| Tail Number / N-Number | N139G |
| Manufacturer | GRIFFITH-THORP |
| Model | T-18 |
| Year Built | 1979 |
| Manufacturer's Serial Number | 375 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not 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 | CARTWRIGHT LYLE E |
| Street | 347 S 6TH AVE |
| City | TUCSON |
| State | AZ |
| Zip Code | 85701-2110 |
| Region | Western-Pacific |
| County | Pima County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1993-10-08 |
| Certificate Issue Date | 2004-09-16 |
| Last Action Date | 2020-12-21 |
| Expiration Date | 2028-05-31 |
| Status | Valid Registration |
| Mode S Code | 50116466 |
| Mode S Code Hex | A09D36 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N139G.
| Tail Number / N-Number | N139G |
| Manufacturer | GRIFFITH MINIPLANE |
| Model | DSA-1 |
| Manufacturer's Serial Number | 101 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 86 miles per hour |
| Type of Registrant | Individual |
| Owner Name | GRIFFITH ROBERT A |
| Street | 209 S MICHIGAN |
| City | ADDISON |
| State | IL |
| Zip Code | 60021 |
| Region | Great Lakes |
| County | Pima County |
| Last Status | Valid Registration |
| Cancellation Date | 1969-09-04 |