# Proposed AD 2001-NM-104-AD: McDonnell Douglas Model DC-9-10, -20, -30, and -40 Series Airplanes and C-9 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-24-25
- Products: McDonnell Douglas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 23, 2001, 66 FR 38198
- Comments due: September 6, 2001
- Became: [AD 2001-24-25](https://openairdocs.org/ad/2001-24-25)
- Docket: 2001-NM-104-AD
- FR document: 01-17598
- Official PDF: https://openairdocs.org/files/sha256/0e/ad/0ead1c43e699ac2d94778f078cb7d935891bfbdc2e891fa59c0b2c35eda9f8cc (from https://www.govinfo.gov/content/pkg/FR-2001-07-23/pdf/01-17598.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/07/23/01-17598/airworthiness-directives-mcdonnell-douglas-model-dc-9-10--20--30-and--40-series-airplanes-and-c-9
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5726A386FFFD49A086256A96005D04BB.0001
- Page: https://openairdocs.org/proposed/2001-NM-104-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, and -40 series airplanes and C-9 airplanes. This proposal would require modification of the spoiler control system, and installation of protective interlock box assemblies in the spoiler circuit. This action 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.

## Notices in this docket

- Jul 23, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-17598, comments due Sep 6, 2001 (https://www.federalregister.gov/documents/2001/07/23/01-17598/airworthiness-directives-mcdonnell-douglas-model-dc-9-10--20--30-and--40-series-airplanes-and-c-9)

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