# Airworthiness Directives; McDonnell Douglas Model MD-90-30 Airplanes
> **Rule** · Final rule. · Published 2003-05-29 · Effective 2003-07-03 · 68 FR 31968
## Document
- **Document number:** 03-13116
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Model MD-90-30
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 68 FR 31968
- **Publication date:** 2003-05-29
- **Effective date:** 2003-07-03
- **FAA docket:** Docket No. 2001-NM-196-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all McDonnell Douglas Model MD-90-30 airplanes, that requires replacement of the starter relay of the auxiliary power unit (APU) with a new, improved relay. The actions specified by this AD are intended to prevent failure of the APU starter relay, which could result in depleted main airplane batteries, overheated APU starters, and damage to the wiring adjacent to the APU starter. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/05/29/03-13116/airworthiness-directives-mcdonnell-douglas-model-md-90-30-airplanes)
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