# Airworthiness Directives; McDonnell Douglas Model DC-9-10, -20, -30, and -40 Series Airplanes and C-9 Airplanes
> **Rule** · Final rule. · Published 2001-12-12 · Effective 2002-01-16 · 66 FR 64114
## Document
- **Document number:** 01-30201
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 64114
- **Publication date:** 2001-12-12
- **Effective date:** 2002-01-16
- **FAA docket:** Docket No. 2001-NM-104-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, and - 40 series airplanes and C-9 airplanes. This amendment requires modification of the spoiler control system, and installation of protective interlock box assemblies in the spoiler circuit. This amendment is necessary to prevent smoke/fire in the flight compartment in the event that the automatic spoiler actuator overheats, and/or loss of the spoiler control system, which could significantly reduce the braking effectiveness of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/12/12/01-30201/airworthiness-directives-mcdonnell-douglas-model-dc-9-10--20--30-and--40-series-airplanes-and-c-9)
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