# Airworthiness Directives; McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 Series Airplanes; and C-9 Airplanes
> **Rule** · Final rule. · Published 2002-01-04 · Effective 2002-02-08 · 67 FR 497
## Document
- **Document number:** 02-5
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 67 FR 497
- **Publication date:** 2002-01-04
- **Effective date:** 2002-02-08
- **FAA docket:** Docket No. 99-NM-290-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes; and C-9 airplanes that requires replacing the transformer ballast assembly in the pilot's console with a new, improved ballast assembly. The actions specified by this AD are intended 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2002/01/04/02-5/airworthiness-directives-mcdonnell-douglas-model-dc-9-10--20--30--40-and--50-series-airplanes-and)
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