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Airworthiness Directive 2020-20-11

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Official AD 2020-20-11 · FR doc 2020-21450 · 2020-09-29 · 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) GEnx-1B64/P2, -1B67/P2, -1B70/P2, -1B70C/P2, -1B70/75/P2, -1B74/75/P2, -1B76/P2, -1B76A/P2, and GEnx- 2B67/P model turbofan engines. This AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life limits of certain high-pressure turbine (HPT) rotor stage 2 disks and a certain stages 6-10 compressor rotor spool. This AD requires the removal of certain HPT rotor stage 2 disk and the removal of a certain stages 6-10 compressor rotor spool before reaching their new life limits. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2020-20-11 applies to

MakesGeneral Electric Company (Ge)
ModelsGEnx-1B64/P2, GEnx-1B67/P2, GEnx-1B70/P2, GEnx-1B70C/P2, GEnx-1B70/75/P2, GEnx-1B74/75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, GEnx-2B67/P, GEnx-1B, GEnx-2B
Serial-conditional — narrows to serials TMT18D6T–TMT18D6T, TMT18D6U–TMT18D6U, TMT18JC4–TMT18JC4, TMT18NGC–TMT18NGC, TMT1985C–TMT1985C, TMT3UA34–TMT3UA34, TMT3UA55–TMT3UA55, TMT4CT46–TMT4CT46, TMT4CT47–TMT4CT47, GWN10ECM–GWN10ECM.
Part-conditional — 2383M86P02, 2628M56G01.

Applies only to engines with (1) HPT rotor stage 2 disk P/N 2383M86P02, having one of the following serial numbers: TMT18D6T, TMT18D6U, TMT18JC4, TMT18NGC, TMT1985C, TMT3UA34, TMT3UA55, TMT4CT46, or TMT4CT47, installed; or (2) stages 6-10 compressor rotor spool P/N 2628M56G01, S/N GWN10ECM, installed.

Whether AD 2020-20-11 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:

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 2020-20-11 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.