Is AD 2007-09-51 a recurring Airworthiness Directive?

No — AD 2007-09-51 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2007-09-51 apply to?

AD 2007-09-51 applies to Md Helicopters — models 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2007-09-51

one-time

Official AD 2007-09-51 · FR doc E7-11409 · 2007-06-19 · airframe

Airworthiness Directives; MD Helicopters, Inc., Model 369, YOH-6A, 369A, OH-6A, 369H, 369HM, 369HS, 369HE, 369D, 369E, 369F, and 369FF Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2007-09-51, sent previously to all known U.S. owners and operators of the specified MD Helicopters, Inc. (MDHI), model helicopters by individual letters. This AD requires, before further flight, removing each affected tail rotor blade assembly and inspecting the bore of the tail rotor blade root fitting. If the blade assembly does not have a smooth radius, the AD requires replacing it. The AD also requires identifying each airworthy tail rotor blade assembly with the applicable helicopter model. This amendment is prompted by a report of an accident after the loss of a tail rotor blade. The actions specified by this AD are intended to prevent the failure of a tail rotor blade and subsequent loss of control of the helicopter.

Which aircraft AD 2007-09-51 applies to

MakesMd Helicopters

Models369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, OH-6A, YOH-6A, OH-6

Part-conditional — 369A1613, 369D21606, 369D21613, 369D21615, 421-088.

Applies only when a tail rotor blade P/N 369A1613, 369D21606, 369D21613, 369D21615, or 421-088 (all dash numbers) is installed.

Whether AD 2007-09-51 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 2007-09-51 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.