# Proposed AD 98-NM-174-AD: British Aerospace Model BAe 146-100A, - 200A, and -300A Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-05-25
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 9, 1999, 64 FR 68956
- Comments due: January 10, 2000
- Became: [AD 2000-05-25](https://openairdocs.org/ad/2000-05-25)
- Docket: 98-NM-174-AD
- FR document: 99-31874
- Official PDF: https://openairdocs.org/files/sha256/91/a7/91a72ac3f40a25880e8fb9d9af49e815721d011da34101362a61d4cfee98066a (from https://www.govinfo.gov/content/pkg/FR-1999-12-09/pdf/99-31874.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/12/09/99-31874/airworthiness-directives-british-aerospace-model-bae-146-100a---200a-and--300a-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-174-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all British Aerospace Model BAe 146-100A, -200A, and -300A series airplanes, that currently requires installation of a placard prescribing special procedures to be followed when operating at certain flight levels with the engine and airframe anti-ice switch ON; modification of the air brake auto-retract function; a revision to the Airplane Flight Manual (AFM) relative to altitude and operating limitations associated with flight in icing conditions above 26,000 feet. That AD was prompted by reports of uncommanded engine thrust reductions (rollback) when operating in certain icing conditions that exist in the vicinity of thunderstorms. This action would add a requirement for the installation/replacement of new placards. This proposal also would provide for an optional terminating modification for the AFM revision and installation/ replacement of placards. The actions specified by the proposed AD are intended to prevent engine power rollback during flight in icing conditions, a condition that could result in insufficient power to sustain flight.

## Notices in this docket

- Dec 9, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-31874, comments due Jan 10, 2000 (https://www.federalregister.gov/documents/1999/12/09/99-31874/airworthiness-directives-british-aerospace-model-bae-146-100a---200a-and--300a-series-airplanes)

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