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Airworthiness Directive 99-06-17

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Official AD 99-06-17 · FR doc 99-6715 · 1999-03-23 · 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 a support bracket and a cut-out relay for the second generator control unit. This AD also requires making all the wiring additions and adjustments necessary for the above-referenced installations. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified in this AD are intended to prevent damage to electrical components because incorrectly connected cables or broken or damaged wires cause excessive voltages to the second generator, which could result in loss of electrical power during any phase of flight.

Which aircraft AD 99-06-17 applies to

MakesPilatus

Boilerplate applicability only; the specific model/serial-number list precedes this excerpt and is not included. Requires installing a support bracket and cut-out relay for the second generator control unit and associated wiring per Modification Kit No. 500.50.12.171 / Pilatus Service Bulletin No. 24-009 (September 23, 1998), to prevent damage to electrical components from incorrectly connected cables or damaged wires causing loss of electrical power.

Whether AD 99-06-17 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 99-06-17 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.