| Tail Number / N-Number | N129KS |
| Manufacturer | SCHLEICHER |
| Model | ASK-21 |
| Manufacturer's Serial Number | 21275 |
| Aircraft Type | Glider |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | NONE |
| Engine Model | NONE |
| Number of Engines | 0 engines |
| Type of Registrant | Corporation |
| Owner Name | HIGH DESERT SOARING CLUB INC |
| Street | PO BOX 8486 |
| City | BEND |
| State | OR |
| Zip Code | 97708-8486 |
| Region | Northwest Mountain |
| County | Deschutes County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1985-12-28 |
| Certificate Issue Date | 2004-01-14 |
| Last Action Date | 2022-09-16 |
| Expiration Date | 2030-01-31 |
| Status | Valid Registration |
| Mode S Code | 50073023 |
| Mode S Code Hex | A07613 |