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NTSB Report
December 28, 2019 · Cessna 170 B · N4476B
Missoula, MT
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
December 28, 2019
Injury Outcomes
No injuries (2 uninjured)
Location
Missoula, MT
Aircraft
Cessna 170 B (1955)
Tail Number
N4476B
Injuries
None
Aircraft Damage
Substantial
NTSB Number
WPR20CA053
The pilot, who was receiving instruction for his tailwheel endorsement, reported that, during the takeoff roll, the airplane began to veer left. He applied corrective control inputs, and the flight instructor called for him to abort the takeoff, but the airplane ground looped and departed the runway. The airplane sustained substantial damage to the right wing and aileron. The instructor reported that the event happened too fast for him to correct the diversion and that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.
NTSB Probable Cause
The pilot receiving instruction's failure to maintain directional control during the takeoff roll, which resulted in a runway excursion and ground-loop, and the flight instructor’s failure to adequately monitor the pilot.
Full Narrative
The pilot reported that, during the takeoff roll in the tailwheel equipped airplane, it began to veer to the left. He applied corrective control inputs, and the flight instructor called for him to abort the takeoff, but the airplane ground looped as it departed the runway. The airplane sustained substantial damage to the right wing and aileron. Both pilots were flight instructors, and the pilot at the controls was receiving instruction for his tailwheel endorsement. The flight instructor providing instruction stated that the event happened too fast for him to correct the diversion. Neither pilot reported a preaccident mechanical failure or malfunction with the airplane that would have precluded normal operation.
Flight
Event TypeAccident
Event Time13:45 MST
Nearest AirportMissoula Intl (0nm ESE)
Runway12
Runway Length9501 ft
Runway Width150 ft
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 170 B
Tail NumberN4476B
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-300-A · Reciprocating · 145
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 63 · Second Class · None
Crew 2Age 68 · Basc · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingOvercast 5000 ft
Temperature / Dew Point30 C / 18 C
Altimeter30.15 inHg
Observation Time20:53
Weather SourceWFAC