| Registration Letters | OY-XSI |
| Manufacturers's serial number | MHL.012 (off: WB985) |
| Year Built | 1950 |
| Registration Date | 1995.10.10 |
| Previous Identities | SE-SMA WB985 |
| Cancelled | 2005.12.12 |
| Fate | G-CKNN BGA-5230/KNN N985WB |
| Notes | G-CKNN cancelled by CAA 2010.06.02. 2019.10.22: N985WB. |
| Last Update | 2023.02.27 |
| Type Designation | Slingsby T-21B Sedbergh |
| Manufacturer | Slingsby Sailplanes |
| CoA | X.S.4 |
| Issued | 1995.10.09 |
| Comp. No. | SI |
| Seq. No. |
| Builder | Martin Hearn Ltd |
| Place | Ellesmere Port, UK |
| COR | S.02860 |
| Issued | 1997.02.20 |
| Cancelled | 2005.12.12 |
| Owner | Henrik Brag Brogaard (+3) |
| Town | Farsø |
| User |
| COR | S.02810 |
| Issued | 1995.10.10 |
| Cancelled | 1997.02.20 |
| Owner | Slingsby-Gruppen |
| Town | Holstebro |
| User |
| COR | MS.024 |
| Issued | 1995.09.12 |
| Cancelled | 1995.10.10 |
| Owner | Slingsby-Gruppen |
| Town | Holstebro |
| User |
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