ANC09CA026

NTSB accident investigation · Cessna 170B · Dillingham, AK · March 26, 2009

Accident · Minor injuriesData collectionFinal report
Date
March 26, 2009, 14:10 local (22:10 UTC)
Place
Dillingham, AK
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N2989DCessna 170B
Defining event
Initial climb: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report July 28, 2009
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA
FAA report
20090326046829A
Case key
73564

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 pilot's selection of unsuitable terrain for takeoff and his failure to attain adequate airspeed to avoid an aerodynamic stall. Contributing to the accident was the pilot's decision to take off with the airplane over its maximum allowable gross weight.

Findings · 4

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.

Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna 170B: 13 casesAll aircraft: 1,681 casesProbable cause
Action: incorrect action selectionPersonnel issues › Action/decision · PilotCessna 170B: 1 caseAll aircraft: 397 casesProbable cause
Aircraft capability: maximum weightAircraft › Aircraft oper/perf/capability · Capability exceededCessna 170B: 1 caseAll aircraft: 152 casesProbable cause
Terrain: snowy/icy terrainEnvironmental issues › Physical environment · Effect on operationCessna 170B: 4 casesAll aircraft: 77 cases

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 private pilot was taking off from a snow-covered area in a ski-equipped airplane for a personal local flight. The pilot said that he took off to the south, but that the snow conditions caused more drag than expected. He said that the airplane cleared the first part of the trees at the end of the takeoff area, but that the wing stalled and the right wing dropped. The airplane then clipped the top of the trees and descended, coming to rest on its right side. The pilot reported no mechanical problems with the airplane, and that he had packed down the takeoff area with a snow machine prior to taking off. He also reported that he aborted a takeoff to the northeast just before the accident takeoff to the south. In a written statement, the pilot reported the maximum gross weight of the airplane as 2200 pounds and its weight at the time of the takeoff as 2600 pounds.

Factual narrative

The private pilot was taking off from a snow-covered area in a ski-equipped airplane for a personal local flight. The pilot said that he took off to the south, but that the snow conditions caused more drag than expected. He said that the airplane cleared the first part of the trees at the end of the takeoff area, but that the wing stalled and the right wing dropped. The airplane then clipped the top of the trees and descended, coming to rest on its right side. The pilot reported no mechanical problems with the airplane, and that he had packed down the takeoff area with a snow machine prior to taking off. He also reported that he aborted a takeoff to the northeast just before the accident takeoff to the south. In a written statement, the pilot reported the maximum gross weight of the airplane as 2200 pounds and its weight at the time of the takeoff as 2600 pounds.

Aircraft

Registration
N2989D
Reported as
Cessna 170B
Category
Airplane
Serial number
26932
Airframe hours
3,486
Engine
Cont Motor O-300 SER, 145 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Fox Brian
Registered owner
Fox Brian
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 3, 2008
Departed
Dillingham, AK
Destination
Dillingham, 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
45
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
November 23, 2008
Seat
Left
Flight hours
243 total · 238 in this make and model · 167 as pilot in command · 13 in the last 90 days · 4 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
170° at 12 knots, gusting 18
Visibility
15 statute miles
Lowest ceiling
9,500 ft broken
Temperature
30 °F, dew point 27 °F
Altimeter
29.30 inHg
Observed at
PADL, 5 nm away

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 N2989D · 1

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