# Airworthiness Directives; Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes
> **Rule** · Direct final rule; confirmation of effective date. · Published 1999-05-11 · Effective 1999-06-16 · 64 FR 25200
## Document
- **Document number:** 99-11780
- **Category:** airworthiness
- **Manufacturer:** Pilatus
- **Type:** Rule
- **Action:** Direct final rule; confirmation of effective date.
- **Citation:** 64 FR 25200
- **Publication date:** 1999-05-11
- **Effective date:** 1999-06-16
- **FAA docket:** Docket No. 99-CE-03-AD
## Abstract

This action confirms the effective date of Airworthiness Directive (AD) 99-06-17, which applies to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes. AD 99-06-17 requires installing a support bracket and a cut-out relay for the second generator control unit. AD 99-06-17 also requires making all the wiring additions and adjustments necessary for the above-referenced installations. This AD was 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/05/11/99-11780/airworthiness-directives-pilatus-aircraft-ltd-models-pc-12-and-pc-1245-airplanes)
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