| Tail Number / N-Number | N821RM |
| Manufacturer | CESSNA |
| Model | 172H |
| Year Built | 1967 |
| Manufacturer's Serial Number | 17256414 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | 0-300 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 145 hp (108 kW) |
| Average Cruising Speed | 105 miles per hour |
| Type of Registrant | Co-Ownership |
| Owner Name | ROBINETT DOUGLAS E |
| Other Names |
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| Street | 24502 SELVA RD APT A2 |
| City | DANA POINT |
| State | CA |
| Zip Code | 92629-5225 |
| Region | Western-Pacific |
| County | Orange County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1967-07-14 |
| Certificate Issue Date | 2015-12-19 |
| Last Action Date | 2021-08-12 |
| Expiration Date | 2028-12-31 |
| Status | Valid Registration |
| Mode S Code | 52633025 |
| Mode S Code Hex | AB3615 |