CEN09CA210

NTSB accident investigation · Aeronca 7AC · Bagley, MN · March 15, 2009

Accident · No injuriesData collectionFinal report
Date
March 15, 2009, 17:00 local (22:00 UTC)
Place
Bagley, MN
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N1831EAeronca 7AC
Defining event
Takeoff-rejected takeoff: Collision during takeoff/land
Weather
Visual (VMC) · Day
Status
Completed · report June 11, 2009
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration - Minneapolis FSDO
FAA report
20090315011199A
Case key
73495

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 delayed aborted takeoff, which resulted in the ski-equipped airplane running aground and striking trees. Contributing to the accident was the slush layer that had formed since the previous landing.

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.

Runway/land/takeoff/taxi surface: snow/slush/ice covered surfaceEnvironmental issues › Physical environment · Effect on equipmentAeronca 7AC: 1 caseAll aircraft: 219 casesProbable cause
Runway/land/takeoff/taxi surface: snow/slush/ice covered surfaceEnvironmental issues › Physical environment · Decision related to conditionAeronca 7AC: 1 caseAll aircraft: 219 casesProbable cause
Action: delayed actionPersonnel issues › Action/decision · PilotAeronca 7AC: 4 casesAll aircraft: 894 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 landed the ski-equipped airplane on the snow-covered frozen lake earlier in the day. After several hours of ice fishing, he taxied the airplane to the east side of the lake for departure. The lake's longest axis (east/west) was approximately 2,000 feet long. The pilot reported that the lake's orientation, terrain gradient, shoreline trees, and prevailing winds favored a departure to the west. During the takeoff run, the airplane accelerated slower than normal due to a slush layer that had formed since the previous landing. The pilot reported that the tail became airborne about halfway across the lake, but he aborted the takeoff when the airplane had not attained flying airspeed after crossing 3/4 of the lake. The airplane was unable to stop before running aground and impacting several trees, substantially damaging the fuselage and both wings.

Factual narrative

The pilot landed the ski-equipped airplane on the snow-covered frozen lake earlier in the day. After several hours of ice fishing, he taxied the airplane to the east side of the lake for departure. The lake's longest axis (east/west) was approximately 2,000 feet long. The pilot reported that the lake's orientation, terrain gradient, shoreline trees, and prevailing winds favored a departure to the west. During the takeoff run, the airplane accelerated slower than normal due to a slush layer that had formed since the previous landing. The pilot reported that the tail became airborne about halfway across the lake, but he aborted the takeoff when the airplane had not attained flying airspeed after crossing 3/4 of the lake. The airplane was unable to stop before running aground and impacting several trees, substantially damaging the fuselage and both wings.

Aircraft

Registration
N1831E
Reported as
Aeronca 7AC
Category
Airplane
Serial number
7AC5399
Airframe hours
2,372
Engine
Teledyne Continental Motors O-200-A, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · October 16, 2008
Departed
Bagley, MN
Destination
96M · Bemidji, MN
Airport
Jackson Lake, runway 27, snow

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
42
Injuries
None
Certificate
Private
Airplane ratings
Single-engine sea, Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
July 16, 2007
Seat
Front
Flight hours
616 total · 573 in this make and model · 564 as pilot in command · 19 in the last 90 days · 9 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
160° at 18 knots, gusting 23
Visibility
10 statute miles
Lowest ceiling
None
Temperature
52 °F, dew point 30 °F
Altimeter
30.00 inHg
Observed at
KFSE, 17 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.