Is AD 2001-01-51 a recurring Airworthiness Directive?

No — AD 2001-01-51 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-01-51 apply to?

AD 2001-01-51 applies to Bell. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-01-51

one-time

Official AD 2001-01-51 · FR doc 01-3561 · 2001-02-15 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada Model 222, 222B, 222U, 230, and 430 Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2001-01-51, which was sent previously to all known U.S. owners and operators of Bell Helicopter Textron Canada (BHTC) Model 222, 222B, 222U, 230, and 430 helicopters by individual letters. This AD requires visually inspecting the main rotor hydraulic actuator support (support) to verify the presence of all dowel pins and sealant between the support and transmission and verifying the proper torque of each attaching nut (nut). This amendment is prompted by the failure of a support resulting in an accident of a BHTC Model 222U helicopter. All retaining studs and shear pins were found sheared or pulled out at the junction between the support and the transmission case. The actions specified by this AD are intended to prevent failure of the support and subsequent loss of control of the helicopter.

Which aircraft AD 2001-01-51 applies to

MakesBell

Cross-reference boilerplate only; model list precedes excerpt and was not captured. Requires, within 25 hours TIS and thereafter every 600 hours TIS, inspecting the main rotor mast support for dowel pins/sealant and verifying attaching-nut torque, with further inspection/repair/replacement of the support, transmission case, studs, or dowel pins if deficiencies found; per Bell Helicopter Textron Alert Service Bulletin Nos. 222-00-86, 222U-00-57, 230-00-18, or 430-00-17, all dated May 19, 2000.

Whether AD 2001-01-51 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 2001-01-51 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.