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Airworthiness Directive 2021-10-14

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Official AD 2021-10-14 · FR doc 2021-10605 · 2021-05-20 · airframe

Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Deutschland GmbH Model BO-105A, BO-105C, BO- 105S, and BO-105LS A-3 helicopters. This AD was prompted by the FAA's determination that aging of the elastomeric material in a tension torsion strap (TT-strap) could affect the structural characteristics of the TT-strap. This AD requires replacement of certain TT-straps with serviceable parts and implementation of a new storage life limit for TT-straps, as specified in a European Aviation Safety Agency (now European Union Aviation Safety Agency) (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-10-14 applies to

MakesAirbus Helicopters Deutschland Gmbh
ModelsBO-105A, BO-105C, BO-105S, BO-105LS A-3, BO-105

Applies to helicopters equipped with a tension torsion strap (TT-strap) as identified in European Aviation Safety Agency (now European Union Aviation Safety Agency) (EASA) AD 2019-0024, dated February 4, 2019 (EASA AD 2019-0024).

Whether AD 2021-10-14 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 2021-10-14 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.