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Accident Report Detail

Safety Recommendation Report: Guidance on the Issuance of Turbulence Products and Training for Low-Level Turbulence Identification and Forecasting for National Weather Service Forecasters

Executive Summary

​The National Transportation Safety Board (NTSB) is providing the following information to urge the National Weather Service (NWS) to take action on the safety recommendations in this report. We identified these issues during our ongoing investigation of a fatal accident involving a Pilatus PC-12 airplane, N933DC, that impacted terrain near Rick Husband Amarillo International Airport (AMA), Amarillo, Texas. The NTSB is issuing two safety recommendations to the NWS.

Probable Cause


To the National Weather Service:

Revise National Weather Service Instruction 10-811 to include guidance on the issuance of airmen’s meteorological information advisories and other products that advise of nonconvective turbulence hazards when convective significant meteorological information advisories are active, or may be issued, in the same region. (A-18-21)

Develop and provide formal training to your aviation weather forecasters on the analysis, interpretation, and forecasting of low-level turbulence. (A-18-22)

Accident Location: Amarillo , TX USA  
Accident Date: 4/28/2017
Accident ID: CEN17FA168

Date Adopted: 8/2/2018
NTSB Number: ASR1803
NTIS Number:  

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