| Tail Number / N-Number | N923SM |
| Manufacturer | ROBINSON HELICOPTER COMPANY |
| Model | R22 MARINER |
| Year Built | 1991 |
| Manufacturer's Serial Number | 1923M |
| Aircraft Type | Rotorcraft |
| Category | Amphibian |
| Builder Certification | 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) |
| Type of Registrant | LLC |
| Owner Name | N923SM LLC |
| Street | 6 SHEFFIELD RD HANGAR 1 |
| City | REHOBOTH BEACH |
| State | DE |
| Zip Code | 19973 |
| Region | Eastern |
| County | Sussex County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1991-08-26 |
| Certificate Issue Date | 2014-11-10 |
| Last Action Date | 2020-07-03 |
| Expiration Date | 2027-11-30 |
| Status | Valid Registration |
| Mode S Code | 53145353 |
| Mode S Code Hex | ACCAEB |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N923SM.
| Tail Number / N-Number | N923SM |
| Manufacturer | PIPER |
| Model | PA-34-200T |
| Manufacturer's Serial Number | 347970069 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 7 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 105 miles per hour |
| County | Sussex County |
| Last Status | N-Number Assigned – but has not yet been registered |
| Cancellation Date | 1989-04-19 |