- Date
- July 25, 2021, 13:44 local (19:44 UTC)
- Place
- Bozeman, MT · Airport Environment - runway
- Injuries
- 2 minor
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N8844KStinson 108-1
- Defining event
- Landing-landing roll: Loss of control on ground
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- Investigation class
- Class 4 - Basic report with no Prelim publish
- NTSB office
- Western Pacific Region
- Parties
- Federal Aviation Administration
- FAA report
- 20210725011829A
- Case key
- 103566
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
The pilot’s failure to maintain directional control during landing which resulted in a ground loop.
Findings · 2
NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.
Sequence of events
The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.
Analysis
The pilot in the tailwheel-equipped airplane reported that, he made a normal wheel landing and as he was about to lower the tailwheel, the airplane veered to the right. He attempted to correct with left rudder control, but the airplane ground looped. The pilot opined that the airplane may have been caught by a wind gust, which started an oscillation that he was not able to correct for. The airplane sustained substantial damage to the left wing and lift strut. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operations.
Aircraft
- Registration
- N8844K
- Reported as
- Stinson 108-1
- Category
- Airplane
- Serial number
- 108-1844
- Built
- 1947
- Engine
- Franklin 6A4-150-B3, 150 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Airworthiness certificate
- Standard, Normal; Standard, Utility
- Departed
- S83 · Shoshone, ID
- Destination
- Same as departure
- Airport
- BZN · Bozeman Yellowstone Intl, runway 12/30, 8,994 × 150 ft, asphalt
- Equipment
- ADS-B, Electronic flight bag or handheld device
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
- 36
- Injuries
- None
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Without waivers/limitations
- Last flight review
- September 1, 2020
- Seat
- Left
- Restraint
- 4-point
- Flight hours
- 109 total · 66 in this make and model · 70 as pilot in command · 25 in the last 90 days · 11 in the last 30 days · 7 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 340° at 3 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 84 °F, dew point 37 °F
- Altimeter
- 30.10 inHg
- Observed at
- KBZN, 1 nm away
- METAR
- KBZN 251856Z 34003KT 10SM CLR 29/03 A3010 RMK AO2 SLP153 T02940033
Docket · 2
The files NTSB released with the investigation on October 12, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.6 MB in all.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.