Rotorcraft
FAA Proposes HTaws Changes

The FAA is proposing changes to installation guidance (AC 27-1B) regarding helicopter terrain awareness and warning systems (HTaws). HTaws is required for air ambulance operations under 14 CFR Part 135 Subpart L. Functionality and performance requirements for HTaws were previously established in TSO-C194 and this new proposed advisory circular does not change that. However, it does suggest several changes to make HTaws more effective in the operational environment.

These changes include a “reduced-protection mode” for off-airfield operations as a way of minimizing nuisance alerts without compromising essential alerts. The FAA notes that “without a reduced-protection or similar mode, nuisance alerts may lead to pilots’ ignoring or inhibiting the HTaws at inappropriate times.”

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