ANC91LA152

NTSB accident investigation · Piper PA-18-150 · Anaktuvuk Pass, AK · September 12, 1991

Accident · Serious injuriesLimited investigationFinal report
Date
September 12, 1991, 11:00 local (19:00 UTC)
Place
Anaktuvuk Pass, AK
Injuries
1 serious, 1 minor
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N2515APiper PA-18-150
Weather
Visual (VMC) · Day
Status
Completed · report March 10, 1993
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19910912042829A
Case key
5625

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

That the pilot inadvertently stall/spun the airplane to the ground. Contributing to the accident was the pilot's failure to adequately remove the ice/frost from the wings before starting the takeoff.

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.

Loss of control - in flightTakeoff - initial climb
Stall/spin - inadvertentPilot in commandCause
Ice/frost removal from aircraft - not performedPilot in commandFactor
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The pilot and witnesses reported that just after the airplane took off from a remote mountain strip, the left wing suddenly dropped, and the airplane spun to the ground. The pilot thought that he had possibly not removed all of the frost from the wings after he removed the wing covers. The airplane had been outside overnight. The temperatures had been below freezing, and 2-3 inches of dry snow had fallen.

Aircraft

Registration
N2515A
Reported as
Piper PA-18-150
Category
Airplane
Serial number
18-1972
Airframe hours
4,375
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Business · Part 91
Operator
Holt, Robert N.
Registered owner
Holt, Robert N.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 25, 1991 · 40 hours before
Departed
AKP · Anaktuvuk Pss, AK
Destination
AKP · Anaktuvuk Pass, AK
Flight plan
Company 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
33
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
1,594 total · 1,532 in this make and model · 90 in the last 90 days · 35 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
360° at 5 knots
Visibility
5 statute miles
Lowest ceiling
2,000 ft broken

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 N2515A · 3

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