# Proposed AD 98-NM-267-AD: McDonnell Douglas Model DC-9-81, -82, - 83, and -87 Series Airplanes (MD-81, -82, -83, and -87), and Model MD- 88 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-21-06
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 21, 1999, 64 FR 39097
- Comments due: September 7, 1999
- Became: [AD 99-21-06](https://openairdocs.org/ad/99-21-06)
- Docket: 98-NM-267-AD
- FR document: 99-18626
- Official PDF: https://openairdocs.org/files/sha256/41/ea/41ea6bf8f0062fdd81eb99ec00bf585602a811703777da540a7fcf3e00787fec (from https://www.govinfo.gov/content/pkg/FR-1999-07-21/pdf/99-18626.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/07/21/99-18626/airworthiness-directives-mcdonnell-douglas-model-dc-9-81--82---83-and--87-series-airplanes-md-81--82
- Page: https://openairdocs.org/proposed/98-NM-267-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all McDonnell Douglas Model DC-9-81, -82, -83, and -87 series airplanes (MD-81, -82, -83, and -87), and Model MD-88 airplanes, that currently requires visual or eddy current inspections to detect cracks of the actuator cylinder support brackets of the slat drive mechanism assembly, and replacement of any cracked brackets. This action would continue to require repetitive eddy current inspections, would add an inspection requirement, and would expand the area of inspection. This action also would provide terminating action for the repetitive inspections. This proposal is prompted by reports indicating that additional cracking was found outside the original inspection area. The actions specified by the proposed AD are intended to prevent inadvertent slat retraction in flight.

## Notices in this docket

- Jul 21, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-18626, comments due Sep 7, 1999 (https://www.federalregister.gov/documents/1999/07/21/99-18626/airworthiness-directives-mcdonnell-douglas-model-dc-9-81--82---83-and--87-series-airplanes-md-81--82)

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