Is AD 98-05-17 a recurring Airworthiness Directive?

No — AD 98-05-17 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-05-17 apply to?

AD 98-05-17 applies to Eurocopter — models SA-365N, SA-365N1, AS-365N2, SA-366G1, SA365, AS365, SA366. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-05-17

one-time

Official AD 98-05-17 · FR doc 98-5733 · 1998-03-06 · airframe

Airworthiness Directives; Eurocopter France Model SA-365N, SA- 365N1, AS-365N2, and SA-366G1 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to Eurocopter France Model SA-365N, SA-365N1, AS-365N2, and SA-366G1 helicopters. This action requires inspecting for rotational play or looseness of the outboard fin attachment studs (studs) and washers (if washers are present); inspecting each stud for incremental rotational movement or pure rotation; and if there is rotational play or looseness of any individual stud, performing a dye- penetrant inspection for cracks on each stud utilized in the installation. This amendment is prompted by a report of an outboard fin separating from the helicopter during flight, and several reports of loose outboard fins in service. This condition, if not corrected, could result in an outboard fin separating and contacting the rotor blades during flight, and subsequent loss of control of the helicopter.

Which aircraft AD 98-05-17 applies to

MakesEurocopter

ModelsSA-365N, SA-365N1, AS-365N2, SA-366G1, SA365, AS365, SA366

Part-conditional — 365A13-3017-24.

Requires inspecting outboard fin attachment studs P/N 365A13-3017-24 (not modified per MOD 0755B08) for looseness/rotation and dye-penetrant cracks, within 50 hours TIS, per Eurocopter AS365 SB 01.00.40 Rev 1 (SA-365N, SA-365N1, AS-365N2) or AS366 SB 01.20 Rev 1 (SA-366G1), both dated Oct 24, 1996; cracked studs replaced with an airworthy stud.

Whether AD 98-05-17 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 98-05-17 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.