# Proposed AD 96-NM-178-AD: Jetstream Model ATP Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-16-09
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 4, 1997, 62 FR 16113
- Comments due: May 15, 1997
- Became: [AD 97-16-09](https://openairdocs.org/ad/97-16-09)
- Docket: 96-NM-178-AD
- FR document: 97-8700
- Official PDF: https://openairdocs.org/files/sha256/98/f7/98f77f53e03810b0aecc0f07780ef027bd297517177c5bf39c26e1be6c6dd9b7 (from https://www.govinfo.gov/content/pkg/FR-1997-04-04/pdf/97-8700.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/04/04/97-8700/airworthiness-directives-jetstream-model-atp-airplanes
- Page: https://openairdocs.org/proposed/96-NM-178-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Jetstream Model ATP airplanes. This proposal would require modification of the hydraulic system, and a revision to the Airplane Flight Manual (AFM) to include revised procedures for lowering the landing gear. This proposal is prompted by a report of uncommanded application of the brakes when the direct current (DC) hydraulic pump was selected ON with the main hydraulic system operative; this situation was caused by build-up of back pressure in the brake supply and hydraulic return systems. The actions specified by the proposed AD are intended to prevent uncommanded application of the brakes during landing, as a result of the build-up of back pressure.

## Notices in this docket

- Apr 4, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-8700, comments due May 15, 1997 (https://www.federalregister.gov/documents/1997/04/04/97-8700/airworthiness-directives-jetstream-model-atp-airplanes)

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