Date:	Sunday 22 September 1974
Time:	0:38 LT
Type:	Piper PA-30-160 Twin Comanche
Owner/operator:	Bryan Everald Unke
Registration:	N8307Y
MSN:	30-1446
Fatalities:	Fatalities: 2 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Destroyed
Category:	Accident
Location:	near Belle Fourche, Butte County, South Dakota -   United States of America
Phase:	Take off
Nature:	Private
Departure airport:	St. Thomas Municipal Airport, North Dakota (FAA LID: 4S5)
Destination airport:	South Lake Tahoe, California (TVL/KTVL)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
Written off (destroyed) September 22, 1974 when crashed at night near Belle Fourche, Butte County, South Dakota (at approximate co ordinates 44°40′3″N 103°51′1″W): cause of accident attributed to a CFIT (Controlled Flight Into Terrain). The pilot's blood alcohol level was 165 mg%.

Aircraft struck ground in a slight nose down left wing low attitude. Aircraft was en route between St. Thomas Municipal Airport, North Dakota (FAA LID; 4S5) and South Lake Tahoe, California (TVL/KTVL). Both persons on board (pilot and one passenger) were killed. According to the following excerpt from the official NTSB report into the accident:

"PROBABLE CAUSE(S)
PILOT IN COMMAND - MISJUDGED ALTITUDE AND CLEARANCE - PHYSICAL IMPAIRMENT - ALCOHOLIC IMPAIRMENT OF EFFICIENCY AND JUDGMENT
FACTOR(S)
MISCELLANEOUS ACTS,CONDITIONS - PILOT FATIGUE"

One of the two fatalities was named as Bryan Everald Unke (see link #4) but it is not clear if he was the pilot or the passenger.

1. NTSB Identification: MKC75AK022 at https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=39074&key=0
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=8307Y
3. http://planecrashmap.com/plane/sd/N8307Y/
4. https://www.findagrave.com/memorial/45340233

Date/time	Contributor	Updates
25-Feb-2008 12:00	ASN archive	Added
05-Feb-2017 17:35	Dr.John Smith	Updated [Time, Aircraft type, Operator, Location, Phase, Nature, Departure airport, Destination airport, Source, Narrative, ]