| Tail Number / N-Number | N4991C |
| Manufacturer | TIERNEY |
| Model | TAYLOR MONOPLANE JT1 |
| Manufacturer's Serial Number | JT1/89 |
| 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 |
| Type of Registrant | Corporation |
| Owner Name | MID ATLANTIC AIR MUSEUM |
| Street | 11 MUSEUM RD |
| City | READING |
| State | PA |
| Zip Code | 19605-9407 |
| Region | Eastern |
| County | Berks County |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2005-05-24 |
| Last Action Date | 2022-11-16 |
| Expiration Date | 2030-04-30 |
| Status | Valid Registration |
| Mode S Code | 51432005 |
| Mode S Code Hex | A63405 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4991C.
| Tail Number / N-Number | N4991C |
| Manufacturer | BRANTLY |
| Model | B-2 |
| Manufacturer's Serial Number | 26 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 75 miles per hour |
| Type of Registrant | Individual |
| Owner Name | MARTIN HERMAN L |
| Street | PO BOX 598 |
| City | WALLA WALLA |
| State | WA |
| Zip Code | 99362 |
| Region | Northwest Mountain |
| County | Berks County |
| Certificate Issue Date | 1967-12-18 |
| Last Status | Valid Registration |
| Cancellation Date | 1968-01-22 |