Is AD 98-08-26 a recurring Airworthiness Directive?

No — AD 98-08-26 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-08-26 apply to?

AD 98-08-26 applies to Pilatus Aircraft Ltd.. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-08-26

one-time

Official AD 98-08-26 · FR doc 98-10176 · 1998-04-20 · 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 installing aluminum bonding bushings over certain screws in certain fuel tank underwing access panels. Several reports from the field revealing fuel tank access panels insufficiently electrically bonded to the airframe prompted this action. The actions specified by this AD are intended to prevent electrical arcing in the fuel tanks and detonation of the fuel-air mixture, which can be created by poor electrical bonding of fuel tank underwing access panels, and could result in a fire on the airplane.

Which aircraft AD 98-08-26 applies to

MakesPilatus Aircraft Ltd.

Specific model not stated in provided applicability text. Within next 100 hours TIS after effective date, install aluminum bonding bushings onto screws for certain fuel tank underwing access panels, per Parts A and B of the Accomplishment Instructions in Pilatus SB No. 57-001 (Feb 28, 1997). Prevents electrical arcing in fuel tanks from poor electrical bonding of access panels, which could cause a fire.

Whether AD 98-08-26 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 98-08-26 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.