- Date
- September 25, 2019, 19:00 local (Sep 26, 2019, 03:00 UTC)
- Place
- Tyonek, AK
- Injuries
- 1 serious, 1 minor
- Damage
- Substantial damage
- Phase of flight
- Initial climb
- Aircraft
- N6533MStinson 108
- Defining event
- Initial climb: Loss of lift
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- Investigation class
- Class 4 - Basic report with no Prelim publish
- NTSB office
- Alaska Regional Office
- Parties
- FAA FSDO
- FAA report
- 20190925015729A
- Case key
- 100339
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 exceedance of the airplane’s critical angle of attack during a short field takeoff, which resulted in an aerodynamic stall and loss of control.
Findings · 3
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 reported that during a short field takeoff from a small unimproved airstrip, as the airplane climbed through tree top altitude, the indicated airspeed decreased by 20-30 knots and the left wing dropped rapidly. The airplane descended and impacted trees beyond the airstrip. The wings and fuselage sustained substantial damage and the pilot sustained serious injuries. The passenger sustained minor injuries. The pilot stated that there were no mechanical malfunctions or failures that would have precluded normal operation and that the wind likely diminished during a critical phase of the climb out, and due to the slow airspeed, the left wing stalled resulting in an uncontrolled left roll.
Aircraft
- Registration
- N6533M
- Reported as
- Stinson 108 (3)
- Category
- Airplane
- Serial number
- 108-4533
- Engine
- Franklin 6A4165 SERIES, 165 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Airworthiness certificate
- Standard, Normal
- Departed
- Tyonek, AK
- Destination
- SXQ · Soldotna, AK
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
- 65
- Injuries
- Serious
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, With waivers/limitations
- Seat
- Front
- Flight hours
- 800 total · 800 in this make and model · 800 as pilot in command · 30 in the last 90 days · 6 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 250° at 9 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 48 °F, dew point 32 °F
- Altimeter
- 29.91 inHg
- Observed at
- PAEN, 31 nm away
Docket · 3
The files NTSB released with the investigation on August 20, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 971 KB 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.