| Tail Number / N-Number | N91HH |
| Manufacturer | SCHLEICHER |
| Model | ASK-21 |
| Year Built | 1990 |
| Manufacturer's Serial Number | 21485 |
| 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 | AMA/EXPR |
| Engine Model | UNKNOWN ENG |
| Number of Engines | 0 engines |
| Type of Registrant | Corporation |
| Owner Name | HARRIS HILL SOARING CORP |
| Street | PO BOX 544 |
| City | HORSEHEADS |
| State | NY |
| Zip Code | 14845-0544 |
| Region | Eastern |
| County | Chemung County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1991-03-21 |
| Certificate Issue Date | 1991-02-07 |
| Last Action Date | 2022-07-14 |
| Expiration Date | 2029-12-31 |
| Status | Valid Registration |
| Mode S Code | 53112411 |
| Mode S Code Hex | AC9509 |