| Tail Number / N-Number | N4991M |
| Manufacturer | BEECH |
| Model | 58P |
| Year Built | 1978 |
| Manufacturer's Serial Number | TJ-146 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 6 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | TSIO-520 SER |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 300 hp (224 kW) |
| Total Horsepower | 600 hp (448 kW) |
| Average Cruising Speed | 123 miles per hour |
| Type of Registrant | Individual |
| Owner Name | REGISTRATION PENDING |
| Street | PO BOX 1276 |
| City | ROLLA |
| State | MO |
| Zip Code | 65402-1276 |
| Region | Central |
| County | Phelps County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1978-05-15 |
| Last Action Date | 2022-12-28 |
| Status | Registration pending |
| Mode S Code | 51432016 |
| Mode S Code Hex | A6340E |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4991M.
| Tail Number / N-Number | N4991M |
| Manufacturer | PIPER |
| Model | PA-11 |
| Manufacturer's Serial Number | 11-478 |
| 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) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 67 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | SPEER FLYING SERVICE |
| Street | GILLESPIE FIELD |
| City | EL CAJON |
| State | CA |
| Zip Code | 90001 |
| Region | Western-Pacific |
| County | Phelps County |
| Certificate Issue Date | 1948-06-21 |
| Last Status | Valid Registration |
| Cancellation Date | 1950-11-13 |