# Proposed AD 99-NM-169-AD: McDonnell Douglas Model MD-11 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-03-11
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 27, 1999, 64 FR 57818
- Comments due: December 13, 1999
- Became: [AD 2000-03-11](https://openairdocs.org/ad/2000-03-11)
- Docket: 99-NM-169-AD
- FR document: 99-27944
- Official PDF: https://openairdocs.org/files/sha256/37/d9/37d968bc763277f694576c1e4ee3b0e35c7cc94573d5f10a95d28f77e8db2a1f (from https://www.govinfo.gov/content/pkg/FR-1999-10-27/pdf/99-27944.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/10/27/99-27944/airworthiness-directives-mcdonnell-douglas-model-md-11-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-169-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model MD-11 series airplanes. This proposal would require replacement of 10 amp circuit breakers with 5 amp circuit breakers in the left and right windshield anti-ice power controllers; and replacement of the anti-ice control panel with a new or modified panel, or modification and reidentification of the anti-ice control panel. This proposal is prompted by reports of smoke and sparks emanating from the anti-ice control panel in the cockpit. The actions specified by the proposed AD are intended to prevent burnt internal circuit boards caused by a short in either the engine or airfoil anti-ice valve, or the windshield anti- ice controller, which could result in smoke in the cockpit.

## Notices in this docket

- Oct 27, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-27944, comments due Dec 13, 1999 (https://www.federalregister.gov/documents/1999/10/27/99-27944/airworthiness-directives-mcdonnell-douglas-model-md-11-series-airplanes)

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