# Proposed AD 99-NM-290-AD: McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 Series Airplanes; and C-9 (Military) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-26-24
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 6, 2001, 66 FR 30345
- Comments due: July 23, 2001
- Became: [AD 2001-26-24](https://openairdocs.org/ad/2001-26-24)
- Docket: 99-NM-290-AD
- FR document: 01-14144
- Official PDF: https://openairdocs.org/files/sha256/35/5a/355ac3b6fadc351670224b9418a9eff2be8c14269a907a8c54e88891d9b83786 (from https://www.govinfo.gov/content/pkg/FR-2001-06-06/pdf/01-14144.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/06/06/01-14144/airworthiness-directives-mcdonnell-douglas-model-dc-9-10--20--30--40-and--50-series-airplanes-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/750F121134629A0186256A6500539343.0001
- Page: https://openairdocs.org/proposed/99-NM-290-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes; and C-9 (military) airplanes. This proposal would require replacing the transformer ballast assembly in the first officer's console with a new, improved ballast assembly. This action is necessary to prevent overheating of the ballast transformers due to aging fluorescent tubes that cause a higher power demand on the ballast transformers, which could result in smoke in the cockpit. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Jun 6, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-14144, comments due Jul 23, 2001 (https://www.federalregister.gov/documents/2001/06/06/01-14144/airworthiness-directives-mcdonnell-douglas-model-dc-9-10--20--30--40-and--50-series-airplanes-and)

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