Is AD 2013-21578 a recurring Airworthiness Directive?

No — AD 2013-21578 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2013-21578 apply to?

AD 2013-21578 applies to Bell — models 206A, 206B, 206L, 206. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2013-21578

one-time

AD 2013-21578 · 2013-09-06 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada Inc. Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Bell Helicopter Textron Canada Inc. (BHT) Model 206A, 206B, and 206L helicopters. This AD requires replacing certain part-numbered engine auto-relight kit control boxes. This AD was prompted by a design review that revealed the control box chipset did not meet the required temperature range requirements, which could cause the control box to malfunction, disabling the engine auto-relight system. The actions of this AD are intended to prevent a disabled auto-relight system, failure of the engine to relight after a flame-out, increased pilot workload during a power loss emergency, and subsequent loss of control of the helicopter.

Which aircraft AD 2013-21578 applies to

MakesBell

Models206A, 206B, 206L, 206

Serial-conditional — narrows to serials 45001–45153, 46601–46617.

Part-conditional — 206-375-017-101, 206-375-017-103.

206A/206B: all S/N except S/Ns 1, 2, and 3, with engine auto-relight kit control box assembly P/N 206-375-017-101 installed. 206L: S/N 45001-45153 and 46601-46617 with control box assembly P/N 206-375-017-103 installed.

Whether AD 2013-21578 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 2013-21578 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.