ANC96LA127

NTSB accident investigation · Cessna 170B · Cantwell, AK · August 18, 1996

Accident · No injuriesLimited investigationFinal report
Date
August 17, 1996, 20:30 local (Aug 18, 1996, 04:30 UTC)
Place
Cantwell, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N3546CCessna 170B
Weather
Visual (VMC) · Day
Status
Completed · report August 29, 1997
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19960817023229A
Case key
2883

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

A failure of the pilot to provide sufficient takeoff distance from the edge of the departure lake and his premature liftoff.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight collision with terrain/waterTakeoff - roll/run
Terrain condition - tundra
Distance/speed - misjudgedPilot in commandCause
Lift-off - prematurePilot in commandCause
Nose overTakeoff - roll/run

Analysis

The certificated private pilot was departing a remote lake. National park rangers observed the airplane collide with tundra at the north end of the lake as the airplane was just taking off. In a written statement to the park rangers, the pilot indicated that he taxied onto the lake and began his takeoff toward the north. He reported that he did not allow sufficient takeoff distance and the airplane descended into the tundra.

Factual narrative

On August 17, 1996, about 2030 Alaska daylight time, a float equipped Cessna 170B, N3546C, collided with terrain during takeoff from a remote lake, about 53 miles west of Cantwell, Alaska. The airplane was being operated as a visual flight rules (VFR) local area personal flight when the accident occurred. The airplane, registered to and operated by the pilot, sustained substantial damage. The certificated private pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed.

A Denali National Park Ranger reported that the pilot was departing Wonder Lake. The airplane was observed to collide with the tundra at the north end of the lake as the airplane was just taking off. In a written statement to the park rangers, the pilot indicated that he taxied onto the lake and began his takeoff toward the north. He reported that he did not allow sufficient takeoff distance and the airplane descended into the tundra.

Aircraft

Registration
N3546C
Reported as
Cessna 170B
Category
Airplane
Serial number
26589
Airframe hours
7,195
Engine
Lycoming O-360-A1A, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Gary Wallace
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 12, 1996 · 28 hours before

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
61
Certificate
Private
Airplane ratings
Single-engine sea, Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
1,815 total · 1,639 in this make and model · 1,770 as pilot in command · 25 in the last 90 days · 2 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Visibility
50 statute miles
Lowest ceiling
None
Temperature
64 °F

FAA reports on this event · 1

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