# Proposed AD 98-NM-381-AD: McDonnell Douglas Model DC-9, DC-9-80, and C-9 (Military) Series Airplanes, and Model MD-88 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-02-23
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 14, 1999, 64 FR 37911
- Comments due: August 30, 1999
- Became: [AD 2000-02-23](https://openairdocs.org/ad/2000-02-23)
- Docket: 98-NM-381-AD
- FR document: 99-17863
- Official PDF: https://openairdocs.org/files/sha256/a1/f0/a1f00aeacb6bfc67fe951fffaeb227abde5d71b6f2873ff622d13bd425f34198 (from https://www.govinfo.gov/content/pkg/FR-1999-07-14/pdf/99-17863.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/07/14/99-17863/airworthiness-directives-mcdonnell-douglas-model-dc-9-dc-9-80-and-c-9-military-series-airplanes-and
- Page: https://openairdocs.org/proposed/98-NM-381-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9, DC-9-80, and C-9 (military) series airplanes, and Model MD-88 airplanes. This proposal would require a one-time inspection to determine the type of engine ignition switch installed in the hinged forward overhead switch panel, and replacement of certain rotary ignition switches with new design rotary ignition switches. This proposal is prompted by reports of smoke in the flight compartment during engine ignition selection. The actions specified by the proposed AD are intended to prevent an internal electrical short in the engine ignition switch, which could result in smoke in the flight compartment.

## Notices in this docket

- Jul 14, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-17863, comments due Aug 30, 1999 (https://www.federalregister.gov/documents/1999/07/14/99-17863/airworthiness-directives-mcdonnell-douglas-model-dc-9-dc-9-80-and-c-9-military-series-airplanes-and)

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