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Airworthiness Directive 80-12-51 R2

one-time
AD 80-12-51 R2 · 1980-01-01 · turbine engine

Airworthiness Directives; approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region. If any crack indications are found, the blad

Which aircraft AD 80-12-51 R2 applies to

MakesPratt & Whitney
ModelsJT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-1A, JT3D-1A-MC6, JT3D-1A-MC7, JT3D-3, JT3D-3B, JT3D-3C, JT3D-5A, JT3D-7, JT3D-7A, JT3D

Blade inspection method must be approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region; if any crack indications are found, the blade must be removed from service prior to further flight. Effective July 1, 1980.

Whether AD 80-12-51 R2 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 80-12-51 R2 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.

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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.