# Proposed AD 99-CE-10-AD: Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-17-08
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 14, 1999, 64 FR 31758
- Comments due: July 14, 1999
- Became: [AD 99-17-08](https://openairdocs.org/ad/99-17-08)
- Docket: 99-CE-10-AD
- FR document: 99-14936
- Official PDF: https://openairdocs.org/files/sha256/04/ce/04cefc79687ed06f85a69d3c600cab39ed525cb2c5ccf406ed4ccd24a0dfed74 (from https://www.govinfo.gov/content/pkg/FR-1999-06-14/pdf/99-14936.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/06/14/99-14936/airworthiness-directives-pilatus-aircraft-ltd-models-pc-12-and-pc-1245-airplanes
- Page: https://openairdocs.org/proposed/99-CE-10-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes. The proposed AD would require modifying the generator 2 excitation by removing certain diodes and installing a new 5-amp circuit breaker and suppression filter. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by the proposed AD are intended to prevent damage to electrical components if the generator 2 is not switched off prior to engine shutdown and it overheats, which could result in loss of electrical power to certain critical airplane components.

## Notices in this docket

- Jun 14, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-14936, comments due Jul 14, 1999 (https://www.federalregister.gov/documents/1999/06/14/99-14936/airworthiness-directives-pilatus-aircraft-ltd-models-pc-12-and-pc-1245-airplanes)

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