# Proposed AD 99-CE-61-AD: Pilatus Aircraft Ltd. Model PC-7 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-01-10
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 28, 1999, 64 FR 52260
- Comments due: October 27, 1999
- Became: [AD 2000-01-10](https://openairdocs.org/ad/2000-01-10)
- Docket: 99-CE-61-AD
- FR document: 99-25222
- Official PDF: https://openairdocs.org/files/sha256/c2/9e/c29e3254c2082ff222400a6fae15a421ace2c2df2e26cfb146389dbd5152d23b (from https://www.govinfo.gov/content/pkg/FR-1999-09-28/pdf/99-25222.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/09/28/99-25222/airworthiness-directives-pilatus-aircraft-ltd-model-pc-7-airplanes
- Page: https://openairdocs.org/proposed/99-CE-61-AD

## Summary

This document proposes to supersede Airworthiness Directive (AD) 98-08-07, which currently requires replacing the rudder and elevator pivot arms with parts of improved design on certain Pilatus Aircraft Ltd. (Pilatus) Model PC-7 airplanes. The proposed AD would require replacing the rudder and elevator pivot arms with parts that have been improved since issuance of AD 98-08-07. 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 failure of the elevator and rudder caused by fatigue cracking of the pivot arms, which could result in reduced airplane controllability and possible loss of control of the airplane.

## Notices in this docket

- Sep 28, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-25222, comments due Oct 27, 1999 (https://www.federalregister.gov/documents/1999/09/28/99-25222/airworthiness-directives-pilatus-aircraft-ltd-model-pc-7-airplanes)

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