WPR09CA479

NTSB accident investigation · Schleicher ASK-21 · Jean, NV · June 30, 2009

Accident · Minor injuriesData collectionFinal report
Date
June 30, 2009, 12:15 local (19:15 UTC)
Place
Jean, NV
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N63JJSchleicher ASK-21
Defining event
Initial climb: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report March 3, 2010
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20090630020239A
Case key
74968

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 control of the glider during the initial climb due to an inadvertent encounter with wind.

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.

Turbulence: convective turbulenceEnvironmental issues › Conditions/weather/phenomena · Effect on operationSchleicher ASK-21: 1 caseAll aircraft: 145 cases
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedSchleicher ASK-21: 1 caseAll aircraft: 3,958 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotSchleicher ASK-21: 2 casesAll aircraft: 9,295 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 pilot reported that after climbing to about 50 feet above ground level and reaching an airspeed of about 60 knots "...the glider would not continue to climb and immediately began to descend." The pilot stated that he lowered the nose and released the tow rope to land straight ahead, but immediately upon releasing [the tow rope] the left wing raised and the aircraft drifted right between the two runways. The pilot further stated, "In spite of a full left control stick input the glider continued to roll steeply right, and at the same time [I] had the sensation of being blown sideways and that the tail was being lifted up in an uncontrollable nose-down attitude." The pilot reported that the aircraft struck the ground on the right wing tip first, then the front nosewheel, then the tailwheel. The aircraft sustained substantial damage to the undercarriage and the empennage. The pilot stated that he thought he had encountered a dust devil that was not in view and to the rear of the glider during takeoff. A witness reported that the glider seemed to be "...pushed down, though making forward progress until it turned steeply right." The pilot reported no anomalies with the glider.

Factual narrative

The pilot reported that after climbing to about 50 feet above ground level and reaching an airspeed of about 60 knots "...the glider would not continue to climb and immediately began to descend." The pilot stated that he lowered the nose and released the tow rope to land straight ahead, but immediately upon releasing [the tow rope] the left wing raised and the aircraft drifted right between the two runways. The pilot further stated, "In spite of a full left control stick input the glider continued to roll steeply right, and at the same time [I] had the sensation of being blown sideways and that the tail was being lifted up in an uncontrollable nose-down attitude." The pilot reported that the aircraft struck the ground on the right wing tip first, then the front nose wheel, then the tail wheel. The aircraft sustained substantial damage to the undercarriage and the empennage. The pilot stated that he thought he had encountered a dust devil that was not in view and to the rear of the glider during takeoff. A witness reported that the glider seemed to be "...pushed down, though making forward progress until it turned steeply right." The pilot reported no anomalies with the glider.

Aircraft

Registration
N63JJ
Reported as
Schleicher ASK-21
Category
Glider
Serial number
21248
Airframe hours
4,366
Damage
Substantial damage
Flight
Glider tow · Part 91
Operator
John M Henderson
Registered owner
Aerobatic Force LLC
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 19, 2009
Departed
0L7 · Jean, NV
Destination
0L7 · Jean, NV
Airport
0L7 · Jean Airport, runway 20R, 4,600 × 75 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
54
Injuries
Minor
Certificate
Commercial
Last flight review
October 26, 2008
Seat
Front
Flight hours
4,606 total · 182 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 10 knots, gusting 7
Visibility
10 statute miles
Lowest ceiling
2,000 ft broken
Observed at
LAS, 23 nm away

Docket · 1

The files NTSB released with the investigation on November 17, 2009, on NTSB’s docket system: statements, records, photos and specialists’ reports. 499 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.