Is AD 98-9874 a recurring Airworthiness Directive?

Yes — AD 98-9874 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 98-9874 apply to?

AD 98-9874 applies to Twin Commander — models 500, 600, 700. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-9874

recurring

AD 98-9874 · 1998-04-17 · airframe

Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to all Twin Commander Aircraft Corporation (Twin Commander) 500, 600, and 700 series airplanes. This AD requires installing access holes in both wing leading edges and repetitively inspecting the forward attach brackets and straps for cracks. Reports of cracks in the wing to fuselage attachment brackets and straps, wing station (WS) 24, and fuselage frames prompted this action. The actions specified by this AD are intended to detect cracks at the wing to fuselage attach points, which, if not detected and corrected, could cause structural failure and loss of control of the airplane.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 98-9874 applies to

MakesTwin Commander

Models500, 600, 700

applicability derived from the AD summary — confirm the model/serial from the records

Whether AD 98-9874 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 98-9874 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.