ASN Wikibase Occurrence # 273831
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Thursday 6 January 2022 |
| Time: | 15:35 LT |
| Type: |  Schleicher ASK-16 |
| Owner/operator: | Segel- und Motorfluggruppe Grenchen |
| Registration: | HB-2033 |
| MSN: | 16026 |
| Year of manufacture: | 1974 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Obersee, SZ -
 Switzerland
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Wangen-Lachen Airfield (LSPV) |
| Grenchen Airport (ZHI/LSZG) | |
| Investigating agency: | STSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The motor glider lost power during takeoff from Wangen-Lachen Airfield (LSPV) shortly after takeoff. The aircraft sank and came to rest in the water of the Obersee lake.
The pilot was not injured.
Analysis and Conclusion:
The ground roll until reaching a groundspeed of 70 km/h was approximately 200 m, which is expected according to the takeoff distance calculation. Up to this point, there was no deterioration in the takeoff performance, such as carburetor icing. However, the takeoff performance significantly deteriorated afterward: the powered glider only lifted off after an additional 180 m at a groundspeed of 83 km/h and did not gain any further speed, remaining a few meters above the ground within the ground effect.
The pilot did not perceive any unusual engine sounds and did not change the throttle position until touchdown on the water. Therefore, it is highly likely that the deterioration in takeoff performance after reaching 70 km/h cannot be attributed to a technical cause. Due to the characteristics of the wing profile, it is expected that residual moisture on the wings increased the required takeoff speed beyond the specified 70 km/h for a normal takeoff, impairing the takeoff performance.
Accident investigation:
 |
|
Sources:
https://march24.ch/articles/106292-flugzeug-stuerzt-in-den-obersee
https://www.bote.ch/nachrichten/schwyz/schwyz_bdu/sportflugzeug-landet-im-see;art146989,1368295
https://telebasel.ch/2022/01/06/sportflugzeug-stuerzt-in-den-schwyzer-obersee/?channel=105105
https://www.sust.admin.ch/inhalte/AV-berichte/HB-2033.pdf
https://cdn.jetphotos.com/full/5/22392_1474917499.jpg (photo)
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 06-Jan-2022 16:08 | gerard57 | Added |
| 06-Jan-2022 16:52 | harro | Updated [Aircraft type, Registration, Cn, Source, Plane category] |
| 06-Jan-2022 16:58 | harro | Updated [Operator, Source, Embed code, Narrative, Category] |
| 06-Jan-2022 20:18 | gerard57 | Updated [Total occupants] |
| 06-Jan-2022 21:14 | RobertMB | Updated [Time, Operator, Location, Departure airport, Source, Narrative] |
| 09-Jan-2022 15:49 | Captain Adam | Updated [Narrative] |
| 17-Feb-2022 19:35 | harro | Updated [Time, Destination airport, Source, Damage, Narrative] |
| 13-Jun-2023 16:11 | harro | Updated [[Time, Destination airport, Source, Damage, Narrative]] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation