Airworthiness Directive 2015-18-04
one-timeAirworthiness Directives; CFM International S.A. Turbofan Engines
What this AD requires
We are adopting a new airworthiness directive (AD) for certain CFM International S.A. (CFM) CFM56-7B and CFM56-3 turbofan engines. This AD was prompted by a report of an uncommanded in-flight shutdown (IFSD) on a CFM CFM56-7B engine following rupture of the 73-tooth gearshaft located in the engine accessory gearbox (AGB). This AD requires AGB/transfer gearbox (TGB) magnetic chip detector (MCD) inspection of the affected gearshafts until removal. We are issuing this AD to prevent failure of certain engine AGB gearshafts, which could lead to failure of one or more engines, loss of thrust control, and damage to the airplane.
Which aircraft AD 2015-18-04 applies to
Applies only to engines with a 73-tooth or 41-tooth gearshaft installed in the accessory gearbox (AGB) having a gearshaft serial number listed in Appendix A or Appendix B of CFM Service Bulletin No. CFM56-7B S/B 72-0964, Revision 1, dated December 15, 2014.
Whether AD 2015-18-04 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.