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CFM56 Engine

CFM International · turbofan · 7,914 engine-system SDR reports · 55 ADs

18,500–34,000 lbfThrust
1974First Run
In production (spares); superseded by LEAPStatus
The best-selling commercial turbofan in history; powers the Boeing 737 Classic/NG and about half of the A320ceo fleet.Note

Reported engine systems (FAA SDR)

  • Engine - Turbine/Turboprop3,965 (50.1%)
  • Engine Fuel & Control1,957 (24.7%)
  • Engine Air695 (8.8%)
  • Engine Indicating435 (5.5%)
  • Engine Oil223 (2.8%)
  • Engine Exhaust169 (2.1%)
  • Starting156 (2%)
  • Ignition151 (1.9%)
  • Power Plant96 (1.2%)
  • Engine Controls53 (0.7%)
  • Other14 (0.2%)
Engine variants
VariantReportsYears
CFM56-7B5,4171999–2026
CFM56-36691995–2026
CFM56-5B8111999–2026
CFM56-5A3381995–2026
CFM56-22631995–2025
CFM56-5C291997–2024

Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).

Airworthiness directives

  • 2026-0033: Engine - High-Pressure Turbine Inner Stationary Seal - Inspection (2026-02-20)
  • 2024-06080: Airworthiness Directives; CFM International, S.A. Engines (2024-03-22)
  • 2024-0067-E: Engine - Life Limited Parts - Replacement (2024-03-09)
  • 2024-0002: Engine - High-Pressure Turbine Inner Stationary Seal - Inspection (2024-01-04)
  • 2023-07003: Airworthiness Directives; CFM International, S.A. Turbofan Engines (2023-04-05)
  • 2020-0261R1: Engine - Accessory Gearbox - Modification (2022-06-30)
  • 2022-04149: Airworthiness Directives; CFM International, S.A. Turbofan Engines (2022-03-01)
  • 2021-18165: Airworthiness Directives; CFM International, S.A. Turbofan Engines (2021-08-24)
  • 2021-10607: Airworthiness Directives; CFM International, S.A. Turbofan Engines (2021-05-20)
  • 2021-0062: Engine - Low Pressure Turbine Rear Frames - Inspection / Replacement (2021-03-05)
  • 2020-0261: Engine - Accessory Gearbox - Modification (2020-11-27)
  • 2020-0044: Engine - High-Pressure Turbine Inner Stationary Seal - Inspection (2020-03-03)
  • 2020-0007: Engine - Rotating Air High Pressure Turbine Front Seal - Replacement (2020-01-15)
  • 2019-0150: Engine - Rotating Air High Pressure Turbine Front Seal - Replacement (2019-06-28)
  • 2019-0146: SUPERSEDED BY EASA AD 2019-0150 (2019-06-21)
  • 2019-13040: Airworthiness Directives; CFM International S.A. Turbofan Engines (2019-06-20)
  • 2019-0018: Engine - Fan Blades - Inspection (2019-01-30)
  • 2018-27920: Airworthiness Directives; CFM International S.A. Turbofan Engines (2018-12-26)
  • 2018-21245: Airworthiness Directives; CFM International S.A. Turbofan Engines (2018-10-01)
  • 2018-0211: Engine - Fan Blades - Inspection (2018-09-28)
  • 2018-11027: Airworthiness Directives; CFM International S.A. Turbofan Engines (2018-05-23)
  • 2018-10657: Airworthiness Directives; CFM International S.A. Turbofan Engines (2018-05-17)
  • 2018-0109: Engine - Fan Blades - Inspection (2018-05-17)
  • 2018-09338: Airworthiness Directives; CFM International S.A. Turbofan Engines (2018-05-02)
  • 2018-0093-E: Engine - Fan Blades - Inspection (2018-04-20)
  • 2018-0071: Engine - Fan Blades - Inspection (2018-03-26)
  • 2017-0149R1: Engine - Variable Stator Vane Actuating System - Check (2017-12-05)
  • 2017-0149: Engine - Variable Stator Vane Actuating System - Check (2017-08-16)
