# Proposed AD 98-NM-323-AD: Boeing Model 757-200, -200PF, and - 200CB Series Airplanes Powered by Rolls-Royce RB211-535C/E4/E4B Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-27-06
- Action: Supplemental notice of proposed rulemaking; reopening of comment period.
- Published: September 10, 1999, 64 FR 49105
- Comments due: October 5, 1999
- Became: [AD 99-27-06](https://openairdocs.org/ad/99-27-06)
- Docket: 98-NM-323-AD
- FR document: 99-23478
- Official PDF: https://openairdocs.org/files/sha256/99/d5/99d501f9671267476b14c8706fa33c878a8dc7229eff87e704e12e41e5931eee (from https://www.govinfo.gov/content/pkg/FR-1999-09-10/pdf/99-23478.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/09/10/99-23478/airworthiness-directives-boeing-model-757-200--200pf-and---200cb-series-airplanes-powered-by
- Page: https://openairdocs.org/proposed/98-NM-323-AD

## Summary

This document revises an earlier proposed airworthiness directive (AD), applicable to certain Boeing Model 757-200, -200PF, and -200CB series airplanes, that would have required modification of the engine thrust control cable installation, and repetitive inspections to detect certain discrepancies of the cables, pulleys, pulley brackets, and cable travel; and repair, if necessary. That proposal was prompted by reports of failure of certain engine thrust control cables. This new action would revise the proposed rule by extending the compliance time for certain actions, revising certain inspection procedures, and adding a requirement for a one-time inspection to determine the part number of thrust control cable pulleys and replacement of existing pulleys with new pulleys, if necessary. The actions specified by this new proposed AD are intended to prevent failure of certain engine thrust control cables, which could result in a severe asymmetric thrust condition during landing, and consequent reduced controllability of the airplane.

## Notices in this docket

- Feb 17, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-3736, comments due Apr 5, 1999 (https://www.federalregister.gov/documents/1999/02/17/99-3736/airworthiness-directives-boeing-model-757-200--200pf-and---200cb-series-airplanes-powered-by)
- Sep 10, 1999: Supplemental notice of proposed rulemaking; reopening of comment period., FR document 99-23478, comments due Oct 5, 1999 (https://www.federalregister.gov/documents/1999/09/10/99-23478/airworthiness-directives-boeing-model-757-200--200pf-and---200cb-series-airplanes-powered-by)

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