ASN Wikibase Occurrence # 225823
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| Date: | Tuesday 4 June 2019 |
| Time: | 16:00 LT |
| Type: | Alisport Silent 2 Electro |
| Owner/operator: | |
| Registration: | N66911 |
| MSN: | 2079 |
| Year of manufacture: | 2016 |
| Total airframe hrs: | 200 hours |
| Engine model: | LZ Design FES |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Danbury, Fairfield County, CT -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Danbury Airport, CT (DXR/KDXR) |
| Danbury Airport, CT (DXR/KDXR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was conducting a personal flight in an electrically-powered, self-launching motor glider. He stated that, while returning to the departure airport at the conclusion of the flight, the glider encountered sink and he turned on the electric motor, but it produced 'no thrust.' The glider continued to descend and impacted a house about 2 miles from the airport, resulting in substantial damage. The pilot reported that there were no mechanical failures or malfunctions with the glider that would have prevented normal operation before the accident and that the accident might have been prevented with 'better management of power and understanding of battery power source.'
Data from the engine control unit indicated that the motor was used for about 13 minutes during the taxi, takeoff, and climb. The motor was used again about 5 hours into the flight for about 19 minutes, and again about 5:49 hours elapsed flight time, for about 32 minutes. The final activation of the motor occurred at 6:21 elapsed flight time; the accident occurred at an elapsed flight time of about 6:22. According to the glider manufacturer, the battery supplied power for takeoff and an additional 40 minutes of use thereafter. During the accident flight, the motor was used for a total of over 1 hour. Given this information, it is likely that the pilot had exhausted the available battery power and that the motor was no longer able to provide sufficient thrust to sustain flight.
Probable Cause: The pilot's inadequate inflight management of the motor glider's available battery power, which resulted in the inability of the electric motor to provide sufficient thrust to sustain flight in an environment where no atmospheric lift was available.
Accident investigation:
 |
|
Sources:
NTSB ERA19LA186
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=66911
Location
Media:
Danbury\'s Mayor Mark Boughton said a glider plane crashed into a home Tuesday evening. https://t.co/XVQpX2vI8Z
— FOX61 (@FOX61News) 5 juin 2019
BREAKING: small plane crashes through roof of house- Danbury, Connecticut. pic.twitter.com/gUMZ0GufkT
— Heidi Hatch (@tvheidihatch) 4 juin 2019
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Jun-2019 23:28 | Geno | Added |
| 04-Jun-2019 23:43 | Geno | Updated [Date] |
| 05-Jun-2019 00:56 | Iceman 29 | Updated [Source, Embed code] |
| 05-Jun-2019 04:01 | Geno | Updated [Aircraft type, Source, Embed code, Narrative] |
| 05-Jun-2019 04:14 | RobertMB | Updated [Aircraft type, Nature, Narrative] |
| 05-Jun-2019 04:23 | RobertMB | Updated [Registration, Cn, Operator, Source] |
| 05-Jun-2019 04:25 | RobertMB | Updated [Operator] |
| 05-Jun-2019 04:28 | RobertMB | Updated [Location, Narrative] |
| 24-Jun-2022 18:36 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Source, Embed code, Narrative, Category, Accident report] |
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