Is AD 2021-20408 a recurring Airworthiness Directive?

No — AD 2021-20408 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-20408 apply to?

AD 2021-20408 applies to Bell Textron Inc. — models 205B, 205. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-20408

one-time

AD 2021-20408 · 2021-09-23 · airframe

Airworthiness Directives; Bell Textron Inc. (Type Certificate Previously Held by Bell Helicopter Textron Inc.) Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Inc. (type certificate previously held by Bell Helicopter Textron Inc.) Model 205B helicopters. This AD was prompted by a notification of certain parts needing a life limit. This AD requires determining the total hours time-in-service (TIS) of certain part-numbered main rotor grip assemblies (grip assemblies), establishing a life limit for certain part-numbered grip assemblies, removing from service any grip assembly that has reached or exceeded its retirement life, creating a component history card, and removing any grip assembly from service before reaching its retirement life. This AD also prohibits installing certain grip assemblies unless the life limit was established in accordance with this AD. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-20408 applies to

MakesBell Textron Inc.

Models205B, 205

Part-conditional — 204-011-121-005, 204-011-121-113, 204-011-121-117.

Applies only to helicopters with main rotor grip assembly, part number 204-011-121-005, 204-011-121-113, or 204-011-121-117, installed.

Whether AD 2021-20408 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 2021-20408 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.