Is AD 98-04-16 a recurring Airworthiness Directive?

No — AD 98-04-16 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-04-16 apply to?

AD 98-04-16 applies to Pilatus. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-04-16

one-time

Official AD 98-04-16 · FR doc 98-3637 · 1998-02-17 · airframe

Airworthiness Directives; Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC- 12/45 airplanes. This AD requires inspecting the aileron tie-rod jam nuts for looseness, tightening any loose jam nuts, and installing a locking sleeve on both ends of the aileron tie-rod in the chain-drive of the aileron system. The AD results from an incident where the aileron tie-rod jam nuts on the chain-drive of the aileron system became loose. This caused a differential of aileron control between the pilot's control wheel and the co-pilot's control wheel. The actions specified by this AD are intended to prevent such aileron control differential caused by the aileron tie-rod jam nuts becoming loose, which could result in loss of aileron control and consequent loss of control of the airplane.

Which aircraft AD 98-04-16 applies to

MakesPilatus

Aileron tie-rod jam nut inspection/tightening and locking-sleeve installation per Pilatus Service Bulletin No. 27-001, dated March 25, 1997 (also addressed in Swiss AD HB 97-174). Text does not specify which Pilatus model this applies to.

Whether AD 98-04-16 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 98-04-16 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.