Is AD 2005-21-02 a recurring Airworthiness Directive?

No — AD 2005-21-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2005-21-02 apply to?

AD 2005-21-02 applies to Md Helicopters — models 369D, 369E, 369F, 369FF, 500N, 600N, 369. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2005-21-02

one-time

Official AD 2005-21-02 · FR doc 05-20678 · 2005-10-17 · airframe

Airworthiness Directives; MD Helicopters, Inc. Model 369D, 369E, 369F, 369FF, 500N, and 600N Helicopters

What this AD requires

This amendment supersedes an existing airworthiness directive (AD) for the MD Helicopters, Inc. (MDHI) Model 369A, H, HE, HM, HS, D, and E helicopters with a certain part-numbered main rotor blade (blade) and modified with a Helicopter Technology Company, LLC (HTC), Supplemental Type Certificate (STC) No. SR09172RC, SR09074RC, or SR09184RC. That AD currently requires recording on the component history card or equivalent record (record) each torque event (TE) on each blade, inspecting both surfaces of the blade, and replacing any cracked blade with an airworthy blade. Also, that AD establishes life limits for certain part-numbered blades. This amendment revises the model applicability, adds MDHI part-numbered blades, removes any reference to the life limits of the blades, changes the requirements for inspecting the blades, and revises the STC applicability. This amendment also provides that compliance with portions of certain documents constitutes alternative methods of compliance with portions of this AD, contains editorial changes for clarification, and makes some corrections. This amendment is prompted by additional reports of cracked blades and by the comments received in response to AD 2003-24- 01. The actions specified in this AD are intended to detect fatigue cracking of the blade to prevent blade failure and subsequent loss of control of the helicopter.

Which aircraft AD 2005-21-02 applies to

MakesMd Helicopters

Models369D, 369E, 369F, 369FF, 500N, 600N, 369

Part-conditional — 369D21100, 369D21100-516, 369D21100-517, 369D21100-523, 369D21120-501, 369D21120-503, 369D21102, 369D21102-503.

Applies only to helicopters with either an MD Helicopters, Inc. (MDHI) main rotor blade installed, or modified with a Helicopter Technology Company, LLC (HTC) main rotor blade under STC No. SR09172RC (Model 369D), SR09074RC (Model 369E), or SR01050LA (Models 369F, 369FF, 500N, 600N), per the model-specific MDHI/HTC blade part number table in the AD. Certificated in any category.

Whether AD 2005-21-02 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 2005-21-02 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.