ANC14CA047

NTSB accident investigation · Piper PA 18 · Cantwell, AK · June 25, 2014

Accident · No injuriesData collectionFinal report
Date
June 25, 2014, 10:30 local (18:30 UTC)
Place
Cantwell, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N72842Piper PA 18
Defining event
Takeoff: Turbulence encounter
Weather
Visual (VMC) · Day
Status
Completed · report January 22, 2015
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FSDO - 03
FAA report
20140625010419A
Case key
89554

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 pilot's encounter with a wind gust during takeoff from a short gravel bar, which resulted in the airplane settling after rotation and striking obstacles.

Findings · 2

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.

Personnel issuesPersonnel issues › Task performance · PilotAll aircraft: 137 casesProbable cause
Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Contributed to outcomeAll aircraft: 1,199 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 pilot was taking off from a gravel bar in a tailwheel-equipped airplane with a load of light, bulky cargo items. The gravel bar was in a valley location surrounded by mountainous terrain. He said that the wind indicators along the strip favored the takeoff direction, which was the same direction he had used for landing earlier. He stated that all felt normal during the takeoff roll, but the airplane encountered "a gust from behind or above" upon rotation. The airplane subsequently settled back to the surface and struck brush near the end of strip, turned, and came to a stop across a small ditch. The airplane sustained substantial damage to the right wing and the aft section of the fuselage. The pilot stated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation. The pilot reported that, right after the accident, he observed that the wind became very gusty to about 20 mph. He noted that the wind condition returned to light and variable in less than an hour.

Factual narrative

The pilot was taking off from a gravel bar in a tailwheel-equipped airplane with a load of light, bulky cargo items. The gravel bar was in a valley location surrounded by mountainous terrain. He said that the wind indicators along the strip favored the takeoff direction, which was the same direction he had used for landing earlier. He stated that all felt normal during the takeoff roll, but the airplane encountered "a gust from behind or above" upon rotation. The airplane subsequently settled back to the surface and struck brush near the end of strip, turned, and came to a stop across a small ditch. The airplane sustained substantial damage to the right wing and the aft section of the fuselage. The pilot stated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation. The pilot reported that, right after the accident, he observed that the wind became very gusty to about 20 mph. He noted that the wind condition returned to light and variable in less than an hour.

Aircraft

Registration
N72842
Reported as
Piper PA 18
Category
Airplane
Serial number
18-192
Built
1950
Airframe hours
6,481
Engine
Lycoming O-320 A2B, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Sluice Box Inc, doing business as Gracious House Flying Service
Registered owner
Gratias-Rhoades Living Trust
Airworthiness certificate
Standard, Normal
Last inspection
Annual · August 20, 2013
Departed
Cantwell, AK
Destination
Cantwell, AK
Flight plan
Company VFR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
70
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
August 15, 2013
Seat
Front
Restraint
4-point
Flight hours
8,115 total · 7,000 in this make and model · 8,115 as pilot in command · 0.5 in the last 90 days · 0.5 in the last 30 days · 0.5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
3 statute miles
Lowest ceiling
1,500 ft overcast
Temperature
52 °F, dew point 52 °F
Altimeter
29.64 inHg
Observed at
PABI, 44 nm away

Docket · 1

The files NTSB released with the investigation on January 8, 2015, on NTSB’s docket system: statements, records, photos and specialists’ reports. 789 KB 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.