| Tail Number / N-Number | N221S |
| Manufacturer | TEXTRON AVIATION INC |
| Model | 525C |
| Year Built | 2018 |
| Manufacturer's Serial Number | 525C0288 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 11 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Engine Manufacturer | WILLIAMS |
| Engine Model | FJ44-4A |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Thrust per Engine | 3,443 pounds-force (15.3 kN) |
| Total Thrust | 6,886 pounds-force (30.6 kN) |
| Type of Registrant | Corporation |
| Owner Name | INSTEEL INDUSTRIES IN |
| Street | 1373 BOGGS DR |
| City | MOUNT AIRY |
| State | NC |
| Zip Code | 27030-2145 |
| Region | Eastern |
| County | Surry County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2018-12-24 |
| Certificate Issue Date | 2019-02-23 |
| Last Action Date | 2021-09-20 |
| Expiration Date | 2029-02-28 |
| Status | Valid Registration |
| Mode S Code | 50363110 |
| Mode S Code Hex | A1E648 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N221S.
| Tail Number / N-Number | N221S |
| Manufacturer | BELL |
| Model | 47D1 |
| Manufacturer's Serial Number | 476 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 3 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | FRANKLIN |
| Engine Model | 6V4 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 210 hp (157 kW) |
| Average Cruising Speed | 78 miles per hour |
| Type of Registrant | Government |
| Owner Name | SOUTHERN ILLINOIS UNIVERSITY |
| Other Names |
|
| Street | SOUTHERN ILLINOIS AIRPORT |
| City | CARBONDALE |
| State | IL |
| Zip Code | 62901 |
| County | Surry County |
| Country | US |
| Airworthiness Classification | Multiple |
| Airworthiness Date | 1962-08-06 |
| Certificate Issue Date | 1969-10-23 |
| Last Action Date | 2008-06-17 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2013-04-15 |