ANC14CA018

NTSB accident investigation · Piper PA 18 · Tanana, AK · March 8, 2014

Accident · No injuriesData collectionFinal report
Date
March 8, 2014, 13:00 local (21:00 UTC)
Place
Tanana, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N8281CPiper PA 18
Defining event
Takeoff: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report August 14, 2014
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
20140308002309A
Case key
88909

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 passenger inadvertently interfered with the rudder control pedal, which resulted in a loss of directional control during takeoff.

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: yaw controlAircraft › Aircraft oper/perf/capability · Not specifiedPiper PA-18A: 2 casesAll aircraft: 149 casesProbable cause
Physical workspace: controls and displaysEnvironmental issues › Task environment · Ability to respond/compensatePiper PA-18A: 1 caseAll aircraft: 5 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Attain/maintain not possiblePiper PA-18A: 6 casesAll aircraft: 3,958 casesProbable cause
ActionPersonnel issues › Action/decision · PassengerPiper PA-18A: 1 caseAll aircraft: 111 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 pilot reported that during the takeoff run, just before liftoff from a frozen, snow-covered lake, the ski-equipped airplane bounced over a snow drift. The pilot applied corrective action; however, rudder control inputs were momentarily unresponsive and the airplane's left wing tip contacted the snow covered lake. The pilot regained rudder authority and continued the takeoff. After the airplane became airborne the pilot learned that his rear seat passenger's foot (boot) inadvertently interfered with the rudder control pedal. The pilot continued the flight to his planned destination and landed without further incident. After landing, the pilot noted damage to the left wing, which was later classified as substantial damage. The pilot reported that there were no preaccident mechanical malfunctions or failures that would have precluded normal operation.

Factual narrative

The pilot reported that during the takeoff run, just before liftoff from a frozen, snow-covered lake, the ski-equipped airplane bounced over a snow drift. The pilot applied corrective action; however, rudder control inputs were momentarily unresponsive and the airplane's left wing tip contacted the snow covered lake. The pilot regained rudder authority and continued the takeoff. After the airplane became airborne the pilot learned that his rear seat passenger's foot (boot) inadvertently interfered with the rudder control pedal. The pilot continued the flight to his planned destination and landed without further incident. After landing, the pilot noted damage to the left wing, which was later classified as substantial damage. The pilot reported that there were no preaccident mechanical malfunctions or failures that would have precluded normal operation.

Aircraft

Registration
N8281C
Reported as
Piper PA 18
Category
Airplane
Serial number
18-3689
Built
1954
Airframe hours
5,486
Engine
Lycoming O-290 SERIES, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Kenneth C Thomas
Registered owner
Kenneth C Thomas
Airworthiness certificate
Standard, Normal
Last inspection
Annual · August 25, 2013
Departed
Tanana, AK
Destination
FAI · Fairbanks, 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
48
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
August 11, 2012
Seat
Front
Restraint
3-point
Flight hours
2,000 total · 1,800 in this make and model · 2,000 as pilot in command · 20 in the last 90 days · 16 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
70° at 10 knots, gusting 15
Visibility
30 statute miles
Lowest ceiling
None
Temperature
-6 °F, dew point -9 °F
Altimeter
29.92 inHg

Docket · 3

The files NTSB released with the investigation on August 6, 2014, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.1 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.