Is AD 2017-19-21 a recurring Airworthiness Directive?

No — AD 2017-19-21 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2017-19-21

Q: Which aircraft does AD 2017-19-21 apply to?

Applicability depends on the aircraft's type certificate; check it against the specific tail.

one-time

Official AD 2017-19-21 · FR doc 2017-19939 · 2017-09-25 · airframe

Airworthiness Directives; Airbus Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for Airbus Helicopters Model EC225LP helicopters. This AD requires modifying the emergency lubrication system (EMLUB). This AD was prompted by two incidents of emergency ditching after there was a warning of a loss of oil pressure and a false EMLUB failure. The actions of this AD are intended to address an unsafe condition on these products.

Which aircraft AD 2017-19-21 applies to

Applicability depends on the aircraft’s type certificate — check it against the specific tail.

Whether AD 2017-19-21 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 2017-19-21 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.