CEN12CA044

NTSB accident investigation · Aviat A-1 · Wolverton, MN · October 20, 2011

Accident · No injuriesData collectionFinal report
Date
October 20, 2011, 15:45 local (20:45 UTC)
Place
Wolverton, MN
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N93HUAviat A-1
Defining event
Landing-landing roll: Nose over/nose down
Weather
Visual (VMC) · Day
Status
Completed · report December 27, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA-Minneapolis FSDO
FAA report
20111020024839A
Case key
82188

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's inadvertent excessive braking during the landing roll due to momentary pain.

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.

Impairment/incapacitationPersonnel issues › Physical · PilotAviat A-1: 1 caseAll aircraft: 40 casesProbable cause
Landing gear system: brakeAircraft › Aircraft systems · Incorrect use/operationAviat A-1: 1 caseAll aircraft: 297 casesProbable cause

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 on the landing roll on a grass field, he experienced a sharp pain in his left leg as he was applying the brakes. He inadvertently applied excessive braking and the airplane nosed over. The airplane came to rest on its back and sustained substantial damage to the fuselage, rudder, and vertical stabilizer. The pilot reported no mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Factual narrative

The pilot reported that while landing off-airport in a grass field, he experienced a sharp pain in his left leg as he was applying the brakes. This caused him to inadvertently apply excessive braking and the airplane nosed over. The airplane came to rest on its back and sustained substantial damage to the fuselage, rudder, and vertical stabilizer. The pilot reported no mechanical failures or malfunctions of the airplane.

Aircraft

Registration
N93HU
Reported as
Aviat A-1
Category
Airplane
Serial number
1249
Airframe hours
360
Engine
Lycoming O-360-A1D, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Utility
Last inspection
Annual · July 21, 2011
Departed
D54 · Fargo, ND
Destination
D54 · Fargo, ND

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
64
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
June 28, 2010
Seat
Front
Flight hours
302 total · 151 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
50 °F
Altimeter
28.81 inHg
Observed at
FAR, 20 nm away

Docket · 2

The files NTSB released with the investigation on November 18, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 754 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 N93HU · 1

Matched to the same aircraft by N-number and date.