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Airworthiness Directive 2021-26-06

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Official AD 2021-26-06 · FR doc 2022-00049 · 2022-01-11 · turbine engine

Airworthiness Directives; General Electric Company Turbofan Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) GE90 model turbofan engines. This AD was prompted by two separate in-flight shutdowns (IFSDs) resulting from failure of the transfer gearbox (TGB) radial bevel gear (TGB radial gearshaft). This AD requires visual inspection of the TGB radial gearshaft and, depending on the results of the inspection, replacement of the TGB radial gearshaft. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-26-06 applies to

MakesGeneral Electric Company
ModelsGE90-76B, GE90-85B, GE90-90B, GE90-94B, GE90-110B1, GE90-115B, GE90

Applies only to engines with a transfer gearbox (TGB) radial bevel gear (TGB radial gearshaft) having a serial number listed in paragraph 4, Appendix A, Table 1 of GE90 SB 72-1201 R01 (dated April 28, 2021), or paragraph 4, Appendix A, Table 1 of GE90-100 SB 72-0857 R01 (dated April 28, 2021).

Whether AD 2021-26-06 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:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 2021-26-06 complied with on your aircraft?

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.