![2 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024
LEAP-1B Fleet Scorecard (12 month rolling average)
99.95 % On time
departure per 1,000
flight departures
- 99.9 %
- 99.7 %
0.0050 event(s) per
1,000 flight
departures
- 0.020
- 0.010
0.0401 event(s)
per 1,000 flight
hours
- 0.100
- 0.070
0.0020 event(s)
per 1,000 flight
hours
- 0.010
- 0.005
24.0 Person-
hr/engine/yr
- 20
- 17
0.0180 event(s) per
1,000 flight
departures
- 0.100
- 0.050
1626
TAILS
3636
ENGINES
420
SPARES
88
OPERATORS
Total fleet hours/cycles 22,943,532/9,040,934
Fleet hours/cycles per month 985,891/388,506
Fleet Leader hours/cycles 18,232/7,198
[Total rate] [Total rate]
[Total rate]
[Total rate]
[Basic rate]
*Data through August 31st, 2024
[Total MBI]
Key Issues
HPT Stg 1 Blade – Removals increasing due to trailing edge distress. Reduced
inspection interval SB 72-0366 for MENA region. HPT hardware durability
improvement redesign underway. Testing 2024-25; MRO intro 2026; Prod to follow
FuelNozzle Coking – CNRs for replacement of fuel nozzles. Reverse Bleed selected
as Product Improvement. Development & cert testing underway; Cert & Prod 2Q ‘25
Fan Blade Repairs/Limits – Fan Blades sent to repair Shop due to findings on-
wing/in Shop. Criteria/Repair plan developed to address most frequent findings
Combustordistress – Distress seen during MPD BSI. AMM limits being revised. DR
for re-inspection available for most cases. Root cause identified : C-seal change
introduction targeted 2Q’25
ODMS False Chip Counts – Repetitive CNRs for false chip counts (no debris/fuzz on
ODMS sensor), mostly due to interference between ignition system and ODMS
system. SB 79-0012 introduced new aluminum air/oil separator for weight saving
with side benefit of electric flux resistance in production 1Q’23](https://image.slidesharecdn.com/1-250730201205-b2fbe523/85/LEAP-1B-presedntation-xxxxxxxxxxxxxxxxxxxxxxxxxxxxx-2-320.jpg)
LEAP-1B presedntation xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
- 1. CFM, CFM56, LEAP and the CFM logo are trademarksof CFM International,a 50/50 jointcompany between SAFRANAircraftEngines and GE. The information in this documentis CFM Proprietary Informationand is disclosedin confidence. Itis the propertyof CFM International and its parentcompanies, and shall not be used, disclosed toothers or reproducedwithoutthe expresswritten consent of CFM. If consent is given for reproductionin wholeor in part, thisnotice shall appearin any such reproductionin wholeor in part. Theinformation contained in thisdocument may also be controlled by theU.S. and French export control laws. Unauthorized exportor re-exportis prohibited. LEAP-1B / 737 MAX WTT Houston, TX USA – October 8-10, 2024 LEAP-1B Fleet Reliability – Scorecard Bryan TINKER Pascal MORLOT
- 2. 2 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 LEAP-1B Fleet Scorecard (12 month rolling average) 99.95 % On time departure per 1,000 flight departures - 99.9 % - 99.7 % 0.0050 event(s) per 1,000 flight departures - 0.020 - 0.010 0.0401 event(s) per 1,000 flight hours - 0.100 - 0.070 0.0020 event(s) per 1,000 flight hours - 0.010 - 0.005 24.0 Person- hr/engine/yr - 20 - 17 0.0180 event(s) per 1,000 flight departures - 0.100 - 0.050 1626 TAILS 3636 ENGINES 420 SPARES 88 OPERATORS Total fleet hours/cycles 22,943,532/9,040,934 Fleet hours/cycles per month 985,891/388,506 Fleet Leader hours/cycles 18,232/7,198 [Total rate] [Total rate] [Total rate] [Total rate] [Basic rate] *Data through August 31st, 2024 [Total MBI] Key Issues HPT Stg 1 Blade – Removals increasing due to trailing edge distress. Reduced inspection interval SB 72-0366 for MENA region. HPT hardware durability improvement redesign underway. Testing 2024-25; MRO intro 2026; Prod to follow FuelNozzle Coking – CNRs for replacement of fuel nozzles. Reverse Bleed selected as Product Improvement. Development & cert testing underway; Cert & Prod 2Q ‘25 Fan Blade Repairs/Limits – Fan Blades sent to repair Shop due to findings on- wing/in Shop. Criteria/Repair plan developed to address most frequent findings Combustordistress – Distress seen during MPD BSI. AMM limits being revised. DR for re-inspection available for most cases. Root cause identified : C-seal change introduction targeted 2Q’25 ODMS False Chip Counts – Repetitive CNRs for false chip counts (no debris/fuzz on ODMS sensor), mostly due to interference between ignition system and ODMS system. SB 79-0012 introduced new aluminum air/oil separator for weight saving with side benefit of electric flux resistance in production 1Q’23
- 3. 3 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 Fleet Age Chart TSN Range CSN Range
