# Proposed AD 98-NM-71-AD: McDonnell Douglas Model MD-11 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-24-24
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 3, 1998, 63 FR 46934
- Comments due: October 19, 1998
- Became: [AD 98-24-24](https://openairdocs.org/ad/98-24-24)
- Docket: 98-NM-71-AD
- FR document: 98-23739
- Official PDF: https://openairdocs.org/files/sha256/0e/bf/0ebffff45013da6a73364388d41f26476a75dd76b82f3f74ba16f7151911b005 (from https://www.govinfo.gov/content/pkg/FR-1998-09-03/pdf/98-23739.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/09/03/98-23739/airworthiness-directives-mcdonnell-douglas-model-md-11-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-71-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain MD-11 series airplanes. This proposal would require a one-time visual inspection to detect discrepancies of the seat tracks and adjacent structure underneath lavatories, and repair, if necessary. This proposal also would require installation of a non-metallic barrier on the bottom of each lavatory foot fitting, and replacement of existing seat track fittings with new seat track fittings. This proposal is prompted by reports of galvanic corrosion found on the seat tracks at attachment points under certain lavatories. The actions specified by the proposed AD are intended to prevent corrosion of seat tracks and adjacent structure. Corrosion of the seat tracks and adjacent structure could result in shifting of lavatories, which could lead to injury of passengers and crew, as well as damage to aircraft structure and systems.

## Notices in this docket

- Sep 3, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-23739, comments due Oct 19, 1998 (https://www.federalregister.gov/documents/1998/09/03/98-23739/airworthiness-directives-mcdonnell-douglas-model-md-11-series-airplanes)

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