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
•roduction 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

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