Is AD 98-18-13 a recurring Airworthiness Directive?

Yes — AD 98-18-13 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 98-18-13 apply to?

AD 98-18-13 applies to Socata — models TB20, TB21. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-18-13

recurring

Official AD 98-18-13 · FR doc 98-23394 · 1998-09-03 · airframe

Airworthiness Directives; SOCATAGroupe AEROSPATIALE Models TB20 and TB21 Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to certain SOCATA--Groupe AEROSPATIALE (Socata) Models TB20 and TB21 airplanes. This AD requires repetitively inspecting the main landing gear (MLG) attachment bearing (using a dye penetrant method) for cracks, and if cracks are found, replacing the bearing. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for France. The actions specified by this AD are intended to detect and correct cracks in the MLG attachment bearing, which could result in collapse of the main landing gear during taxi and landing operations.

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 98-18-13 applies to

MakesSocata

ModelsTB20, TB21

Serial-conditional — narrows to serials 1–9999.

Whether AD 98-18-13 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 98-18-13 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.