Is AD 98-05-01 a recurring Airworthiness Directive?

No — AD 98-05-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-05-01 apply to?

AD 98-05-01 applies to Eurocopter — models SA366. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-05-01

one-time

Official AD 98-05-01 · FR doc 98-4979 · 1998-02-27 · airframe

Airworthiness Directives; Eurocopter France Model SA-366G1 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to Eurocopter France Model SA-366G1 helicopters, with certain main rotor head frequency adapters (frequency adapters) installed. This proposal requires inspecting the frequency adapter to determine if a certain frequency adapter is installed, and if so, removing and discarding the frequency adapter and replacing it with an airworthy frequency adapter before further flight. This amendment is prompted by a report of disbonding of the metal center section of a frequency adapter from the elastomer, caused by a lack of adherence during the production process. The actions specified by this AD are intended to prevent vibrations caused by disbonding of the center section of a frequency adapter from the elastomer, that could result in loss of control of the helicopter.

Which aircraft AD 98-05-01 applies to

MakesEurocopter

ModelsSA366

Serial-conditional — narrows to serials ?–8188, ?–3122.

Part-conditional — 704A33-640-031, 365A31-1858-01, 704A33-640-046, 365A31-1858-02.

Applies when main rotor head frequency adapter P/N 704A33-640-031 (delivered in pairs as P/N 365A31-1858-01), manufactured before April 1, 1991 with S/N equal to or less than 8188, or P/N 704A33-640-046 (pairs P/N 365A31-1858-02), manufactured before April 1, 1991 with S/N equal to or less than 3122, is installed. Requires replacement with an airworthy frequency adapter per Eurocopter SA-366 SB 01.23 dated May 9, 1996, within 100 hours TIS or 6 months, whichever first.

Whether AD 98-05-01 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 98-05-01 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.