Is AD 98-21992 a recurring Airworthiness Directive?

No — AD 98-21992 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-21992 apply to?

AD 98-21992 applies to British Aerospace (Jetstream) — models 4100. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-21992

one-time

AD 98-21992 · 1998-08-19 · airframe

Airworthiness Directives; British Aerospace (Jetstream) Model 4100 Series Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain British Aerospace (Jetstream) Model 4100 series airplanes, that requires an eddy current conductivity test to measure the conductivity of the upper splice plate of the wing, and follow-on actions, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to correct corrosion of the upper splice plate of the wing, which could result in reduced structural integrity of the airplane.

Which aircraft AD 98-21992 applies to

MakesBritish Aerospace (Jetstream)

Models4100

certain

Whether AD 98-21992 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 98-21992 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.