ANC00LA031

NTSB accident investigation · Cessna 170B · Big Lake, AK · March 5, 2000

Accident · No injuriesLimited investigationFinal report
Date
March 5, 2000, 16:20 local (20:20 UTC)
Place
Big Lake, AK
Injuries
3 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N2814CCessna 170B
Weather
Visual (VMC) · Day
Status
Completed · report May 9, 2001
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
20000305041999A
Case key
48740

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 selection of unsuitable terrain for takeoff. Factors in the accident were soft, snow-covered terrain, and an inadvertent ground loop.

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.

On ground/water encounter with terrain/waterTakeoff - roll/run
Terrain condition - snow coveredFactor
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
Terrain condition - softFactor
Loss of control - on ground/waterTakeoff - roll/run
Ground loop/swerve - inadvertentPilot in commandFactor
Nose downTakeoff - roll/run

Analysis

The private certificated pilot was departing a remote, snow-covered area in a ski equipped airplane. During the takeoff run, the pilot said he noticed sloping terrain in front of the airplane that angled sharply to the left. To avoid the drop off, he applied right rudder, and turned about 10 degrees to the right. He then applied left rudder to stop the turn, but the left ski dug into soft snow. The airplane ground looped to the left, and then nosed down in the snow. The airplane received damage to the landing gear, both wings, and the left horizontal stabilizer. The pilot said the wind conditions were calm.

Factual narrative

On March 5, 2000, about 1620 Alaska standard time, a ski-equipped Cessna 170B airplane, N2814C, sustained substantial damage during takeoff from a remote, snow-covered area, about 20 miles west of Big Lake, Alaska, about latitude 61 degrees, 34 minutes north, and longitude 150 degrees, 29 minutes west. The airplane was being operated as a visual flight rules (VFR) cross-country personal flight to Anchorage, Alaska, when the accident occurred. The airplane was operated by the pilot. The private certificated pilot, and the two passengers, were not injured. Visual meteorological conditions prevailed.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on March 6, 2000, the pilot reported he was taking off toward the east. During the takeoff run, the pilot said he noticed sloping terrain in front of the airplane that angled sharply to the left. To avoid the drop off, he applied right rudder, and turned about 10 degrees to the right. He then applied left rudder to stop the turn, but the left ski dug into soft snow. The airplane ground looped to the left, and then nosed down in the snow. The airplane received damage to the landing gear, both wings, and the left horizontal stabilizer. The pilot said the wind conditions were calm.

Aircraft

Registration
N2814C
Reported as
Cessna 170B
Category
Airplane
Serial number
26357
Engine
Lycoming O-320-A1A, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Robert D. Stone
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 30, 1999
Destination
PANC · Anchorage, AK

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
31
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
225 total · 150 in this make and model · 20 in the last 90 days · 15 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
20 statute miles
Lowest ceiling
None
Temperature
30 °F

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 N2814C · 1

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