Is AD 2013-05-21 a recurring Airworthiness Directive?

No — AD 2013-05-21 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2013-05-21 apply to?

AD 2013-05-21 applies to Eurocopter — models EC130B4, EC130. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2013-05-21

one-time

Official AD 2013-05-21 · FR doc 2013-06133 · 2013-03-26 · airframe

Airworthiness Directives; Eurocopter France Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for Eurocopter France (Eurocopter) Model EC130 B4 helicopters with a cabin vibration damper installed. This AD requires installing a vibration damper casing assembly on both sides of the helicopter. This AD was prompted by a crack and failure of a cabin vibration damper blade. The actions of this AD are intended to modify the cabin vibration damper assembly to prevent contact with the flight controls in the event of a cabin vibration blade failure, jamming of a flight control, and subsequent loss of control of the helicopter.

Which aircraft AD 2013-05-21 applies to

MakesEurocopter

ModelsEC130B4, EC130

Applies only to helicopters with a cabin vibration damper installed, except those modified in accordance with Modification 073565.

Whether AD 2013-05-21 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 2013-05-21 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.