Is AD 2017-04-51 a recurring Airworthiness Directive?

No — AD 2017-04-51 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2017-04-51

Q: Which aircraft does AD 2017-04-51 apply to?

AD 2017-04-51 applies to Safran Helicopter Engines — models Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2017-04-51 · FR doc 2017-05236 · 2017-03-15 · turboshaft engine

Airworthiness Directives; Safran Helicopter Engines, S.A., Turboshaft Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for all Safran Helicopter Engines, S.A., Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. Emergency AD 2017-04-51 was sent previously to all known U.S. owners and operators of these engines. This AD requires inspecting, wrapping, and replacing the affected drain valve assembly (DV) installed on these Arriel 1 engines. This AD was prompted by reports of fuel leaks originating from the DV on certain Arriel engines. We are issuing this AD to correct the unsafe condition on these products.

Which aircraft AD 2017-04-51 applies to

MakesSafran Helicopter Engines

ModelsArriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1, Arriel

Applies only to engines equipped with a drain valve assembly (DV) having a part number and serial number listed in Appendix 5.1 of Safran Helicopter Engines Alert Mandatory Service Bulletin (MSB) A292 73 0851, Version A, dated January 31, 2017.

Whether AD 2017-04-51 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 2017-04-51 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.