Is AD 98-21-36 a recurring Airworthiness Directive?

No — AD 98-21-36 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-21-36 apply to?

AD 98-21-36 applies to Robinson Helicopter Company — models R44. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-21-36

one-time

Official AD 98-21-36 · FR doc 98-27760 · 1998-10-19 · airframe

Airworthiness Directives; Robinson Helicopter Company Model R44 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to Robinson Helicopter Company (Robinson) Model R44 helicopters, that requires removing and replacing the cyclic control pilot's grip assembly (grip assembly) with an airworthy grip assembly. This amendment is prompted by a report of a crack in the welded corner of a grip assembly. The actions specified by this AD are intended to prevent use of a grip assembly that may crack, resulting in failure of the grip assembly and subsequent loss of control of the helicopter.

Which aircraft AD 98-21-36 applies to

MakesRobinson Helicopter Company

ModelsR44

Whether AD 98-21-36 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 98-21-36 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.