recommended maintenance levels CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 31 AMM PROCEDURES - Current vibration AMM recommendations 1- Vibration Guideline AMM 71-00-00 •If indicated vibration levels are between 3 and 4 units : action at airline policy •If indicated vibration is above 4 units with other parameters Normal perform the following: a/ Routine inspection FIM 71-05 (FOD…) b/ AVM download: engine removal if vibs source is N2 engine trim balance if vibs source is N1 note: refer to Boeing Fault Isolation Manual Chapter 71-05 2- Maintenance Manual Current trim balance method •The Three shot plot procedure AMM 71-00-00 ( test 14A) Prefered method •The On Board Procedure AMM 71-00-00 ( test 14B) CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 32 AA CFM56-7 Vibration vs. EVM 0 0.5 1 1.5 2 2.5 3 3.5 1 4 7 10 13 16 19 22 25 28 31 Engines Vibration Levels Incoming 90% N1 Out going 90% N1 using EVM On wing Hold AA Max Goal 4.0 AMM Max Limit CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 33 AA CFM56-7 Vibration vs. EVM 0 0.5 1 1.5 2 2.5 3 3.5 1 4 7 10 13 16 19 22 25 28 31 Engines Vibration Levels Incoming 90% N1 Out going 90% N1 using EVM On wing Hold AAMax Goal 4.0 AMM Max Limit CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 34 American Transair ESN Date ETSN ECSN A/C # A/C Pos. LOC Symptom Delay CAX Narrative 888617 10/25/01 50 26 N309 1 IND Engine Vibrations No No Pilot Reported VIBS and Strange Noise During Cruise - Inspected by Maint - No Faults Found 888617 11/28/01 237 128 N309 1 IND Engine Vibrations No No Pilot Reported VIBS (.8 - 1.1 units) and Audible Beat During Cruise - Maint Fan Trimmed Fan B Check done on 11/5/02 at TSN/CSN 3271/1677 888470 3/16/02 1885 949 N304 2 IND Engine Vibrations No No Pilot Observed 2.6 Units Vibration - Felt Vibrations Throughout Aircraft - Maint. Trim Balanced Fan B Check done on 8/4/02 at TSN/CSN 3174/1538 888356 6/5/02 2873 1387 N301 1 MDW Engine Vibrations No No Performed Trim Balance - Rearranged 5 Balance Screws B Check done on 7/10/02 at TSN/CSN 3177/1546 889398 1/3/03 4498 2266 N302 2 MDW Engine Vibrations No Yes - 2 flights A/P vibration throughout flight - Engine vibs at 2.05 units - Fan trimmed engine B Check done on 7/21/02 at TSN/CSN 3108/1559 888527 2/2/03 4284 2171 N305 2 IND Engine Vibrations No No PP Engineering requested troubleshooting for LPT vibs above 3 units - Performed fan trim balance B Check done on 9/30/02 at TSN/CSN 3319/1727 Note: 3 engines needed fan trim balance before B check, while 2 engines required trim balance after B check CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 35 WLineesAtPJeDtateFliESgNhtploisnn eNEumxSqpwkseart_iseqwnk cavem_sqwk AVM Bal PBS Relube Bld Change 851 YB301 May-01 888366 1 0 851 YB301 May-01 888367 2 1 1 1 1 872 YB302 Jun-01 888413 1 2 1 1 1 1 1 872 YB302 Jun-01 889392 2 0 905 YB303 Jul-01 888483 1 0 905 YB303 Jul-01 888484 2 0 1009 YB304 Nov-01 888690 1 1 1 1009 YB304 Nov-01 888693 2 2 2 1 1 1044 YB305 Dec-01 888755 1 0 1044 YB305 Dec-01 889758 2 0 1155 YB306 Jun-02 889993 1 1 1 1 1155 YB306 Jun-02 889994 