# Proposed AD 97-NM-139-AD: Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 Series Airplanes, and Model F27 Mark 050 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-14-15
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 20, 1998, 63 FR 13569
- Comments due: April 20, 1998
- Became: [AD 98-14-15](https://openairdocs.org/ad/98-14-15)
- Docket: 97-NM-139-AD
- FR document: 98-7227
- Official PDF: https://openairdocs.org/files/sha256/77/17/77178ea600e777307dd96863ff3785abeb528fbbf7cb977a28aeb19b4ab6d603 (from https://www.govinfo.gov/content/pkg/FR-1998-03-20/pdf/98-7227.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/03/20/98-7227/airworthiness-directives-fokker-model-f27-mark-100-200-300-400-500-600-and-700-series-airplanes-and
- Page: https://openairdocs.org/proposed/97-NM-139-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes, and Model F27 Mark 050 series airplanes. This proposal would require revising the Airplane Flight Manual (AFM) to modify the limitation that prohibits positioning the power levers below the flight idle stop during flight, and to provide a statement of the consequences of positioning the power levers below the flight idle stop during flight. This proposal is prompted by incidents and accidents involving airplanes equipped with turboprop engines in which the ground propeller beta range was used improperly during flight. The actions specified by the proposed AD are intended to prevent loss of airplane controllability caused by the power levers being positioned below the flight idle stop while the airplane is in flight.

## Notices in this docket

- Mar 20, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-7227, comments due Apr 20, 1998 (https://www.federalregister.gov/documents/1998/03/20/98-7227/airworthiness-directives-fokker-model-f27-mark-100-200-300-400-500-600-and-700-series-airplanes-and)

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