Is AD 2001-13-01 a recurring Airworthiness Directive?

No — AD 2001-13-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-13-01 apply to?

AD 2001-13-01 applies to Bell — models 205A-1, 205B, 205, 212. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-13-01

one-time

Official AD 2001-13-01 · FR doc 01-15794 · 2001-06-27 · airframe

Airworthiness Directives; Bell Helicopter Textron, Inc. Model 205A-1, 205B, 212, 412, 412EP, and 412CF Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD), for Bell Helicopter Textron, Inc. (BHTI) Model 205A-1, 205B, 212, 412, 412EP, and 412CF helicopters. This AD requires removing each existing tail rotor counterweight bellcrank (bellcrank) retention nut (retention nut), replacing each retention nut with a zero hours time-in-service (TIS) retention nut; and follow-up inspections of installed retention nuts. This AD is prompted by an in-flight loss of a bellcrank due to failure of the retention nut. The actions specified by this AD are intended to prevent failure of the retention nut, which could result in the bellcrank migrating off the crosshead spindle, loss of tail rotor control, and subsequent loss of control of the helicopter.

Which aircraft AD 2001-13-01 applies to

MakesBell

Models205A-1, 205B, 205, 212

Part-conditional — 212-010-709-001, 212-011-705-001, MS14145L6, MS17826-6.

Text explicitly separates requirements 'For Model 205A-1 helicopters', 'For Model 205B helicopters', and 'For Model 212 helicopters'. Requires replacing tail rotor counterweight bellcrank retention nuts (old P/N 212-010-709-001 or 212-011-705-001, new P/N MS14145L6 or MS17826-6) and repetitive inspection, per Bell ASB 205-00-77 Rev A, ASB 205B-00-31 Rev A, and the corresponding Model 212 bulletin.

Whether AD 2001-13-01 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 2001-13-01 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.