GAA19CA202

NTSB accident investigation · Piper PA 12 · Sisters, OR · April 10, 2019

Accident · Minor injuriesData collectionFinal report
Date
April 10, 2019, 10:30 local (17:30 UTC)
Place
Sisters, OR
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N92798Piper PA 12
Defining event
Landing-landing roll: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report November 6, 2019
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20190410006379A
Case key
99238

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 failure to maintain pitch control during the landing roll, which resulted in a nose-over.

Findings · 3

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-12: 51 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: pitch controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-12: 3 casesAll aircraft: 526 casesProbable cause
Wind: sudden wind shiftEnvironmental issues › Conditions/weather/phenomena · Contributed to outcomePiper PA-12: 5 casesAll aircraft: 114 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 in the tailwheel-equipped airplane reported that, during the approach, the wind speed increased and became turbulent. He recalled that, during the landing roll, "I immediately applied a slight amount of forward stick," but when the tailwheel contacted the surface, "the wind suddenly changed to a tailwind," and the airplane nosed over. The airplane sustained substantial damage to the rudder, both wing lift struts, and the engine mounts. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. The nearest METAR, located at an airport 1 mile away from the accident site, reported that, about the time of the accident, the wind was from 290° at 10 knots, visibility was 10 statute miles, and the clouds were broken at 6,500 ft mean sea level and deteriorating. The pilot landed the airplane on runway 20.

Factual narrative

The pilot in the tailwheel-equipped airplane reported that during the approach, the wind velocity increased and became turbulent. He recalled that during the landing roll, "I immediately applied a slight amount of forward stick," but when the tailwheel contacted the surface, "the wind suddenly changed to a tailwind," and the airplane nosed over. The airplane sustained substantial damage to the rudder, both wing lift struts, and the engine mounts. The nearest METAR was located at an airport 1 mile away from the accident site, and reported that about the time of the accident, the wind was from 290° at 10 knots. The visibility was 10 statute miles, and the clouds were broken at 6,500ft MSL and deteriorating. The pilot landed the airplane on runway 20. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N92798
Reported as
Piper PA 12 (No Series)
Category
Airplane
Serial number
12-244
Built
1946
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Tailwheel Productions Llc
Registered owner
Tailwheel Productions Llc
Airworthiness certificate
Standard, Other
Departed
S33 · Madras, OR
Destination
65K · Sisters, OR
Airport
6K5 · Sisters Eagle Air, runway 20, 3,560 × 60 ft, grass/turf
Equipment
ADS-B, Handheld GPS

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
Pilot
Age
73
Injuries
None
Certificates
Commercial, Flight instructor
Airplane ratings
Single-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
November 28, 2018
Seat
Rear
Flight hours
8,000 total · 100 in this make and model
Role
Student pilot
Age
88
Injuries
Minor
Certificates
Airline transport, Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
With waivers/limitations
Last flight review
April 17, 2017
Seat
Front
Restraint
3-point

Weather

Conditions
Visual (VMC) · Day
Wind
290° at 10 knots
Visibility
10 statute miles
Lowest ceiling
5,500 ft broken
Temperature
50 °F, dew point 41 °F
Altimeter
30.42 inHg
Observed at
KPDX, 1 nm away

Docket · 2

The files NTSB released with the investigation on July 15, 2019, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.4 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.