ANC97LA021

NTSB accident investigation · Hefty Polar CUB · Anchorage, AK · January 15, 1997

Accident · No injuriesLimited investigationFinal report
Date
January 15, 1997, 15:00 local (19:00 UTC)
Place
Anchorage, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N62905Hefty Polar CUB
Weather
Visual (VMC) · Day
Status
Completed · report May 21, 1998
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19970115001219A
Case key
2961

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.

failure of the pilot to maintain sufficient altitude/clearance from a snow berm during the landing. The snow berm and flat light conditions were related factors.

Analysis

The pilot and a passenger were landing on a frozen lake at the conclusion of a cross-country flight. The pilot reported that overcast clouds and flat lighting conditions prevented him from seeing an approximate 3 feet high snow berm at the approach end of the landing area. The berm resulted from snow plowing operations to create an ice skating area on the lake. During the landing flare, the landing gear skis struck the top of the berm. The airplane came to rest on the ice and received damage to the landing gear and right wing lift strut.

Factual narrative

On January 15, 1997, about 1500 Alaska standard time, a ski equipped experimental homebuilt, Curt Hefty, Polar Cub, N62905, crashed during landing on a frozen lake in Anchorage, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country personal flight when the accident occurred. The airplane, registered to and operated by the pilot, sustained substantial damage. The certificated private pilot and the sole passenger were not injured. Visual meteorological conditions prevailed. The flight originated from Big Lake, Alaska, about 1430.

In a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on January 16, 1997, at 0835, the pilot reported he was landing toward the south on Jewel Lake. Overcast clouds and flat lighting conditions prevented him from seeing about a 3 feet high snow berm at the approach end of the landing area. The berm resulted from snow plowing operations to create an ice skating area on the lake. During the landing flare, the landing gear skis struck the top of the berm. The airplane came to rest on the ice and received damage to the landing gear and right wing lift strut.

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/waterLanding - flare/touchdown
Light condition - otherFactor
Terrain condition - bermFactor
Altitude/clearance - not maintainedPilot in commandCause

Aircraft

Registration
N62905
Reported as
Hefty Polar CUB
Category
Airplane, amateur-built
Serial number
0001
Engine
Continental C-90-F, 90 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
James C. Hefty
Airworthiness certificate
Special, Experimental (Special)
Departed
Big Lake, 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
56
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
2,000 total · 1,500 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
30 statute miles
Lowest ceiling
5,000 ft overcast
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 N62905 · 1

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