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Last updated: 19 September 2019
Status:Final
Date:Monday 28 December 1970
Time:18:37
Type:Silhouette image of generic H25A model; specific model in this crash may look slightly different
de Havilland DH-125-1A
Operator:Morrison-Knutsen
Registration: N36MK
C/n / msn: 25073
First flight: 1966-01-24 (4 years 11 months)
Crew:Fatalities: 2 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 2 / Occupants: 2
Aircraft damage: Damaged beyond repair
Location:16 km (10 mls) NE of Boise, ID (   United States of America)
Phase: Approach (APR)
Nature:Executive
Departure airport:Billings-Logan Field, MT (BIL/KBIL), United States of America
Destination airport:Boise Air Terminal, ID (BOI/KBOI), United States of America
Narrative:
Improper instrument approach to runway 10L caused the plane to fly into the slope of a mountain. Misreading of the altimeter was a causal factor.

Probable Cause:

PROBABLE CAUSE:
pilot in command - improper IFR operation
pilot in command - failed to follow approved procedures,directives,etc.
miscellaneous acts, conditions - instruments-misread or failed to read

Classification:
Controlled Flight Into Terrain (CFIT) - Mountain

Sources:
» NTSB


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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Billings-Logan Field, MT to Boise Air Terminal, ID as the crow flies is 651 km (407 miles).
Accident location: Approximate; accuracy within a few kilometers.

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