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for Asia/Pacific -5B - Analysis of SAGE takeoff data from 80 engines • Identified Several Data Issues - SAGE version out of date - Incorrect entry of bleed flow - Initialization point in some cases years after installation - Possible errors in CSN data • Results Similar to World-Wide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作者: kinran 时间: 2011-6-4 23:06:00
