ANC08LA039

NTSB accident investigation · Piper PA-18-150 · Nikolai, AK · March 4, 2008

Accident · No injuriesLimited investigationFinal report
Date
March 4, 2008, 10:30 local (14:30 UTC)
Place
Nikolai, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N985WPiper PA-18-150
Defining event
Initial climb: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report August 28, 2008
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
Anchorage, FSDO-03
Case key
67622

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 flight instructor's inadequate evaluation of the weather conditions. Contributing to the accident was an inadvertent stall/mush.

Findings · 7

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Wind: downdraftEnvironmental issues › Conditions/weather/phenomena · Not specifiedPiper PA-18-150: 6 casesAll aircraft: 178 casesProbable cause
TurbulenceEnvironmental issues › Conditions/weather/phenomena · Not specifiedPiper PA-18-150: 3 casesAll aircraft: 92 casesProbable cause
Planning/preparation: weather planningPersonnel issues › Task performance · PilotPiper PA-18-150: 5 casesAll aircraft: 156 casesProbable cause
Object/animal/substance: tree(s)Environmental issues › Physical environment · Not specifiedPiper PA-18-150: 19 casesAll aircraft: 933 cases
Object/animal/substance: residence/buildingEnvironmental issues › Physical environment · Not specifiedPiper PA-18-150: 2 casesAll aircraft: 58 cases
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-18-150: 24 casesAll aircraft: 1,681 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The commercial certificated flight instructor was providing wilderness flying instruction to a private certificated student pilot. The student pilot said that he and the instructor were in the lead airplane of a flight of three. He said they were departing from a frozen lake, and that the takeoff area was mostly glare ice. The wind was gusting heavily, and the other two airplanes taxied out first. Both airplanes lost control, and spun into the wind. Since the others were having trouble maintaining directional control, the instructor told him to taxi to the center of the lake. He said he suggested taxiing farther down the lake to give them more takeoff length, but the instructor said no. The student pointed the airplane toward the lowest point in the hills surrounding the lake, and applied takeoff power. When the airplane reached flying speed, he pulled in full flaps as instructed. Approaching the hills they encountered gusts and downdrafts, the climb rate declined, and the instructor took the controls. The student asked if he should reduce the flaps, which were full down, and the instructor said no. The instructor turned the airplane to the left to avoid hitting the lodge. The airplane settled into the trees, and collided with a structure, receiving substantial damage to the wings and fuselage.

Factual narrative

On March 4, 2008, about 1030 Alaska standard time, a ski-equipped Piper PA-18-150 airplane, N985W, sustained substantial damage following a loss of control and impact with trees and a building during takeoff initial climb, about 41 miles southeast of Nikolai, Alaska. The airplane was being operated by Alaska Cub Training Specialist LLC, Palmer, Alaska, as a visual flight rules (VFR) instructional flight under Title 14, CFR Part 91, when the accident occurred. The commercial certificated flight instructor, and the private certificated student pilot, were not injured. Visual meteorological conditions prevailed, and no flight plan was filed. The airplane was departing on a frozen lake.

In a written statement dated March 25, the student pilot wrote that he had contracted with Alaska Cub Training Specialist to provide wilderness flight training, while following the Iditarod sled dog race. He reported that they had not flown for several days due to high winds, and that on the morning of the accident, the wind was still high and gusting. He stated he and his instructor were the lead airplane in a flight of three, and that due to the sun and wind, most of the snow was gone from the lake's surface, and the takeoff area was mostly glare ice. He said the other two airplanes taxied out first, and both lost control, and spun into the wind due to gusting conditions. He said since the other airplanes were having trouble maintaining control while taxiing, his instructor told him to taxi to the center of the lake. He said he suggested taxiing farther down the lake to give them more takeoff length, but the instructor said no. The student said he was on the controls, and pointed the airplane toward the lowest point in the hills surrounding the lake. The lowest point was also the location of the lodge. When he reached flying speed, he pulled in full flaps as instructed, and after becoming airborne, the airplane settled back to the surface, and then began to climb. He said as they approached the hills, the climb rate declined as they encountered gusts and downdrafts. He reported that the instructor took the controls, and as they approached the rising terrain, he asked if he should reduce the flaps, which were full down. The instructor said no, and began a left turn to avoid hitting the lodge. He said the airplane settled into the trees, and collided with the wash house. He stated that the airplane sustained damage to the fuselage and both wings.

Aircraft

Registration
N985W
Reported as
Piper PA-18-150
Category
Airplane
Serial number
18-7609
Engine
Lycoming O-320-A2B, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Alaska Cub Training Specialist LLC, doing business as Alaska Cub Training Specialist
Registered owner
Knik Glacier Air LLC
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 1, 2008
Departed
Nikolia, 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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Flight instructor
Age
23
Injuries
None
Certificates
Flight instructor, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
September 1, 2007
Seat
Rear
Flight hours
1,200 total · 600 in this make and model · 700 as pilot in command · 250 in the last 90 days · 75 in the last 30 days
Role
Student pilot
Age
48
Injuries
None
Certificate
Student
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Last flight review
August 1, 2007
Seat
Front
Flight hours
400 total · 20 in this make and model · 5 in the last 90 days · 5 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
70° at 25 knots, gusting 35
Visibility
10 statute miles
Lowest ceiling
7,000 ft overcast
Temperature
30 °F

Other investigations on N985W · 1

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