# Proposed AD 96-NM-12-AD: Boeing Model 757 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-05-10
- Action: Supplemental notice of proposed rulemaking; reopening of comment period.
- Published: October 27, 1997, 62 FR 55540
- Comments due: November 26, 1997
- Became: [AD 99-05-10](https://openairdocs.org/ad/99-05-10)
- Docket: 96-NM-12-AD
- FR document: 97-28318
- Official PDF: https://openairdocs.org/files/sha256/d6/2b/d62ba2421ea48016b896d155c3daccd4b86b96f949326248dd6f70aa7f7dbf1d (from https://www.govinfo.gov/content/pkg/FR-1997-10-27/pdf/97-28318.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/10/27/97-28318/airworthiness-directives-boeing-model-757-series-airplanes
- Page: https://openairdocs.org/proposed/96-NM-12-AD

## Summary

This document revises an earlier proposed airworthiness directive (AD), applicable to all Boeing Model 757 series airplanes, that would have required the replacement of certain discrepant ram air turbine (RAT) deployment actuator assemblies that were shipped improperly. That proposal was prompted by reports of certain RAT actuators that failed to deploy upon command due to interference in the actuator locking mechanism caused by damage incurred during shipping of the actuators. This new action revises the proposed rule to require the use of an FAA-approved maintenance program in lieu of the use of shipping procedures prescribed in that proposal. Failure of the RAT to deploy, specifically during a dual engine failure, would result in loss of hydraulic power and would adversely affect the continued safe flight and landing of the airplane.

## Notices in this docket

- Aug 6, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-19893, comments due Sep 16, 1996 (https://www.federalregister.gov/documents/1996/08/06/96-19893/airworthiness-directives-boeing-model-757-series-airplanes)
- Oct 27, 1997: Supplemental notice of proposed rulemaking; reopening of comment period., FR document 97-28318, comments due Nov 26, 1997 (https://www.federalregister.gov/documents/1997/10/27/97-28318/airworthiness-directives-boeing-model-757-series-airplanes)

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