Is AD 2021-16-12 a recurring Airworthiness Directive?

No — AD 2021-16-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-16-12 apply to?

AD 2021-16-12 applies to Bell Textron Canada Limited — models 505. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-16-12

one-time

Official AD 2021-16-12 · FR doc 2021-19251 · 2021-09-08 · airframe

Airworthiness Directives; Bell Textron Canada Limited Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited Model 505 helicopters. This AD was prompted by three occurrences of metallic debris in the engine oil lubrication system causing the 12 volts direct current (VDC) reference voltage to be shorted to ground and loss of important flight information to the pilot. This AD requires replacing a certain part- numbered relay panel assembly. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-16-12 applies to

MakesBell Textron Canada Limited

Models505

Serial-conditional — narrows to serials 65011–65023, 65025–65028, 65030–65032, 65034–65034, 65036–65036.

Part-conditional — SLS-075-002-107.

Applies only to the specified serial-numbered helicopters with relay panel assembly, part number SLS-075-002-107, installed.

Whether AD 2021-16-12 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 2021-16-12 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.