CEN17LA182

NTSB accident investigation · Pipistrel Doo Ajdovscina Virus SW · Weatherford, TX · May 13, 2017

Accident · Serious injuriesLimited investigationFinal report
Date
May 13, 2017, 18:20 local (23:20 UTC)
Place
Weatherford, TX
Injuries
2 serious
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N616NGPipistrel Doo Ajdovscina Virus SW
Defining event
Takeoff: Aerodynamic stall/spin
Weather
Visual (VMC) · Day
Status
Completed · report June 5, 2018
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA
FAA report
20170513009689A
Case key
95171

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 obtain adequate airspeed during takeoff, which resulted in an aerodynamic stall/spin.

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.

Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Capability exceededPipistrel Doo Ajdovscina VIRUS SW: 1 caseAll aircraft: 990 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedPipistrel Doo Ajdovscina VIRUS SW: 2 casesAll aircraft: 1,681 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 private pilot reported that, during departure for the planned local flight in a motorized glider, just as the nosewheel lifted off, a wind gust from the left pushed the motorized glider to the right. The pilot pulled back on the control stick to climb and simultaneously applied left rudder and aileron. The pilot added that the motorized glider became airborne, but the airspeed was insufficient, and it then entered a "stalled left spin." An automated weather reporting facility located 7 nautical miles south of the accident site recorded that the wind was from 160°at 4 knots. The accident is consistent with the pilot failing to obtain adequate airspeed at takeoff, which resulted in the motorized glider entering an aerodynamic stall/spin immediately after takeoff.

Factual narrative

On May 13, 2017, about 1820 central standard time, a Pipistrel Virus SW motorized-glider, N616NG, impacted terrain while departing the Driftwood Ranch Airport (XA86), Weatherford, Texas. The pilot and passenger were seriously injured. The motorized-glider was registered to and operated by a private individual under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan. The local flight was departing at the time of the accident.According to a statement provided by the pilot, he was departing on runway 16, at XA86. After reaching rotation speed, the pilot rotated the motorized-glider and the nosewheel lifted off when a gust of wind from the left, pushed the motorized-glider to the right. The pilot added that he pulled back on the control stick to climb, and simultaneously added left rudder and aileron. As the motorized-glider got airborne, the pilot reported that the airspeed was insufficient, and the motorized-glider entered a stall-spin. After a quarter turn, the motorized-glider impacted terrain. The collision resulted in substantial damage to the glider's fuselage and wings. At 1815, an automated weather reporting facility located 7 nautical miles south of the accident site recorded a wind from 160 degrees at 4 knots.

Aircraft

Registration
N616NG
Reported as
Pipistrel Doo Ajdovscina Virus SW (NO SERIES)
Category
Glider
Serial number
742SWN100
Built
2015
Engine
Rotax 912ULS, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Departed
XA86 · Weatherford, TX
Destination
XA86 · Weatherford, TX
Airport
XA86 · Driftwood Ranch, runway 16, 2,975 × 40 ft, asphalt

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
47
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, Without waivers/limitations
Seat
Left
Flight hours
780 total · 231 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
160° at 4 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
84 °F, dew point 48 °F
Altimeter
29.88 inHg
Observed at
KGDJ, 7 nm away

Docket · 1

The files NTSB released with the investigation on March 15, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 176 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.