Is AD 2021-24-17 a recurring Airworthiness Directive?

No — AD 2021-24-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-24-17

Q: Which aircraft does AD 2021-24-17 apply to?

AD 2021-24-17 applies to Airbus Helicopters Deutschland Gmbh — models EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2021-24-17 · FR doc 2021-26975 · 2021-12-14 · 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 EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, and EC135T3 helicopters. This AD was prompted by reduced life limits being established for certain part-numbered tail rotor (TR) blades. This AD requires determining the total hours time-in-service (TIS) of certain part- numbered TR blades, establishing a life limit for certain part-numbered TR blades, removing from service any TR blade that has reached or exceeded its life limit, creating a component history card, re- identifying certain part-numbered TR blades, and removing any TR blade from service before reaching its retirement life. This AD also prohibits installing certain TR blades on certain model helicopters. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-24-17 applies to

MakesAirbus Helicopters Deutschland Gmbh

ModelsEC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3, EC135

Part-conditional — L642A2002101, L642A2002103, L642A2002104, L642A2002111, L642A2002112.

Applies only to helicopters with tail rotor (TR) blade part number L642A2002101, L642A2002103, L642A2002104, L642A2002111, or L642A2002112 installed.

Whether AD 2021-24-17 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 2021-24-17 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.