Is AD 2001-13-51 a recurring Airworthiness Directive?

No — AD 2001-13-51 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-13-51 apply to?

AD 2001-13-51 applies to Bell — models 206L-4, 206L, 407, 427. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-13-51

one-time

Official AD 2001-13-51 · FR doc 01-23416 · 2001-09-21 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada Model 206L-4, 407, and 427 Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2001-13-51, which was sent previously to all known U.S. owners and operators of Bell Helicopter Textron Canada (BHTC) Model 206L-4, 407, and 427 helicopters by individual letters. This AD requires visually inspecting certain driveshafts for a crack, a loose bolt or nut, or red powder residue. If a crack, a loose bolt or nut, or red powder residue is found, replacing the driveshaft before further flight and notifying the FAA within 10 days is also required. This amendment is prompted by a driveshaft failure on a BHTC Model 407 helicopter that resulted in an engine shutdown and an emergency landing. Failure of the driveshaft was due to cracking of the flexframe on the forward end of the driveshaft. In addition, three other incidents of a cracked flexframe on the forward end of the driveshaft on other Model 407 helicopters have been reported. The actions specified by this AD are intended to prevent failure of a driveshaft, loss of drive to the main rotor system, and a subsequent emergency forced landing.

Which aircraft AD 2001-13-51 applies to

MakesBell

Models206L-4, 206L, 407, 427

Part-conditional — 206-340-300-105.

Applies only when engine-to-transmission driveshaft assembly P/N 206-340-300-105 has ever been installed on the helicopter.

Whether AD 2001-13-51 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 2001-13-51 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.