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Airworthiness Directive 2020-19-04

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Official AD 2020-19-04 · FR doc 2020-19906 · 2020-09-10 · airframe

Airworthiness Directives; Leonardo S.p.a. Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Leonardo S.p.a. (Leonardo) Model AB139 and AW139 helicopters. This AD requires removing certain main gearbox (MGB) input modules from service. This AD was prompted by the discovery that a batch of duplex bearings, which are installed on the MGB input modules, are defective. The actions of this AD are intended to address an unsafe condition on these products.

Which aircraft AD 2020-19-04 applies to

MakesLeonardo S.P.A.
ModelsAB139, AW139
Serial-conditional — narrows to serials KHI-200–KHI-200.
Part-conditional — 3K6320A00135, 3K6320A00136.

Applies only to helicopters with main gearbox (MGB) input module P/N 3K6320A00135 with S/N KHI-200, or P/N 3K6320A00136 with an S/N listed in Table 1 to this paragraph (table not machine-readable from the source text, so those serial numbers could not be extracted), installed.

Whether AD 2020-19-04 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 2020-19-04 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.