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February 20, 2020 · Cessna 172 S · N370SP
Boulder, CO
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
February 20, 2020
Injury Outcomes
No injuries (2 uninjured)
Location
Boulder, CO
Aircraft
Cessna 172 S (2003)
Tail Number
N370SP
Operator
Rocky Mountain Flight Consultants
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CEN20CA094
The pilot departed from a snow-packed runway, flew locally for about 2 hours, and then returned to land. The pilot stated that, while in the traffic pattern preparing to land, the runway still appeared to be snow-packed like it was during the departure. However, the runway was actually slush covered with patches of ice due to the morning sun melting the previously hard snow, and the airplane veered left during the landing roll. The pilot was unable to maintain directional control, and the airplane subsequently impacted a snowbank on the edge of the runway and nosed over, which resulted in substantial damage to both wings and the vertical stabilizer.
NTSB Probable Cause
Environmental issues-Physical environment-Runway/land/takeoff/taxi surface-Snow/slush/ice covered surface-Effect on operation - C
Full Narrative
The pilot and passenger departed from the uncontrolled airport on a snow packed runway and flew locally for about 2 hours, then returned to land. The pilot stated that while in the traffic pattern preparing to land, the runway appeared to be in the same condition as during the departure. Instead, the runway was slush covered due to the morning sun melting the snow and the airplane veered to the left during landing rollout. The pilot was unable to maintain directional control and the airplane subsequently impacted a snowbank on the edge of the runway and nosed over, which damaged both wings and the vertical stabilizer.
Flight
Event TypeAccident
Event Time11:00 MST
Nearest AirportBoulder Muni (0nm)
Runway08
Runway Length4100 ft
Runway Width75 ft
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172 S
Tail NumberN370SP
Aircraft CategoryAir
DamageSubstantial
OperatorRocky Mountain Flight Consultants
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-360-L2A · Reciprocating · 180
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 33 · Third Class · None
Crew 2None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point23 C / 7 C
Altimeter30.52 inHg
Observation Time18:12
Weather SourceWFAC