2 0 1179 YB307 Jul-02 890145 1 0 1179 YB307 Jul-02 890146 2 0 1 1206 YB308 Aug-02 891203 1 1 1 1 1206 YB308 Aug-02 891200 2 0 1216 YB309 Sep-02 890224 1 1 1 1 1216 YB309 Sep-02 890225 2 1 1 1 1222 YB601 Sep-02 890239 1 0 1222 YB601 Sep-02 890240 2 0 1239 YB602 Oct-02 891269 1 1 1 1239 YB602 Oct-02 890271 2 2 2 1 1 1 1246 YB603 Nov-02 890282 1 1 1 1246 YB603 Nov-02 891283 2 1 1 1 1254 YB604 Nov-02 891292 1 0 1254 YB604 Nov-02 890299 2 0 1258 YB310 Dec-02 891306 1 0 1 1258 YB310 Dec-02 890308 2 1 1 1 1266 YB605 Dec-02 890320 1 0 1266 YB605 Dec-02 890325 2 0 1281 YB606 Feb-03 890357 1 0 1 1281 YB606 Feb-03 890362 2 0 1286 YB607 Feb-03 890369 1 1 1 1 1286 YB607 Feb-03 890370 2 3 3 2 2 1 1 1303 YB608 Mar-03 890403 1 0 1303 YB608 Mar-03 890404 2 0 Total 20 19 3 16 4 3 1 Overall Experience 42% Squawk Rate 11% Repeat rate 3 engines with re-lubes 1 engine with fan blade set change CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 36 WestJet In-service Experience 0 1000 2000 3000 4000 5000 6000 7000 0 1 2 3 4 5 6 7 8 16 engines with > 2000 hours • 3 engines fan trim balanced in-service • 1 engine balanced twice (3800, 5900 hours) • Causes for trim balance activity • Flight crew reports of 1.5 - 1.8 units (2x) • RD Cruise trend data observed trending above 1.5 units (2X) 4 engines with flightline repeat squawks • 2 > 5000 hours, 2 < 1500 hours • Not trim balanced in-service Current Engine ETSN status CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 37 WestJet In-service Fan Trim / Relube Experience Fltline In-service Line AP Date ESN Pos Sqwks ETSN Re-Lube Fan Trim Comments 851 YB301 May-01 888366 1 0 6512 1 0 1500 cycle relube 851 YB301 May-01 888367 2 1 6512 2 2 1500 cycle re-lube, platform disbond-->1st trim at 3800 hrs, 2nd trim at 5900 hrs 872 YB302 Jun-01 888413 1 2 6432 1 0 1500 cycle relube 872 YB302 Jun-01 889392 2 0 6432 1 0 1500 cycle relube 905 YB303 Jul-01 888483 1 0 6031 1 0 replaced a blade pair at 3900 hrs for damage 905 YB303 Jul-01 888484 2 0 6031 1 1 1st fan trim at 4300 hrs for 1.5 units 1009 YB304 Nov-01 888690 1 1 5140 1 0 1500 cycle relube 1009 YB304 Nov-01 888693 2 2 5140 1 0 1500 cycle relube 1044 YB305 Dec-01 888755 1 0 4567 1 1 1st trim at 2900 hrs for 1.5 units 1044 YB305 Dec-01 889758 2 0 4567 0 0 1500 cycle re-lube? 1155 YB306 Jun-02 889993 1 1 3009 0 0 No reported fan trim / relube activity 1155 YB306 Jun-02 889994 2 0 3009 0 0 No reported fan trim / relube activity 1179 YB307 Jul-02 890145 1 0 2610 0 0 No reported fan trim / relube activity 1179 YB307 Jul-02 890146 2 0 2610 0 0 No reported fan trim / relube activity 1206 YB308 Aug-02 891203 1 1 2249 0 0 No reported fan trim / relube activity 1206 YB308 Aug-02 891200 2 0 2249 0 0 No reported fan trim / relube activity 1216 YB309 Sep-02 890224 1 1 1672 0 0 No reported fan trim / relube activity 1216 YB309 Sep-02 890225 2 1 1672 0 0 No reported fan trim / relube activity 1222 YB601 Sep-02 890239 1 0 1677 0 0 Birdstrike, no damage, no reported trim 1222 YB601 Sep-02 890240 2 0 1677 0 0 No reported fan trim / relube activity 1239 YB602 Oct-02 891269 1 1 1445 0 0 No