# Airworthiness Directives; McDonnell Douglas Model DC-9-31 and DC-9-32 Airplanes
> **Rule** · Final rule. · Published 2004-03-03 · Effective 2004-04-07 · 69 FR 9932
## Document
- **Document number:** 04-4561
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Model DC-9-31 and DC-9-32
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 9932
- **Publication date:** 2004-03-03
- **Effective date:** 2004-04-07
- **FAA docket:** Docket No. 2003-NM-32-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-31 and DC-9-32 airplanes, that requires replacement of certain power relays, and subsequent repetitive cleaning, inspecting, repairing, and testing of certain replaced power relays. This action is necessary to prevent internal arcing of the left and right generator power relays, auxiliary power relays, and external power relays, and consequent smoke and/or fire in the cockpit and cabin. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/03/03/04-4561/airworthiness-directives-mcdonnell-douglas-model-dc-9-31-and-dc-9-32-airplanes)
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