scope:

PURPOSE AND SCOPE

INTRODUCTION

This document defines the Minimum Operational Performance Standards (MOPS) for an Onshore Helicopter Terrain Awareness and Warning System (Onshore HTAWS), which provide alerting to reduce the risk of controlled flight into terrain accidents, as a supplement to the Forward Looking Terrain Avoidance (FLTA) HTAWS functions defined in DO-309. Onshore HTAWS modes are similar to Offshore HTAWS modes defined in DO-376/ED-285. These standards specify system characteristics that are intended to be useful to designers, manufacturers, installers, and users of Onshore HTAWS.

The term "Onshore HTAWS" as used herein includes all the functional components necessary to properly perform the intended function. However, all external components to the function which are cockpit, aircraft, or system specific, though necessary for proper operation of the function at a system level, are out of the scope of the system requirements (e.g., cockpit controls, cockpit indicators, cockpit displays, aural systems, inputs, and sensors). Note that any databases that might be required by the Onshore HTAWS are not considered to be part of the system as defined in this document.