| Tail Number / N-Number | N401SJ |
| Manufacturer | GRUMMAN |
| Model | G-21A |
| Year Built | 1943 |
| Manufacturer's Serial Number | 1168 |
| Aircraft Type | Fixed wing multi engine |
| Category | Amphibian |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | P&W |
| Engine Model | R-985 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 450 hp (336 kW) |
| Total Horsepower | 900 hp (671 kW) |
| Average Cruising Speed | 150 miles per hour |
| Type of Registrant | Individual |
| Owner Name | MAYES BRETT R |
| Street | 2668 HUSTED RD |
| City | WILLIAMS |
| State | CA |
| Zip Code | 95987-5105 |
| Region | Western-Pacific |
| County | Colusa County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1956-03-30 |
| Certificate Issue Date | 2014-05-22 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-05-31 |
| Status | Valid Registration |
| Mode S Code | 51130761 |
| Mode S Code Hex | A4B1F1 |