- 4. 4 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 In Flight Shut Downs (IFSD) (12 month rolling average) Cause Status Control Program Corrective Action Under Investigation - 3 turbomachinery failure w/ HPT section distress → Pending engine induction in Shop for investigation - 2 Low Oil Pressure indication → Pending hardware investigation at OEM TBD TBD OPT Sensor OPT sensors internal failure confirmed (wire broken) TBD Production process improvement in place since 2019 Lube Unit - Quality escape on insufficient housing wall thickness - Root cause undetermined by investigation – Isolated case - Affected population removed from service - N/A - Production process improvement in place - N/A 3R Bearing Closed - Root Cause Analysis completed: #3R bearing damage at installation in Shop Shop procedures clarified to prevent heating #3R inner ring/rollers at installation, and inspection after assembly ESM updated PSS O-ring Closed - PSS O-ring damaged (maintenance) Awareness / AGB Roller bearing ovalization suspected – Pending indication in Shop for investigation Bearing particles detection by ODMS Roller bearing design improvement – 3Q25
- 5. 5 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 Aborted Takeoffs (ATO) (12 month rolling average) Cause Status Control Program Corrective Action Fuel Pump Relief Closed CNR for fuel pump relief in place since Sept 2024 EEC SW v7.1 Introduces Improved fuel schedules (2Q'25) Reverse Bleed System – planned 2Q’25 Investigation pending Turbomachinery failure w/ HPT section distress → Pending engine induction in Shop for investigation TBD TBD
- 6. 6 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 Flight Interruptions (ATB, DIV) (12 month rolling average) Cause Status Control Program Corrective Action TCF accelerometer Under investigation CNR for TCF noise detection and proactive maintenance under evaluation TBD HPC lock ring Root Cause identified N/A Design change approved Assembly improvement: production procedure updated / ESM procedure being updated (MRO shops notified) Oil Cap O-ring Closed Awareness SB 79-0016 introducing new oil tank cap design A-Sump silver particles Closed CNR for Silver flakes Production process improvement in place since June 2019 Oil Leak – C Sump Pending engine induction in Shop for investigation TBD TBD Starter Turbine Seal Distress Unable to determine primary root cause due to condition of hardware TBD Note: Data does not include interruptions associated with IFSD events
- 7. 7 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 Engine Removals (12 month rolling average) Cause Status Control Program Corrective Action HPT Stage 1 Shroud Closed Diagnostic analytic and CNR for EGT loss SB 72-0218/0303 - P02/P04 Hermetic Shroud LLP Closed Closed populations affectedby material Quality Escape addressed by SBs / HPT Stg1 Blade In Region Distress MENA reduced inspection SB 72-0366 issued Hardware redesign in work…planned 2026 Mixer Retainer Closed Awareness – Damaged at Fuel Nozzle replacement 600 cycles CIS available (with conditions) Reverse Bleed System – planned 2Q’25 / New mixer retainer design under evaluation Low EGT Margin Closed Diagnostic analytic and CNR for EGT loss New HPT Stage 1 Shroud design to mitigate EBC spall and associated EGT loss Top 5 Contributors
- 8. 8 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 Departure Reliability (D&C) (12 month rolling average) Top 5 Contributors Cause Status Control Program Corrective Action Spurious Fault Closed Follow IFIM when fault appears None Igniter Under investigation TBD – recommend providing experience to CFM Operator specific ignitor replacement interval Fan Abradable Secondary Distress / / ODMS Fuzz on ODMS sensor ODMS sensor faults False chip count None None CNR for false chip count under evaluation None None SB 79-0012 introducing new Air Oil Separator
- 9. 9 / CFM Proprietary Information subject to restrictions on the cover LEAP-1B/ 737 MAX WTT – October8-10, 2024 Maintenance Burden Index Person- hours/engine/1000 FH Cause Maintenance Burden Way forward CNR: Fuel Nozzle Coking Proactive CNRs recommending set replacement Reverse Bleed System selected as Product Improvement – intro planned 2Q’25 Cat 2 SB: PSS Vacuum, PS3/P3B Blowout Procedures Repetitive dry-out procedure of PSS/PS3 system every 750 hours PSS heater 3Q’25 Cat 2 SB : HPT Flowpath inspection for MENA region Repetitive inspections of HPT flowpath every 150 cycles Hardware redesign in work… expected2026 Cat 2 SB: TGB Scavenge screen inspections Repetitive inspection of screens every 50 hrs RDS BSI with no findings can clear repetitive inspection after minimum 5750 hours. New design released September2019 MPD Water wash CEOD Engine Change Service Bulletin CNR MB Category MBI Hours Baseline 9.0 SB 3.5 CNR 3.8 Engine Change 7.6 Total Maintenance Burden 24.0
- 10. 10 / CFM Proprietary Informationsubject to restrictions on the cover Thank you