AD 2015-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International S | Airworthiness Directives; CFM International S.A. Turbofan Engines |
Unsafe Condition
Rupture of the 73-tooth gearshaft located in the engine AGB, which could lead to failure of certain AGB gearshafts, one or more engines, loss of thrust control, and damage to the airplane.
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Required Actions
Perform AGB/TGB MCD inspections and analyses as specified, remove affected gearshafts if particles are detected, and do not install affected gearshafts into an AGB after the effective date.
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Compliance Time
Within 25 flight hours from the effective date or as specified by flight hour accumulation thresholds.
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Affected Aircraft
CFM International S.A. CFM56-7B and CFM56-3 engines with a 73-tooth or 41-tooth gearshaft installed in the accessory gearbox (AGB), with gearshaft serial numbers in Appendix A or Appendix B of CFM Service Bulletin No. CFM56-7B S/B 72-0964, Revision 1.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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