CEN18LA219

NTSB accident investigation · Aston Kinsey Tercel · Cokeville, WY · June 11, 2018

Accident · No injuriesLimited investigationFinal report
Date
June 11, 2018, 07:15 local (13:15 UTC)
Place
Cokeville, WY
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N640BEAston Kinsey Tercel
Defining event
Landing: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report February 5, 2019
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20180611007579A
Case key
97441

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 loss of gyrocopter control for reasons that could not be determined because postaccident examination of the gyrocopter revealed no mechanical malfunctions or failures that would have precluded normal operation.

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.

Not determinedNot determined › Not determined · Unknown/Not determinedAviation Artur Trendak TERCEL: 1 caseAll aircraft: 2,247 casesProbable cause
Performance/control parametersAircraft › Aircraft oper/perf/capability · Not attained/maintainedAviation Artur Trendak TERCEL: 1 caseAll aircraft: 1,269 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 sport pilot reported that, while performing maneuvers in the gyrocopter south of the private airstrip, he felt no response when he applied left cyclic, and the gyrocopter "was stuck in a moderate right turn." The pilot initiated an emergency descent back to the private airstrip. During the approach, the pilot was unable to regain control of the gyrocopter, and it impacted terrain while sliding to the right. The gyrocopter rolled over and came to rest on its right side. Postaccident examination of the gyrocopter revealed no evidence of preimpact mechanical malfunctions or failures that would have precluded normal operation.

Factual narrative

On June 11, 2018, at 0715 mountain daylight time, an Aston Kinsey Tercel gyrocopter, N640BE, impacted terrain during landing at a private airstrip near Cokeville, Wyoming. The sport pilot and passenger were not injured, and the gyrocopter sustained substantial damage. The gyrocopter was registered and operated by a private individual as a Title 14 Code of Federal Regulations Part 91 personal flight. Visual meteorological conditions prevailed at the time of accident, and a flight plan had not been filed. The local flight departed the private airstrip at 0700. According to the pilot, while performing maneuvers south of the private airstrip, he felt no response when he applied left cyclic, and the gyrocopter "was stuck in a moderate right turn." The pilot initiated an emergency descent back to the private airstrip. During the approach, the pilot was unable to regain control of the gyrocopter, and it impacted terrain while sliding to the right. The gyrocopter rolled over to the right and came to rest on its right side. Post accident examination of the gyrocopter by Federal Aviation Administration inspectors revealed the gyrocopter sustained substantial damage to the main rotor blades, fuselage structure, vertical stabilizers, and horizontal stabilizer. A cyclic push/pull tube was fractured consistent with damage sustained during the impact; no additional anomalies were noted with the flight control systems. The examination revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation.

Aircraft

Registration
N640BE
Reported as
Aston Kinsey Tercel (NO SERIES)
Category
Gyroplane
Serial number
T&SG20815S
Built
2015
Airframe hours
130
Engine
Rotax 912UL, 125 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental light sport (Special)
Last inspection
100 hour · September 14, 2017 · 79 hours before
Departed
Cokeville, WY
Destination
Cokeville, WY
Equipment
Unknown

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
42
Injuries
None
Certificate
Sport Pilot
Medical
Sport pilot, Without waivers/limitations
Last flight review
February 17, 2018
Seat
Right
Restraint
3-point
Flight hours
95 total · 90 in this make and model · 77 as pilot in command · 70 in the last 90 days · 35 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
9,500 ft broken
Temperature
32 °F, dew point 28 °F
Altimeter
30.11 inHg
Observed at
AFO, 40 nm away

Docket · 2

The files NTSB released with the investigation on June 21, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.5 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.