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NTSB Report
February 17, 1989 · Mitsubishi MU-2B-35J · N54US
Spokane, WA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
February 17, 1989
Injury Outcomes
No injuries (1 uninjured)
Location
Spokane, WA
Aircraft
Mitsubishi MU-2B-35J
Tail Number
N54US
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA89LA061
WHILE LANDING AT DAWN WITH SNOW & ICE ON THE RWY, THE ACFT DRIFTED LEFT INTO RUNWAY LIGHTS, WHICH WERE BURIED IN A SNOW BERM FROM PREVIOUS PLOWING. THE PLT SAID THERE WAS 16 INCHES OF SNOW ON THE GND & UP TO 2 INCHES ON THE RWY. HE SAID HE THOUGHT HE HAD LANDED ON THE CENTERLINE, LOST CONTROL IN A SNOWDRIFT, THEN THE ACFT DRIFTED INTO SNOW ADJACENT TO THE RWY.
NTSB Probable Cause
THE FAILURE OF THE PILOT TO MAINTAIN DIRECTIONAL CONTROL AND RUNWAY ALIGNMENT DURING THE LANDING ROLL. FACTORS RELATED TO THE ACCIDENT WERE: LIGHT CONDITIONS AT DAWN, SNOW AND ICE ON THE RUNWAY, AND THE RUNWAY LIGHTS.
Full Narrative
WHILE LANDING AT DAWN WITH SNOW & ICE ON THE RWY, THE ACFT DRIFTED LEFT INTO RUNWAY LIGHTS, WHICH WERE BURIED IN A SNOW BERM FROM PREVIOUS PLOWING. THE PLT SAID THERE WAS 16 INCHES OF SNOW ON THE GND & UP TO 2 INCHES ON THE RWY. HE SAID HE THOUGHT HE HAD LANDED ON THE CENTERLINE, LOST CONTROL IN A SNOWDRIFT, THEN THE ACFT DRIFTED INTO SNOW ADJACENT TO THE RWY.
Flight
Event TypeAccident
Event Time07:13 PST
Nearest AirportSpokane Int'L (0nm N)
Runway3
Runway Length9000 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMitsubishi MU-2B-35J
Tail NumberN54US
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 135
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · TPE-331-6 · Turboprop · 715
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 44 · First Class
Conditions
ConditionsIMC
LightDawn
Wind40° @ 11 kt
Visibility2 sm
Ceiling900 ft
Temperature / Dew Point16 C / 12 C
Altimeter30.00 inHg
Observation Time14:54
Weather SourceWFAC