  • 2017-14545: Airworthiness Directives; CFM International S.A. Turbofan Engines (2017-07-14)
  • 2017-0084: Engine - Radial Drive Shaft - Replacement (2017-05-12)
  • 2017-0065: Engine Fuel and Control - Hydro-Mechanical Units - Operational Limitations (2017-04-19)
  • 2017-04656: Airworthiness Directives; CFM International S.A. Turbofan Engines (2017-03-09)
  • 2016-17442: Airworthiness Directives; CFM International, S.A. Turbofan Engines Modified by Supplemental Type Certificate SE00034EN (2016-07-25)
  • 2016-0039: Engine - Low Pressure Turbine Rear Frames - Inspection / Replacement (2016-02-29)
  • 2016-01266: Airworthiness Directives; CFM International S.A. Turbofan Engines (2016-01-26)
  • 2015-26345: Airworthiness Directives; CFM International S.A. Turbofan Engines (2015-10-19)
  • 2015-0133: Engine - Accessory Gearbox Gearshaft - Inspection / Replacement (2015-07-08)
  • 2015-03582: Airworthiness Directives; CFM International S.A. Turbofan Engines (2015-02-24)
  • 2014-0261: Engine Fuel & Control - Engine Electronic Control - Software Update (2014-12-04)
  • 2014-0130: Time Limits - Engine Stationary Parts - Life Limits / Mandatory Inspections (2014-05-20)
  • 2014-0083: Engine - Repaired Low Pressure Turbine Stage 1 Nozzle Segments - Identification / Replacement (2014-04-02)
  • 2013-30862: Airworthiness Directives; CFM International S.A. Turbofan Engines (2013-12-30)
  • 2013-0183: Engine - Repaired Low Pressure Turbine Stage 1 Nozzle Segments - Identification / Replacement (2013-08-13)
  • 2013-17296: Airworthiness Directives; CFM International, S. A. Turbofan Engines (2013-07-30)
  • 2013-01360: Airworthiness Directives; CFM International, S.A. Turbofan Engines Modified by Supplemental Type Certificate SE00034EN (2013-01-28)
  • 2012-0209: Engine - Accessory Gearbox (AGB) Hand-Cranking Pad - Modification (2012-10-08)
  • 2012-0123: Engine Fuel and Control - Hydro-Mechanical Units - Operational Limitation (2012-07-09)
  • 2012-4285: Airworthiness Directives; CFM International S.A. Model CFM56 Turbofan Engines (2012-02-24)
  • 2012-2893: Airworthiness Directives; CFM International, S.A. Turbofan Engines (2012-02-09)
  • 2010-0212: Engine - Fan Blade - Replacement (2010-10-18)
  • 2009-0088R1: [Correction] Engine - High Pressure Compressor (HPC) - Inspection / Replacement (2010-08-17)
  • 2010-14819: Airworthiness Directives; CFM International, S.A. CFM56-5, -5B, and -7B Series Turbofan Engines (2010-06-21)
  • 2010-13432: Airworthiness Directives; CFM International, S.A. Models CFM56-3 and -3B Turbofan Engines (2010-06-08)
  • 2010-10177: Airworthiness Directives; CFM International, S.A. CFM56-5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B5/P, -5B6/P, -5B7/P, -5B8/P, -5B9/P, -5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/P1, -5B6/2P, -5B4/2P1, and -5B9/2P Turbofan Engines (2010-05-04)
  • E9-31043: Airworthiness Directives; CFM International, S.A. CFM56-7B Series Turbofan Engines (2010-01-14)

Occurrences naming this engine

255 occurrences, 2 fatal, 8 fatalities.

Engine-failure occurrences on aircraft using this engine

92 occurrences, 5 fatal, 321 fatalities.

These occurrences are engine-failure events on aircraft families that can be fitted with this engine; the engine type of each specific aircraft is not confirmed. Do not read this list as a record for this engine.

Applications