CFM56-5B Performance Retention

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CFM56-5B
Performance
Retention
CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 2
CFM56-5B Performance Retention
• Analyzed Performance Retention for Asia/Pacific -5B
- Analysis based on SAGE takeoff data
- Received data from 5 operators / branches
- 40 aircraft / 80 engines
- High-time engines at ~8000 cycles since new (CSN)
• Identified Several SAGE Processing Issues
- Corrected results where possible
• Compared Results to World-Wide Fleet Average
Asia/Pacific Retention within Expected Range
CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 3
Comparison to World-Wide Fleet Average
CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 4
Observations
• SAGE Data Includes Two Adjustments
- SAGE 3.0.3 data reprocessed through latest SAGE version (4.1.0)
- Data reprocessed with nominal bleed flow
- Each of these changes improves EGT margin by 8 - 10o C
• Production Acceptance Margin used as Baseline
- Normally use SAGE initialization point
- Much of the SAGE data was initialized at high cycle times
- Appears to overstate early deterioration (sea level to on-wing)
• Cycles Since New Values May be Low
- Obtained from GE “SMART 2000” data base
- Provided through field reps (once per month)
- Several engines show step decrease in CSN during on-wing history
Last Two Items Increase Apparent Deterioration
CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 5
Cycles Since New
• Chart Shows Step in CSN
- ~ -1500 cycles in one month
- Unreported engine change?
- Bad data in SMART 2000?
- Error in CSN tracking?
• Similar Steps for Other ESNs
- Also periods of 6 months or more with flat CSN
• May Cause Error in Performance Retention Assessment
- Tends to increase indicated deterioration
• Correct CSN Tracking at Airline Critical
- To insure timely removal of life-limited parts
CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 6
Summary
• Examined Performance Retention for Asia/Pacific -5B
- Analysis of SAGE takeoff data from 80 engines
• Identified Several Data Issues
- SAGE version out of date
- Incorrect entry of bleed flow
- Initialization point in some cases years after installation
- Possible errors in CSN data
• Results Similar to World-Wide Fleet Average
- Data agrees within expected accuracy
Performance Retention Comparable to World Fleet

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CFM56-5B Performance Retention

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CFM56-5B Performance Retention