| Tail Number / N-Number | N421SL |
| Manufacturer | SCHLEICHER |
| Model | ASK-21 |
| Year Built | 2006 |
| Manufacturer's Serial Number | 21808 |
| 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 | Co-Ownership |
| Owner Name | SKYLARK NORTH |
| Other Names |
|
| Street | PO BOX 100 |
| City | TEHACHAPI |
| State | CA |
| Zip Code | 93581-0100 |
| Region | Western-Pacific |
| County | Kern County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2006-03-30 |
| Certificate Issue Date | 2017-11-14 |
| Last Action Date | 2020-07-13 |
| Expiration Date | 2027-11-30 |
| Status | Valid Registration |
| Mode S Code | 51200361 |
| Mode S Code Hex | A500F1 |