reported fan trim / relube activity 1239 YB602 Oct-02 890271 2 2 1445 0 0 No reported fan trim / relube activity 1246 YB603 Nov-02 890282 1 1 1335 0 0 No reported fan trim / relube activity 1246 YB603 Nov-02 891283 2 1 1335 0 0 No reported fan trim / relube activity 1254 YB604 Nov-02 891292 1 0 1122 0 0 No reported fan trim / relube activity 1254 YB604 Nov-02 890299 2 0 1122 0 0 No reported fan trim / relube activity 1258 YB310 Dec-02 891306 1 0 1087 0 0 No reported fan trim / relube activity 1258 YB310 Dec-02 890308 2 1 1087 0 0 No reported fan trim / relube activity 1266 YB605 Dec-02 890320 1 0 0 0 No reported fan trim / relube activity 1266 YB605 Dec-02 890325 2 0 706 0 0 No reported fan trim / relube activity 1281 YB606 Feb-03 890357 1 0 407 0 0 No reported fan trim / relube activity 1281 YB606 Feb-03 890362 2 0 407 0 0 No reported fan trim / relube activity 1286 YB607 Feb-03 890369 1 1 299 0 0 No reported fan trim / relube activity 1286 YB607 Feb-03 890370 2 3 299 0 0 No reported fan trim / relube activity 1303 YB608 Mar-03 890403 1 0 6 0 0 No reported fan trim / relube activity 1303 YB608 Mar-03 890404 2 0 6 0 0 No reported fan trim / relube activity CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 38 ALineTAAP FligDatehtElSNineposEn xpNuem Sqrwksienact_sqwek avm_sqwk AVM Bal PBS Relube Bld Change 847 YD301 May-01 888356 1 847 YD301 May-01 888357 2 1 1 875 YD302 Jun-01 888417 1 1 1 875 YD302 Jun-01 889398 2 2 2 888 YD303 Jul-01 888440 1 888 YD303 Jul-01 888441 2 1 1 898 YD304 Jul-01 888459 1 898 YD304 Jul-01 888470 2 1 1 929 YD305 Aug-01 888524 1 1 1 929 YD305 Aug-01 888527 2 2 2 933 YD306 Aug-01 889536 1 4 4 933 YD306 Aug-01 888537 2 4 4 948 YD307 Sep-01 888567 1 948 YD307 Sep-01 888568 2 1 1 958 YD308 Sep-01 888586 1 958 YD308 Sep-01 888587 2 973 YD309 Oct-01 888617 1 973 YD309 Oct-01 888616 2 984 YD310 Oct-01 888637 1 984 YD310 Oct-01 888638 2 998 YD311 Nov-01 889682 1 1 1 1 998 YD311 Nov-01 888664 2 1 1 1 1002 YD312 Nov-01 889688 1 1002 YD312 Nov-01 888671 2 1024 YD313 Dec-01 889715 1 1 1 1 1024 YD313 Dec-01 889716 2 2 2 2 1 1 1035 YD314 Dec-01 888741 1 1 1 1 1 1035 YD314 Dec-01 888742 2 1054 YD315 Jan-02 888782 1 1 1 1 1054 YD315 Jan-02 888797 2 1059 YD316 Jan-02 888811 1 2 1 1 2 1 1 1059 YD316 Jan-02 888780 2 1081 YD317 Mar-02 888843 1 1081 YD317 Mar-02 888844 2 1 1091 YD318 Mar-02 888863 1 1 1 1 1091 YD318 Mar-02 888864 2 1 1 2 1106 YD319 Apr-02 888895 1 2 1 2 2 1 1106 YD319 Apr-02 888902 2 1110 YD320 Apr-02 888889 1 2 2 2 1 1 1110 YD320 Apr-02 888903 2 1 1 1 1123 YD321 May-02 888928 1 1123 YD321 May-02 888929 2 1135 YD322 May-02 888951 1 1 1135 YD322 May-02 889956 2 1 1 1 1 1149 YD323 Jun-02 888978 1 1 1149 YD323 Jun-02 888977 2 1 1 1 1163 YD324 Jun-02 890115 1 1 1 1 1 1163 YD324 Jun-02 891108 2 1181 YD325 Jul-02 891147 1 3 3 1 3 2 1 1181 YD325 Jul-02 891148 2 2 2 2 1 1 1184 YD326 Oct-02 890156 1 1184 YD326 Oct-02 890157 2 1 1 1 1197 YD327 Nov-02 890184 1 1197 YD327 Nov-02 891187 2 1 1 1 1 1201 YD328 Nov-02 891193 1 1201 YD328 Nov-02 891194 2 1 1 1 1207 YD329 Nov-02 890205 1 1207 YD329 Nov-02 890206 2 1 1 1 1212 YD330 Dec-02 