Weather wasn't great at the time but not out of the ordinary for the time of year. Structural failure???
The flight left KVUO around 2320Z, and the accident was about halfway between KSPB and KKLS. I have no idea what happened, but there was not a lot of sky available for doing primary maneuvers that afternoon.
KVUO 150153Z AUTO 11010KT 10SM -RA BKN020 BKN025 OVC030 06/04 A2981
KVUO 150053Z AUTO 12009KT 10SM -RA BKN023 BKN029 OVC034 06/04 A2982
KVUO 150015Z 12008KT 10SM -RA BKN024 OVC031 07/05 A2982
KVUO 150008Z 11007KT 10SM -RA SCT024 OVC031 08/05 A2982
KVUO 142353Z 11006KT 10SM -RA BKN024 OVC031 08/06 A2982
KSPB 150153Z AUTO 14006KT 9SM -RA BKN008 OVC015 07/07 A2978
KSPB 150134Z AUTO 13005KT 6SM -RA BR BKN008 OVC013 08/07 A2979
KSPB 150116Z AUTO 00000KT 6SM -RA BR BKN011 OVC017 07/07 A2979
KSPB 150053Z AUTO 08005KT 5SM RA BR OVC017 08/07 A2980
KKLS 150155Z 16005KT 9SM FEW026 SCT042 OVC055 08/06 A2978
KKLS 150135Z 16004KT 10SM FEW030 FEW042 OVC049 08/06 A2978
KKLS 150115Z 17004KT 10SM OVC049 08/06 A2979
KKLS 150055Z 15006KT 10SM BKN049 OVC060 08/06 A2979
KKLS 150035Z 15009KT 10SM BKN048 OVC060 08/06 A2979
KKLS 150015Z 15010KT 10SM OVC060 08/06 A2980 RMK AO1
KKLS 142355Z 14011G14KT 10SM SCT041 SCT047 OVC060 08/06 A2980