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RTCA DO-309
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RTCA DO-309 2008 Edition, March 13, 2008 Minimum Operational Performance Standards (MOPS) for Helicopter Terrain Awareness and Warning System (HTAWS) Airborne Equipment
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Description / Abstract:
This MOPS defines a Helicopter Terrain Awareness and Warning System (HTAWS), Airborne System. The HTAWS is an alerting system intended to provide terrain and obstacle aural and visual alerts. It is designed to reduce the risk of Controlled Flight into Terrain (CFIT) accidents by providing increased situational awareness of the surrounding terrain and obstacles, mainly during the cruise phase in Visual Meteorological Condition (VMC) and in Instrument Meteorological Condition (IMC) under Instrument Flight Rules (IFR). HTAWS is not intended to be used as an aid for navigation.