# Proposed AD 99-SW-54-AD: MD Helicopters Inc. Model MD600N Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-04-21
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 8, 1999, 64 FR 68646
- Comments due: February 7, 2000
- Became: [AD 2000-04-21](https://openairdocs.org/ad/2000-04-21)
- Docket: 99-SW-54-AD
- FR document: 99-31817
- Official PDF: https://openairdocs.org/files/sha256/23/c4/23c4e27fa7aba1b399e0fa61ba32ac296fe4b58c30104130739996b4389543c0 (from https://www.govinfo.gov/content/pkg/FR-1999-12-08/pdf/99-31817.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/12/08/99-31817/airworthiness-directives-md-helicopters-inc-model-md600n-helicopters
- Page: https://openairdocs.org/proposed/99-SW-54-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) applicable to MD Helicopters Inc. (MDHI) Model MD600N helicopters. This proposal would require inspecting each internal fuel hose connection to verify proper installation. This proposal is prompted by the discovery that certain fuel hose connections between the fuel cells and the engine can be incorrectly installed. The actions specified by the proposed AD are intended to prevent fuel starvation of the engine while the fuel gage indicates fuel remaining in the tank, engine flameout, and a subsequent forced landing.

## Notices in this docket

- Dec 8, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-31817, comments due Feb 7, 2000 (https://www.federalregister.gov/documents/1999/12/08/99-31817/airworthiness-directives-md-helicopters-inc-model-md600n-helicopters)

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