- Date
- May 9, 2010, 12:44 local (16:44 UTC)
- Place
- Unionville, PA
- Injuries
- 1 serious
- Damage
- Substantial damage
- Phase of flight
- Maneuvering
- Aircraft
- N6BFSchleicher ASW-20C
- Defining event
- Maneuvering-low-alt flying: Loss of lift
- Weather
- Visual (VMC) · Day
- Status
- Completed · report April 12, 2011
- Report
- Approved by Office Director
- NTSB office
- Eastern Region Aviation
- Parties
- FAA/FSDO
- FAA report
- 20100509034519A
- Case key
- 75983
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The pilot's lack of remedial action in response to a loss of altitude, which led to a forced landing in unsuitable terrain.
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.
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
According to the glider pilot, the flight was intended as a local recreational flight. He planned to climb via thermals to get across a five-mile gap between ridges, but was unable to gain altitude. He then attempted to turn to a "spur" that was separate from the main ridge to gain lift, but while performing the maneuvers the glider continued to lose altitude in a downdraft. The glider subsequently impacted trees and came to rest inverted, seriously injuring the pilot. The pilot reported that there were no mechanical problems with the glider. He stated that, in retrospect, he should have released the 10 gallons of water ballast in each wing and deployed positive flaps. A weather observation taken 35 miles from the accident site, approximately at the time of the accident, recorded the wind from 301 degrees at 13 knots, gusting to 20 knots.
Factual narrative
According to the pilot, this was intended as an “out & return” recreational flight. He intended to climb via thermals to get across a five-mile gap between ridges, but was unable to gain altitude. He then attempted to turn to a “spur” that was separate from the main ridge to gain lift, but while performing the maneuvers, the glider continued to lose altitude “in sinking air.” The glider subsequently impacted trees and came to rest inverted, seriously injuring the pilot. The pilot reported that there were no mechanical problems with the glider. He stated that in retrospect, he should have released the 10 gallons of water ballast in each wing and deployed positive flaps. A weather observation taken approximately at the time of the accident, 35 miles from the accident site, recorded the wind as 290 degrees at 13 knots, gusting 20 knots.
Aircraft
- Registration
- N6BF
- Reported as
- Schleicher ASW-20C
- Category
- Glider
- Serial number
- 20832
- Airframe hours
- 1,000
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Operator
- Dutka Leslie A
- Registered owner
- Dutka Leslie A
- Airworthiness certificate
- Special, Experimental (Special)
- Last inspection
- Annual · April 20, 2010
- Departed
- 79N · Unionville, PA
- Destination
- 79N · Unionville, PA
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
- 66
- Injuries
- Serious
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 3, With waivers/limitations
- Last flight review
- January 23, 2010
- Seat
- Single
- Flight hours
- 2,500 total · 500 in this make and model · 20 in the last 90 days · 4 in the last 30 days
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 290° at 13 knots, gusting 20
- Visibility
- 10 statute miles
- Lowest ceiling
- 4,400 ft overcast
- Temperature
- 43 °F, dew point 28 °F
- Altimeter
- 30.09 inHg
- Observed at
- KUNV, 35 nm away
Docket · 4
The files NTSB released with the investigation on November 17, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.0 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.