Is AD 2021-03-04 a recurring Airworthiness Directive?

No — AD 2021-03-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-03-04

Q: Which aircraft does AD 2021-03-04 apply to?

AD 2021-03-04 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 2021-03-04 · FR doc 2021-01848 · 2021-02-22 · 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 requires removing certain Titanium (Ti) bolts from service and prohibits installing these Ti-bolts in a critical area. This AD was prompted by a report of a broken Ti-bolt. The actions of this AD are intended to address an unsafe condition on these products.

Which aircraft AD 2021-03-04 applies to

MakesAirbus Helicopters Deutschland Gmbh

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

Part-conditional — L535M2001203.

Applies to helicopters with a Ti-bolt part number L535M2001203 marked with manufacturer monogram "D" or with an illegible manufacturer monogram installed on the forward tail rotor (T/R) drive shaft. Does not apply to Model EC635 P2+, EC635 P3, EC635 T1, EC635 T2+, or EC635 T3 helicopters because these models are not FAA type-certificated.

Whether AD 2021-03-04 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 2021-03-04 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.