# Airworthiness Directives; McDonnell Douglas Model DC-9 Series Airplanes and MD-88 Airplanes
> **Rule** · Final rule; request for comments. · Published 2001-10-11 · Effective 2001-10-26 · 66 FR 51857
## Document
- **Document number:** 01-25394
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Model DC-9 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 51857
- **Publication date:** 2001-10-11
- **Effective date:** 2001-10-26
- **FAA docket:** Docket No. 2001-NM-264-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9 series airplanes and MD-88 airplanes. This action requires an inspection to determine if a certain 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/2001/10/11/01-25394/airworthiness-directives-mcdonnell-douglas-model-dc-9-series-airplanes-and-md-88-airplanes)
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