| Tail Number / N-Number | N128KS |
| Manufacturer | SCHLEICHER |
| Model | ASK-21 |
| Manufacturer's Serial Number | 21273 |
| 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 | MAH RICHARD |
| Other Names |
|
| Street | 4 PRIMROSE LN |
| City | LOS ALAMOS |
| State | NM |
| Zip Code | 87544-1588 |
| Region | Southwestern |
| County | Los Alamos County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1985-12-28 |
| Certificate Issue Date | 2021-02-25 |
| Last Action Date | 2021-02-25 |
| Expiration Date | 2028-02-29 |
| Status | Valid Registration |
| Mode S Code | 50071134 |
| Mode S Code Hex | A0725C |