- Date
- September 12, 2021, 09:00 local (17:00 UTC)
- Place
- Port Alsworth, AK
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N6476MStinson 108-3
- Defining event
- Landing-landing roll: Loss of control on ground
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- Investigation class
- Class 3
- NTSB office
- Alaska Regional Office
- Parties
- Federal Aviation Administration (FAA)
- Case key
- 103847
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
A loss of directional control for reasons that could not be determined based on the available information.
Findings · 1
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 the landing roll while applying the brakes, the right brake “went flat.” The airplane veered to the left, impacted a stump, and nosed over, resulting in substantial damage to the fuselage and left wing. A postaccident examination revealed no mechanical anomalies with the brake system that would have precluded normal operation. Based on the available information, the reason for the loss of control during landing could not be determined.
Factual narrative
On September 12, 2021, about 0900 Alaska daylight time, a Stinson 108-3, N6476M, was substantially damaged when it was involved in an accident near Port Alsworth, Alaska. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that, during the landing roll while applying the brakes, the right brake “went flat.” The airplane veered to the left, impacted a stump, and nosed over, resulting in substantial damage to the fuselage and left wing. A postaccident examination revealed no mechanical anomalies with the brake system that would have precluded normal operation.
Aircraft
- Registration
- N6476M
- Reported as
- Stinson 108-3
- Category
- Airplane
- Serial number
- 108-4476
- Built
- 1948
- Airframe hours
- 2,729.6
- Engine
- Continental O-470-S, 230 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · June 25, 2021
- Destination
- Same as departure
- Airport
- PVT · Pvt, runway PVT, 720 × 50 ft, gravel
- Equipment
- None
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
- 30
- Injuries
- None
- Certificates
- Flight instructor, Commercial
- Airplane ratings
- Single-engine sea, Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, Without waivers/limitations
- Last flight review
- April 12, 2021
- Seat
- Left
- Restraint
- Lap only
- Flight hours
- 5,006.2 total · 33 in this make and model · 4,796.1 as pilot in command · 350.3 in the last 90 days · 104.6 in the last 30 days
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 70° at 8 knots
- Visibility
- 30 statute miles
- Lowest ceiling
- 8,000 ft broken
- Temperature
- 54 °F, dew point 45 °F
- Altimeter
- 29.58 inHg
- Observed at
- PALJ
- METAR
- PALJ 121653Z 07008KT 30SM BKN080 OVC120 12/07 A2958 RMK EST PASS OPN NOSPECI
Docket · 4
The files NTSB released with the investigation on January 31, 2023, on NTSB’s docket system: statements, records, photos and specialists’ reports. 6.1 MB in all.