The investigation into the April 28, 2017, loss of a Pilatus PC-12 air ambulance in Texas near Rick Husband Amarillo International Airport (KAMA) was undergoing final review at this writing; nevertheless, the NTSB has issued a recommendation to the National Weather Service (NWS) that it review and clarify its issuance of turbulence advisories — especially for low-level altitudes. “Based on weather model, weather radar and other data, the NTSB [became] concerned that low-level ...


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