Is AD 2001-07-09 a recurring Airworthiness Directive?

No — AD 2001-07-09 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-07-09 apply to?

AD 2001-07-09 applies to Md Helicopters. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-07-09

one-time

Official AD 2001-07-09 · FR doc 01-8619 · 2001-04-16 · airframe

Airworthiness Directives; MD Helicopters Inc. Model MD-900 Helicopters

What this AD requires

This amendment supersedes an existing emergency airworthiness directive (AD) that applies to MD Helicopters Inc. (MDHI) Model MD-900 helicopters. That emergency AD requires, within 6 hours time-in-service (TIS), or before further flight after January 31, 2000, whichever occurs first, inspecting the main rotor upper hub assembly drive plate attachment flange (flange) and determining the torque of each flange nut (nut). If a crack is found, the hub assembly must be replaced before further flight. The emergency AD also requires, within 25 hours TIS or before further flight after January 31, 2000, whichever occurs first, inspecting the hub assembly and verifying that the torque on the nuts is correct. Replacing a cracked hub assembly with an airworthy hub assembly is required before further flight. This amendment requires the same actions as the existing emergency AD but removes the January compliance dates and corrects errors in the existing emergency AD. This amendment is prompted by the discovery that there are several errors in the emergency AD. The actions specified by this AD are intended to prevent failure of the hub assembly, loss of drive to the main rotor, and subsequent loss of control of the helicopter.

Which aircraft AD 2001-07-09 applies to

MakesMd Helicopters

Part-conditional — 900R2101006-107, 900R2101006-105.

Cross-reference boilerplate only; model list precedes excerpt and was not captured. Requires visual/torque inspection of the main rotor upper hub assembly drive plate attach flange for hub assemblies P/N 900R2101006-107 and 900R2101006-105, per MD Helicopter Inc. Service Bulletin SB900-072, dated December 10, 1999.

Whether AD 2001-07-09 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 2001-07-09 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.