- Date
- January 19, 1990, 15:44 local (22:44 UTC)
- Place
- Broomfield, CO
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Takeoff
- Aircraft
- N99SRMitsubishi MU-2B-25
- Weather
- Instrument (IMC) · Day
- Status
- Completed · report September 29, 1992
- Report
- Approved by Office Director
- Case key
- 17884
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
Loss of directional control by the pilot, during takeoff ground run. Contributing to this accident were a loss of power on the left engine due to snow ingestion, heavy snow showers in progress and an icy, snow covered runway.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
The pilot said that during takeoff ground roll, the left engine lost RPM. The pilot lost directional control and the plane departed the left side of the runway. The plane struck a runway sign and 2 runway lights. It then skidded sideways for 3000 feet, crossed the runway and nosed down in a ditch. There were heavy snow showers in progress at the time of the acdnt and the runway was covered by snow.
Aircraft
- Registration
- N99SR
- Reported as
- Mitsubishi MU-2B-25
- Category
- Airplane
- Serial number
- 315
- Airframe hours
- 1,642
- Engine
- Garrett TPE-331, 840 horsepower, turbo prop
- Damage
- Substantial damage
- Fire
- On-Ground
- Flight
- Business · Part 91
- Registered owner
- Dewey H. Cosgrove
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · August 14, 1989 · 80 hours before
- Departed
- BJC
- Destination
- CFW · Crestview, FL
- Flight plan
- IFR
- Airport
- BJC · Jefferson County, runway 29R, 9,000 × 100 ft, asphalt
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 55
- Certificates
- Airline transport, Flight instructor
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--w/ waivers/lim
- Seat
- Left
- Flight hours
- 20,963 total · 2,075 in this make and model · 14,239 as pilot in command · 66 in the last 90 days · 44 in the last 30 days · 5 in the last 24 hours
Weather
- Conditions
- Instrument (IMC) · Day
- Wind
- 350° at 9 knots
- Lowest ceiling
- 200 ft
- Temperature
- 23 °F, dew point 21 °F
- Altimeter
- 29.00 inHg