- Date
- December 11, 2012, 09:00 local (15:00 UTC)
- Place
- Okaton, SD
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Takeoff
- Aircraft
- N3471ZPiper PA-18-150
- Defining event
- Takeoff: Loss of control in flight
- Weather
- Visual (VMC) · Day
- Status
- Completed · report April 3, 2013
- Report
- Approved by Office Director
- NTSB office
- Central Region
- Parties
- FAA - Rapid City FSDO
- FAA report
- 20121211027059A
- Case key
- 85841
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 perform an adequate preflight inspection of the airplane and obstruction of the aileron control system by snow and ice, which led to a loss of control during flight.
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 2 days before the accident, snow accumulated on the airplane’s wings while it was parked in an open front hangar. The day before the accident, the temperature was warmer, and the pilot believed that the snow melted and ran rearward to the aileron gap/hinge locations, re-freezing during the nighttime hours. On the day of the accident, the pilot was in a hurry to use the airplane to check his pastures and brushed the snow off of the wings but did not perform a thorough preflight check of the airplane, including checking freedom of movement of the ailerons. After takeoff, the airplane began turning to the left. The pilot attempted to correct the turn, but the airplane did not respond. When he looked out at the wings, he could see that the ailerons were not responding to control inputs as they should. As he was attempting to regain control, the airplane descended into trees, resulting in substantial damage to both wings, the fuselage, and tail surfaces. A postaccident examination of the airplane revealed no mechanical defects that were determined to have existed before the accident.
Factual narrative
The pilot reported that two days prior to the accident, snow accumulated on the wings of the airplane while it was in an open front hangar. The day prior to the accident the temperature was warmer and the pilot believed that the snow melted and ran rearward to the aileron gap/hinge locations, re-freezing during the nighttime hours. The day of the accident the pilot said he was in a hurry to use the airplane to check his pastures and brushed the snow off of the wings, but did not perform a thorough preflight check of the airplane and did not check freedom of movement of the ailerons. After takeoff, the airplane began turning to the left. The pilot said that he attempted to correct, but there was no response. When he looked out at the wings, he could see that the ailerons were not responding to control inputs as they should. As he was attempting to regain control, the airplane descended into trees. A postaccident examination of the airplane revealed no defects that were determined to have existed prior to the accident. The airplane sustained substantial damage to both wings, the fuselage and tail surfaces.
Aircraft
- Registration
- N3471Z
- Reported as
- Piper PA-18-150
- Category
- Airplane
- Serial number
- 18-7291
- Engine
- Lycoming O-320 SERIES, 150 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Airworthiness certificate
- Standard, Normal
- Departed
- PVT · Okaton, SD
- Destination
- PVT · Okaton, SD
- Airport
- PVT · Private airstrip, runway 09, grass/turf
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
- 54
- Injuries
- None
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, With waivers/limitations
- Seat
- Front
- Flight hours
- 2,000 total · 600 in this make and model
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 320° at 5 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- 9,500 ft overcast
- Temperature
- 19 °F, dew point 16 °F
- Altimeter
- 29.85 inHg
- Observed at
- PHP, 37 nm away
Docket · 1
The files NTSB released with the investigation on January 16, 2013, on NTSB’s docket system: statements, records, photos and specialists’ reports. 102 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.
Other investigations on N3471Z · 1
Matched to the same aircraft by N-number and date.