CEN12CA038

NTSB accident investigation · Pipistrel Sinus 912 · Indianapolis, IN · October 16, 2011

Accident · No injuriesData collectionFinal report
Date
October 16, 2011, 14:45 local (18:45 UTC)
Place
Indianapolis, IN
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N9013HPipistrel Sinus 912
Defining event
Landing-landing roll: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report December 27, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA - Indianapolis FSDO
FAA report
20111016024949A
Case key
82124

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 directional control of the motor-glider while landing in gusty wind conditions.

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.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedPipistrel SINUS 912: 1 caseAll aircraft: 3,958 casesProbable cause
Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Response/compensationPipistrel SINUS 912: 1 caseAll 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 reported that the motor-glider encountered a wind gust during the landing flare that resulted in a 15-degree runway misalignment. The pilot considered a go-around, but chose to attempt a landing in the grass adjacent to the runway because he believed that was the safest course of action. He stated that another wind gust "caught" the right wing and the motor-glider ground looped in the grass, nosed over, and sustained substantial damage to the fuselage. The pilot reported that the wind at the time of the accident was gusting to 25 knots. The pilot reported no mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Factual narrative

The pilot reported that the motor-glider encountered a wind gust during the landing flare that resulted in a 15-degree runway misalignment. The pilot considered a go-around, but elected to attempt a landing in the grass adjacent to the runway as the safest course of action. He stated that another wind gust "caught" the right wing and the motor-glider ground looped in the grass. The motor-glider subsequently nosed over and received substantial damage to its fuselage. The pilot reported no mechanical malfunctions or failures. A weather reporting station near the accident airport recorded the wind speed as 15 knots gusting to 25 knots. The reported wind direction was aligned with the runway direction.

Aircraft

Registration
N9013H
Reported as
Pipistrel Sinus 912
Category
Glider
Serial number
088S9120103
Airframe hours
664
Engine
Rotax 912S, 85 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · February 23, 2011
Departed
LOU · Louisville, KY
Destination
MQJ · Indianapolis, IN
Flight plan
Unknown
Airport
MQJ · Indianapolis Regional, runway 25

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
59
Injuries
None
Certificate
Private
Last flight review
December 8, 2010
Seat
Left
Flight hours
531 total · 344 in this make and model · 438 as pilot in command · 18 in the last 90 days · 8 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
250° at 15 knots, gusting 25
Visibility
10 statute miles
Lowest ceiling
15,000 ft broken
Temperature
72 °F, dew point 46 °F
Altimeter
29.76 inHg
Observed at
IND, 19 nm away

Docket · 1

The files NTSB released with the investigation on November 18, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.1 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.