# Airworthiness Directives; McDonnell Douglas Model DC-9-31 Airplane
> **Rule** · Final rule; request for comments. · Published 2002-04-23 · Effective 2002-05-08 · 67 FR 19637
## Document
- **Document number:** 02-9571
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 67 FR 19637
- **Publication date:** 2002-04-23
- **Effective date:** 2002-05-08
- **FAA docket:** Docket No. 2002-NM-37-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to one McDonnell Douglas Model DC-9-31 airplane. This action requires an inspection to determine if a certain alternating current (AC) cross-tie relay is installed; replacement of a certain AC cross-tie relay with a new AC cross-tie relay; and repetitive cleaning, inspection, repair, and testing of a certain AC cross-tie relay. This action is necessary to prevent AC cross-tie relay failures, which could result in internal arcing of the relay and 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/2002/04/23/02-9571/airworthiness-directives-mcdonnell-douglas-model-dc-9-31-airplane)
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