Airworthiness Directive 98-10-11
one-timeAirworthiness Directives; CFM International CFM56-3, -3B, -3C, - 5, -5B, and -5C Series Turbofan Engines
What this AD requires
This amendment adopts a new airworthiness directive (AD) that is applicable to CFM International CFM56-3, -3B, -3C, -5, -5B, and -5C series turbofan engines. This action supersedes telegraphic AD T97-25- 51 that currently requires removal of one engine from an aircraft, and replacement with a serviceable engine or replacement of parts, if both engines are equipped with a specific accessory gearbox (AGB) starter gearshaft or transfer gearbox (TGB) input bevel gear, and daily checks of the AGB/TGB magnetic chip detector. This amendment is prompted by further investigation that has revealed that certain TGB output bevel gears and AGB intermediate gear assemblies on CFM56-3, -3B, and -3C series engines, and AGB gearshaft cluster spur assemblies on CFM56-5, - 5B, and -5C series engines could also be affected. The actions specified by this AD are intended to prevent inflight engine shutdowns due to an AGB starter gearshaft, TGB input bevel gear, TGB output bevel gear, AGB gearshaft cluster spur assembly or AGB intermediate gear assembly failure.
Which aircraft AD 98-10-11 applies to
Applies to engines having any of the engine serial numbers (ESNs) identified in Table 1 of CFMI SB 72-863 Rev 1, SB 72-867, SB 72-873 Rev 1 (CFM56-3/-3B/-3C), SB 72-523 Rev 1 (CFM56-5), SB 72-211 Rev 1 (CFM56-5B), and SB 72-350 Rev 1 (CFM56-5C). Installed on but not limited to Boeing 737 series and Airbus A319, A320, A321, and A340 series aircraft.
Whether AD 98-10-11 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.