WPR13CA412

NTSB accident investigation · Piper PA 11 · Bozeman, MT · September 16, 2013

Accident · Minor injuriesData collectionFinal report
Date
September 16, 2013, 14:20 local (20:20 UTC)
Place
Bozeman, MT
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Taxi
Aircraft
N4988MPiper PA 11
Defining event
Taxi: Roll over
Weather
Visual (VMC) · Day
Status
Completed · report November 19, 2013
Report
Approved by Office Director
NTSB office
Western Pacific Region
FAA report
20130916018899A
Case key
88059

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 failure to maintain aircraft control and inadequate compensation for the high gusty wind conditions during taxi.

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-11: 11 casesAll aircraft: 9,295 casesProbable cause
Performance/control parametersAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-11: 1 caseAll aircraft: 1,269 casesProbable cause
Wind: high windEnvironmental issues › Conditions/weather/phenomena · Not specifiedPiper PA-11: 1 caseAll aircraft: 112 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 reported that after aborting the takeoff due to an approaching thunderstorm and high wind, while taxiing back to the parking area, a strong wind lifted the airplane. The airplane subsequently nosed over which resulted in substantial damage to the wings, fuselage, vertical stabilizer, and rudder. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Factual narrative

The pilot reported that after aborting the takeoff due to an approaching thunderstorm and high winds, while taxiing back to the parking area, a strong wind lifted the airplane. The airplane subsequently nosed over which resulted in substantial damage to the wings, fuselage, vertical stabilizer, and rudder. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N4988M
Reported as
Piper PA 11 (NO SERIES)
Category
Airplane
Serial number
11-476
Built
1948
Engine
Cont Motor C90 SERIES, 90 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Departed
KBZN · Bozeman, MT
Destination
KBZN · Bozeman, MT
Airport
KBZN · Bozeman Yellowstone Internatio

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
67
Injuries
Minor
Certificates
Flight instructor, Commercial, Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 2, With waivers/limitations
Seat
Right
Flight hours
28,000 total
Role
Student pilot
Age
73
Injuries
None
Certificate
Student
Seat
Left

Weather

Conditions
Visual (VMC) · Day
Wind
230° at 27 knots, gusting 42
Visibility
6 statute miles
Lowest ceiling
9,500 ft broken
Temperature
73 °F, dew point 46 °F
Altimeter
29.93 inHg
Observed at
KBZN

Docket · 2

The files NTSB released with the investigation on November 8, 2013, on NTSB’s docket system: statements, records, photos and specialists’ reports. 774 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.