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NTSB Report
January 19, 1990 · Mitsubishi MU-2B-25 · N99SR
Broomfield, CO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
January 19, 1990
Injury Outcomes
No injuries (2 uninjured)
Location
Broomfield, CO
Aircraft
Mitsubishi MU-2B-25
Tail Number
N99SR
Operator
Cosco Associate
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN90LA047
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.
NTSB 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.
Full Narrative
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.
Flight
Event TypeAccident
Event Time15:44 MST
Nearest AirportJefferson County (0nm N)
Runway29R
Runway Length9000 ft
Runway Width100 ft
Flight Plan FiledIFR
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftMitsubishi MU-2B-25
Tail NumberN99SR
Aircraft CategoryAir
DamageSubstantial
OperatorCosco Associate
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · TPE-331 · Turboprop · 840
Seats6
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 55 · Second Class
Conditions
ConditionsIMC
LightDaylight
Wind350° @ 9 kt
Ceiling200 ft
Temperature / Dew Point23 C / 21 C
Altimeter29.00 inHg
Weather SourcePILO