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Date:Friday 29 December 2006
Type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different
Beechcraft 99 Airliner
Operator:Alpine Aviation
Registration: N99TH
MSN: U-155
First flight: 1974
Total airframe hrs:39795
Engines: 2 Pratt & Whitney Canada PT6A-27
Crew:Fatalities: 0 / Occupants: 1
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Aircraft fate: Written off (damaged beyond repair)
Location:16 km (10 mls) S of Rapid City Regional Airport, SD (RAP) (   United States of America)
Phase: Approach (APR)
Departure airport:Pierre Airport, SD (PIR/KPIR), United States of America
Destination airport:Rapid City Regional Airport, SD (RAP/KRAP), United States of America
Flightnumber: 408
The airplane was on an instrument flight rules flight in night instrument meteorological conditions when the accident occurred. The airplane had been cleared for an ILS approach and the pilot elected to use a non-published procedure to intercept the final approach. After becoming established on the final approach, the airplane impacted the ground about 7 miles from the destination airport at an elevation approximately the same as the airport elevation.
Post accident examination of the altimeters revealed that the number one altimeter read 360 feet high. No determination was made as to whether the discrepancy existed prior to impact. However, the pilot did not report any pre-flight discrepancies with regard to the airplane's altimeters.

Probable Cause:

PROBABLE CAUSE: "The pilot's failure to follow the published instrument approach procedure which contributed to his failure to maintain altitude and clearance from terrain during the instrument approach. A factor was the night light condition."

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 3 months
Accident number: CHI07LA050
Download report: Summary report
Language: English

Controlled Flight Into Terrain (CFIT) - Ground

» NTSB Identification: CHI07LA050


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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 Pierre Airport, SD to Rapid City Regional Airport, SD as the crow flies is 222 km (139 miles).

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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Beech 99

  • 239 built
  • 47th loss
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