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Airworthiness Directive 2020-18-20

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Official AD 2020-18-20 · FR doc 2020-20930 · 2020-09-23 · airframe

Airworthiness Directives; MD Helicopters Inc. (MDHI), Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain MD Helicopters Inc. (MDHI) Model 369A, 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. This AD was prompted by reports of abrasion strips departing the main rotor (MR) blade in- flight. This AD requires tap inspecting each MR blade leading edge abrasion strip. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2020-18-20 applies to

MakesMd Helicopters Inc.
Models369A, 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, 600N, 369
Part-conditional — 500P2100-105, 500P2100-305, 500P2300-505, 369D21120-505, 369D21121-505, 369D21123-505.

Applies only to helicopters with the specified main rotor (MR) blade P/N installed with a 1.25 inch chord length nickel abrasion strip manufactured or installed by Helicopter Technology Company, LLC (HTC), or where the manufacturer of the abrasion strip is unknown. Does not apply if the abrasion strip has accumulated 700 or more hours time-in-service (TIS).

Whether AD 2020-18-20 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 2020-18-20 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.