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Airworthiness Directive 2018-23775

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AD 2018-23775 · 2018-11-05 · turboprop engine

Airworthiness Directives; Honeywell International Inc. Turboprop Engines

What this AD requires

We are superseding Airworthiness Directive (AD) 88-12-10 for certain Honeywell International Inc. (Honeywell) TPE331 turboprop engines. AD 88-12-10 required reducing the life limit for certain second stage turbine rotors. This AD requires removing certain second stage turbine rotors from service at a reduced life limit. This AD was prompted by report that a TPE331-11U engine experienced an uncontained rotor separation. In addition, cracks were discovered through eddy current inspection (ECI) in the bore of the second stage turbine rotor assembly after publication of AD 88-12-10. We are issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2018-23775 applies to

MakesHoneywell International Inc.
ModelsTPE331-8, TPE331-10, TPE331-10N, TPE331-10R, TPE331-10U, TPE331-10UA, TPE331-10UF, TPE331-10UG, TPE331-10UGR, TPE331-10UR, TPE331-11U, TPE331
Part-conditional — 3102106-1, 3102106-6, 3102106-8, 3101514-1, 3101514-10, 3101514-12.

Applies only to engines with second-stage turbine rotor assembly P/N 3102106-1, -6, or -8, or P/N 3101514-1, -10, or -12, installed.

Whether AD 2018-23775 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

Supersession

Supersedes AD 88-12-10.

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 2018-23775 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.