| Tail Number / N-Number | N4121Z |
| Manufacturer | PIPER |
| Model | PA-18 |
| Year Built | 1964 |
| Manufacturer's Serial Number | 18-8165 |
| Aircraft Type | Fixed wing single engine |
| 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 | LYCOMING |
| Engine Model | 0-320 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Average Cruising Speed | 97 miles per hour |
| Type of Registrant | Individual |
| Owner Name | WRITER KATHERINE E |
| Street | PO BOX 440 |
| City | TALKEETNA |
| State | AK |
| Zip Code | 99676-0440 |
| Region | Alaskan |
| County | Matanuska-Susitna Borough |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Restricted |
| Airworthiness Date | 1994-10-03 |
| Certificate Issue Date | 2006-01-03 |
| Last Action Date | 2022-04-24 |
| Expiration Date | 2029-09-30 |
| Status | Valid Registration |
| Mode S Code | 51157041 |
| Mode S Code Hex | A4DE21 |