# Proposed AD 99-NM-170-AD: McDonnell Douglas Model MD-11 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-03-12
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 27, 1999, 64 FR 57822
- Comments due: December 13, 1999
- Became: [AD 2000-03-12](https://openairdocs.org/ad/2000-03-12)
- Docket: 99-NM-170-AD
- FR document: 99-27946
- Official PDF: https://openairdocs.org/files/sha256/61/3c/613cacb704c7fe51071f213df966ca2a0794e382ea7b67b2d783333c89ca98e5 (from https://www.govinfo.gov/content/pkg/FR-1999-10-27/pdf/99-27946.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/10/27/99-27946/airworthiness-directives-mcdonnell-douglas-model-md-11-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-170-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 the air driven generator (ADG) wire assembly with a new, increased length wire assembly. This proposal is prompted by a report of loose terminal attachment hardware on the ADG power monitor relay due to a stress condition on the terminal attachment points. The actions specified by the proposed AD are intended to prevent loss of the charging capability of the aircraft battery. Loss of the charging capability of the aircraft battery, coupled with a loss of all normal electrical power, could prevent continued safe flight and landing of the airplane.

## Notices in this docket

- Oct 27, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-27946, comments due Dec 13, 1999 (https://www.federalregister.gov/documents/1999/10/27/99-27946/airworthiness-directives-mcdonnell-douglas-model-md-11-series-airplanes)

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