GENERAL INFORMATION FOR NTSB REPORT: ANC00LA089
Data Source NTSB AVIATION ACCIDENT/INCIDENT DATABASE
NTSB Report Nbr ANC00LA089
Event Id 20001212X21356
Local Date 07/14/2000
Local Time 1930
State AK
Airport Name WASILLA LAKE
Event Type ACCIDENT
Injury Severity MINOR
Record Status
Mid Air Collision NO
Event Location ON AIRPORT/AIRSTRIP

WEATHER INFORMATION
Weather Briefing Complete NOT PERTINENT
Basic Weather Conditions VISUAL METEOROLOGICAL COND
Light Condition DAY
Cloud Condition UNKNOWN
Cloud Height above Ground Level (ft) 0
Ceiling Height above Ground Level (ft) 5000
Cloud Type OVERCAST
Visibility RVR (ft) 0
Visibility RVV (sm) 0
Visibility (sm) 10
Wind Direction (deg) 360
Wind Condition Flag U
Wind Speed (knots) 10
Wind Condition Indicated Unknown

AIRCRAFT INFORMATION
Aircraft 1
Type of Operation PART 91: GENERAL AVIATION
Registration Number N9359E
Aircraft Make AERONCA
Aircraft Model 11BC
Aircraft Series NO SERIES EXISTS
Aircraft Damage SUBSTANTIAL
Aircraft Fire NONE
Aircraft Explosion NONE
Aircraft Type AIRPLANE
Aircraft Homebuilt UNKNOWN
Phase of Flight TAKEOFF
Aircraft Use PERSONAL
Flight Plan Filed NONE
Operator Name
Operator Doing Business As
Owner Name DEAN P. EISBERG
Number of Seats 2
Number of Engines 1
ELT Installed YES
ELT Operated YES
Departure Airport Id
Departure City FIRE LAKE
Departure State ALASKA
Last Departure Point NO
Destination Airport Id
Destination City THREE MILE LAKE
Destination State ALASKA
Runway Id 28
Runway Length 6000
Runway Width 0
Air Carrier Operating Certificates NO
Air Carrier Other Operating Certificates UNKNOWN
Rotocraft/Agriculture Operating Certificate UNKNOWN
Cert Max Gross Wgt 1350

ENGINE INFORMATION

Aircraft 1 - Engine : #1
Engine Manufactuer Continental
Engine Model C-85
Engine Horsepower 85
Engine Thrust HP
Carb/Injection CARBURETOR

INJURY INFORMATION
Injury Summary for Aircraft 1
Fatal Serious Minor None
Crew 0 0 0 0
Pass 0 0 0 0
Total 0 0 1 0
Sequence of Events for Aircraft 1
Occurrence #1
LOSS OF ENGINE POWER (PARTIAL) - NON-MECHANICAL
Phase of Operation: TAKEOFF - INITIAL CLIMB

Events Sequence for Occurrence #1 of Aircraft 1
Event Seq # Event Group Code Subject Modifier Personnel Cause/Factor
1 1 WEATHER CONDITION CARBURETOR ICING CONDITIONS FACTOR
2 2 CARBURETOR HEAT NOT USED PILOT IN COMMAND CAUSE

Occurrence #2
LOSS OF CONTROL - IN FLIGHT
Phase of Operation: TAKEOFF - INITIAL CLIMB

Events Sequence for Occurrence #2 of Aircraft 1
Event Seq # Event Group Code Subject Modifier Personnel Cause/Factor
3 2 STALL INADVERTENT PILOT IN COMMAND CAUSE

Occurrence #3
IN FLIGHT COLLISION WITH TERRAIN/WATER
Phase of Operation: DESCENT - UNCONTROLLED

Events Sequence for Occurrence #3 of Aircraft 1
Event Seq # Event Group Code Subject Modifier Personnel Cause/Factor
4 1 TERRAIN CONDITION WATER




AIRCRAFT 1 PRELIMINARY REPORT


On July 14, 2000, about 1930 Alaska daylight time, a float equipped Aeronca 11BC airplane, N9359E, sustained substantial damage to the left wing during a takeoff from Three Mile Lake, about 12 miles south of Wasilla, Alaska, at 61 degrees, 28 minutes north latitude, 149 degrees, 45 minutes west longitude. The personal flight was being conducted under Title 14, CFR Part 91, when the accident occurred. The solo airline transport pilot received minor injuries. Visual meteorological conditions prevailed, and no flight plan was filed. The flight originated from Fire Lake, Chugiak, Alaska, about 1900. During a telephone conversation with the National Transportation Safety Board investigator-in-charge on July 14, witnesses reported the airplane had performed two landings prior to the accident. The witnesses described the airplane departing a third time, climbing just above the level of the trees, "doing a u-turn, and dropping straight down into the lake." The witnesses said they heard engine noise until the impact. During a telephone conversation with the National Transportation Safety Board investigator-in-charge on July 17, the pilot said he took off on the long axis of the lake with a right crosswind. He said he turned the airplane left, the airplane's nose dropped, and the airplane impacted the water in a nose low, upright, attitude. The pilot wrote in NTSB Pilot/Operator Accident Report that the engine had a partial power loss, which may have been attributable to carburetor icing. He also stated there were no preaccident mechanical anomalies with the airplane, and that he did not use carburetor heat. The ambient air temperature at the time of the accident was 56 degrees Fahrenheit; the dew point was 45 degrees Fahrenheit.

AIRCRAFT 1 FINAL REPORT


The pilot reported he took off on the long axis of the lake with a right crosswind. As he turned to the left, the airplane descended rapidly and struck the water in a nose low, upright, attitude. Witnesses reported the seaplane had performed two landings prior to the accident. They described the airplane departing a third time, climbing just above the level of the trees, doing a 'u-turn,' and dropping into the lake. They said they heard engine noise until impact. The pilot stated there were no preaccident mechanical anomalies with the airplane, but he did note a partial loss of engine power, which he indicated might have been caused by carburetor icing. He stated he did not use carburetor heat. The ambient air temperature was 56 degrees Fahrenheit, and the dew point was 45 degrees Fahrenheit.

AIRCRAFT 1 CAUSE REPORT


A loss of engine power due to the pilot's failure to use carburetor heat, and an inadvertent stall. A factor associated with the accident was the existence of carburetor icing conditions.


END REPORT