# Proposed AD 98-CE-73-AD: Pilatus Aircraft Ltd. ModelsPC-12 and PC-12/45 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-06-05
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 30, 1998, 63 FR 71797
- Comments due: February 1, 1999
- Became: [AD 99-06-05](https://openairdocs.org/ad/99-06-05)
- Docket: 98-CE-73-AD
- FR document: 98-34580
- Official PDF: https://openairdocs.org/files/sha256/ca/a9/caa95ddfaa0e2d85f23faf5db89ec8de6ae1ced2deb7330376090feef0bfd7cb (from https://www.govinfo.gov/content/pkg/FR-1998-12-30/pdf/98-34580.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/12/30/98-34580/airworthiness-directives-pilatus-aircraft-ltd-modelspc-12-and-pc-1245-airplanes
- Page: https://openairdocs.org/proposed/98-CE-73-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 removing the ``Alternate Flap System'' from the airplane flight controls and inserting a temporary revision that specifies this change in SECTION 2--LIMITATIONS of the PC-12 Pilot's Operating Handbook. 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 preclude improper use of the ``Alternate Flap System'', which could result in flap asymmetry with consequent reduced or loss of control of the airplane.

## Notices in this docket

- Dec 30, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-34580, comments due Feb 1, 1999 (https://www.federalregister.gov/documents/1998/12/30/98-34580/airworthiness-directives-pilatus-aircraft-ltd-modelspc-12-and-pc-1245-airplanes)

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