Is AD 2013-05-17 a recurring Airworthiness Directive?

No — AD 2013-05-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2013-05-17 apply to?

AD 2013-05-17 applies to Sikorsky Aircraft Corporation — models S-61A, S-61D, S-61E, S-61L, S-61N, S-61NM, S-61R, S-61V. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2013-05-17

one-time

Official AD 2013-05-17 · FR doc 2013-05874 · 2013-03-22 · airframe

Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-61A, D, E, L, N, NM, R, and V helicopters to require replacing each forward and aft fuel system 40 micron fuel filter element with a 10 micron nominal (40 micron absolute) fuel filter element. This AD was prompted by a National Transportation Safety Board (NTSB) review of in-service events where engine performance degradation occurred, and the review determined that some of these events were caused by contaminants larger than 10 microns present in the engine fuel control units (FCUs). The actions are intended to prevent particulate contamination in the FCU, which could lead to malfunction of an internal valve, power loss at a critical phase of flight, and loss of control of the helicopter.

Which aircraft AD 2013-05-17 applies to

MakesSikorsky Aircraft Corporation

ModelsS-61A, S-61D, S-61E, S-61L, S-61N, S-61NM, S-61R, S-61V, S-61

Part-conditional — 52-0505-2, 52-01064-1.

Applies only to helicopters with a fuel system 40 micron fuel filter element, P/N 52-0505-2 or 52-01064-1, installed.

Whether AD 2013-05-17 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 2013-05-17 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.