890209 1 1212 YD330 Dec-02 890215 2 2 2 2 1 1113 YD391 Apr-02 888906 1 1113 YD391 Apr-02 888907 2 Overall Experience 52% Squawk Rate 18% Repeat rate 6+ engines with re-lubes ? engine with fan blade set change CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 39 ATA In-service Experience 0 1000 2000 3000 4000 5000 6000 0 1 2 3 4 5 6 7 8 Current Engine ETSN status 50 engines with > 2000 hours • 5 engines fan trim balanced in-service • 1 engine balanced twice (50, 237 hours) - no additional maintenance to 4400 hours • Causes for trim balance activity • Flight crew reports of 1.1 - 3 units, audible noise 10 engines with flightline repeat squawks • All with > 2000 hours • 2 trim balanced in-service at 4300, 4500 hrs CFM56-7B Vibration Meeting, Dallas , June 2003 CFM Proprietary Data Unauthorized Disclosure Prohibited 40 ATA In-service Fan Trim Experience Fltline In-service AP ESN Pos ETSN Sqwks Fan Trim Comments YD301 888356 1 5350 0 1 Fan Trim at 2900 Hrs YD301 888357 2 5350 1 YD302 888417 1 5300 1 YD302 889398 2 5300 2 1 Fan Trim at 4500 hrs, pilot report 2.1 units YD303 888440 0 3076 0 YD303 888441 2 5121 1 YD304 888459 1 5231 0 YD304 888470 2 5231 1 1 Fan trim at 1900 hrs, pilot report 2.6 units, felt vibration YD305 888524 1 4759 1 YD305 888527 2 4759 2 1 Fan trim at 4300 hrs, Vibs reported > 3 units YD306 889536 1 4791 4 YD306 888537 2 4791 4 YD307 888567 1 4564 0 YD307 888568 2 4564 1 YD308 888586 1 4273 0 YD308 888587 2 4273 0 YD309 888617 1 4401 0 2 Fan trim at 50 hrs, 237 hrs, pilot report vibs 1.1 units, noise, no additional reports to 4400 hrs YD309 888616 2 4401 0 YD310 888637 1 4442 0 YD310 888638 2 4442 0 YD311 889682 1 4167 1 YD311 888664 2 4167 1 YD312 889688 1 4006 0 YD312 888671 2 4006 0 YD313 889715 1 4109 1 YD313 889716 2 4109 2 YD314 888741 1 3664 1 YD314 888742 2 3664 0 YD315 888782 1 3578 1 YD315 888797 2 3578 0 YD316 888811 1 3344 2 YD316 888780 2 3344 0 YD317 888843 1 3330 0 YD317 888844 2 3330 0 YD318 888863 1 3070 1 YD318 888864 2 3070 1 YD319 888895 1 2737 2 YD319 888902 2 2737 0 YD320 888889 1 2867 2 YD320 888903 2 2867 1 YD321 888928 1 2831 0 YD321 888929 2 2831 0 YD322 888951 1 2579 0 YD322 889956 2 2579 1 YD323 888978 1 2562 0 YD323 888977 2 2562 1 YD324 890115 1 2385 1 YD324 891108 2 2385 0 YD325 891147 1 2218 3 YD325 891148 2 2218 2 YD326 890156 1 1514 0 YD326 890157 2 1514 1 YD327 890184 1 1077 0 YD327 891187 2 1077 1 YD328 891193 1 1254 0 YD328 891194 2 1254 1 YD329 890205 1 1107 0 YD329 890206 2 1107 1 50 engines with > 2000 hours • 5 engines fan trim balanced in-service • 1 engine balanced twice (50, 237 hours) - no additional maintenance to 4400 hours • Causes for trim balance activity • Flight crew reports of 1.1 - 3 units, audible noise 10 engines with flightline repeat squawks • All with > 2000 hours • 2 trim balanced in-service at 4300, 4500 hrs

979199501 发表于 2011-4-12 14:23:39

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kinran 发表于 2011-6-4 23:36:31

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CFM56-7B N1 Vibration Discussions

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