ANC98LA034

NTSB accident investigation · Cessna 185F · Coldfoot, AK · April 3, 1998

Accident · No injuriesLimited investigationFinal report
Date
April 3, 1998, 19:00 local (23:00 UTC)
Place
Coldfoot, AK
Injuries
3 uninjured
Damage
Substantial damage
Phase of flight
Taxi
Aircraft
N1205FCessna 185F
Weather
Visual (VMC) · Day
Status
Completed · report February 15, 2001
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19980403005449A
Case key
3127

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 NTSB’s determination of the probable cause, and any contributing factors.

The pilot's selection of unsuitable terrain for takeoff. Soft, snow covered terrain was a factor in the accident.

Analysis

The pilot, and two passengers, were taxiing for takeoff in a wheel/ski equipped, tailwheel airplane. The flight was a VFR air taxi flight from a remote lake. The landing/departure area was about 3,500 feet long, and covered by soft snow. As the pilot began to taxi, he noticed the snow was softer than anticipated, so he began several taxi runs to pack down the snow for takeoff. During a turn, the right ski encountered soft snow and sank. The right wing struck the snow, and the airplane nosed over. The airplane received damage to the right wing, and propeller.

Factual narrative

On April 3, 1998, about 1900 Alaska standard time, a wheel/ski equipped Cessna 185F airplane, N1205F, sustained substantial damage while taxiing for a takeoff from a remote lake, about 50 miles northeast of Coldfoot, Alaska. The airplane was being operated as a visual flight rules (VFR) on-demand passenger flight under Title 14 CFR Part 135 when the accident occurred. The airplane was registered to the pilot, and operated by North Quest Aviation, North Pole, Alaska. The certificated commercial pilot, and the two passengers were not injured. Visual meteorological conditions prevailed. A VFR flight plan was filed.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on April 6, 1998, at 1050, the pilot reported he landed at Squaw Lake about 1830. The landing/departure area was about 3,500 feet long. He loaded his passengers and began to taxi for takeoff from a mining camp. The snow was softer than anticipated, so the pilot began several taxi runs to pack down the snow for takeoff. During a turn, the right ski encountered soft snow and sank. The right wing struck the snow, and the airplane nosed over. The airplane received damage to the right wing, and propeller.

Company personnel reported the flight was overdue, and a search was initiated. Search personnel located the accident site on 4/4/98.

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/waterTaxi
Terrain condition - snow coveredFactor
Terrain condition - softFactor
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
Nose overTaxi

Aircraft

Registration
N1205F
Reported as
Cessna 185F
Category
Airplane
Serial number
185-02768
Airframe hours
3,679
Engine
Continental IO-520-D, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
North Quest Aviation
Registered owner
William E. Anker
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 18, 1998 · 29 hours before
Destination
WCR · Chandalar Lake, AK
Flight plan
VFR

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
32
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
971 total · 146 in this make and model · 900 as pilot in command · 138 in the last 90 days · 29 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 5 knots
Visibility
50 statute miles
Lowest ceiling
None
Temperature
50 °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 N1205F · 1

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