| Tail Number / N-Number | N1820S |
| Manufacturer | BEECH |
| Model | 77 |
| Year Built | 1981 |
| Manufacturer's Serial Number | WA-288 |
| 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 | 0-235 SERIES |
| Engine Type | 4 Cycle |
| Number of Engines | 1 engine |
| Horsepower | 115 hp (86 kW) |
| Type of Registrant | Co-Ownership |
| Owner Name | CLARK ROBERT R |
| Other Names |
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| Street | PO BOX 4038 |
| City | COVINA |
| State | CA |
| Zip Code | 91723-0438 |
| Region | Western-Pacific |
| County | Los Angeles County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1981-12-17 |
| Certificate Issue Date | 1994-05-23 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-05-31 |
| Status | Valid Registration |
| Mode S Code | 50245203 |
| Mode S Code Hex | A14A83 |