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Airworthiness Directive 2021-15478

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AD 2021-15478 · 2021-07-23 · airframe

Airworthiness Directives; Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited)

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Bell Helicopter Textron Canada Limited (now Bell Textron Canada Limited) Model 206A, 206B, 206L, 206L-1, 206L-3, and 206L-4 helicopters. This AD was prompted by a report that a certain tail rotor disc assembly, sold as an alternate part, does not conform to the approved configuration. This AD requires determining if an affected part is installed (by doing a maintenance records check or inspection), and if an affected part is found, replacement with a non-affected part. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-15478 applies to

MakesBell Textron Canada Limited
Models206A, 206B, 206L, 206L-1, 206L-3, 206L-4, 206
Serial-conditional — narrows to serials 004–660, 672–715, 45004–45153, 46601–46617, 45154–45790, 51001–51612.

Serial number ranges apply per model: 206A S/N 004-660 and 672-715; 206B all S/N (including those converted from 206A); 206L S/N 45004-45153 and 46601-46617; 206L-1 S/N 45154-45790; 206L-3 S/N 51001-51612; 206L-4 all S/N. Type certificate previously held by Bell Helicopter Textron Canada Limited.

Whether AD 2021-15478 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 2021-15478 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.