# Proposed AD 99-NM-71-AD: McDonnell Douglas MD-11 and MD-11F Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-25-14
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 10, 1999, 64 FR 43316
- Comments due: September 24, 1999
- Became: [AD 99-25-14](https://openairdocs.org/ad/99-25-14)
- Docket: 99-NM-71-AD
- FR document: 99-20503
- Official PDF: https://openairdocs.org/files/sha256/8a/6b/8a6b813a00aa29f08c45d4831154264dd024b1ff3bc7dca3499e0558e1648715 (from https://www.govinfo.gov/content/pkg/FR-1999-08-10/pdf/99-20503.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/08/10/99-20503/airworthiness-directives-mcdonnell-douglas-md-11-and-md-11f-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-71-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas MD-11 and MD-11F series airplanes. This proposal would require a one-time inspection to determine if metallic transitions are installed on wire harnesses of the tail tank fuel transfer pumps, and to determine if damaged wires are present; and repair, if necessary. This proposal also would require repetitive inspections of the repaired area; and a permanent modification of the wire harnesses if metallic transitions are not installed, which would terminate the repetitive inspections. This proposal is prompted by a report of chafing and damage to a wire harness of a tail tank fuel transfer pump. The actions specified by the proposed AD are intended to prevent wire chafing and damage, which could result in an inoperative fuel transfer pump and/or an increased risk of a fire or explosion from a fuel leak.

## Notices in this docket

- Aug 10, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-20503, comments due Sep 24, 1999 (https://www.federalregister.gov/documents/1999/08/10/99-20503/airworthiness-directives-mcdonnell-douglas-md-11-and-md-11f-series-airplanes)

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