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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
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.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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