| Tail Number / N-Number | N521CP |
| Manufacturer | SCHLEICHER |
| Model | ASK-21 |
| Year Built | 1999 |
| Manufacturer's Serial Number | 21694 |
| 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 | CIVIL AIR PATROL INC |
| Street | 105 S HANSELL ST |
| City | MAXWELL AFB |
| State | AL |
| Zip Code | 36112 |
| Region | Southern |
| County | Montgomery County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1999-08-25 |
| Certificate Issue Date | 1999-08-17 |
| Last Action Date | 2020-08-27 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 51506345 |
| Mode S Code Hex | A68CE5 |