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Airworthiness Directive 2021-22-11

recurring
Official AD 2021-22-11 · FR doc 2021-26332 · 2021-12-06 · 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 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. This AD was prompted by a report of a spiral crack in the pilot-to-copilot tail rotor torque tube (torque tube). This AD requires a one-time visual and recurring borescope inspections of the torque tube and depending on the results, removing the torque tube from service. The FAA is issuing this AD to address the unsafe condition on these products.

Repetitive inspection. Re-inspect every 300 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2021-22-11 applies to

MakesMd Helicopters Inc.
Models369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, 600N, 369
Part-conditional — 369H7531-9, 369H7531-11, 369H7531-13.

Applies only to helicopters with pilot-to-copilot tail rotor torque tube part number 369H7531-9, -11, or -13 installed.

Whether AD 2021-22-11 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 2021-22-11 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.