| Tail Number / N-Number | N51EP |
| Manufacturer | PIPER |
| Model | PA-60-602P |
| Year Built | 1982 |
| Manufacturer's Serial Number | 60-8265018 |
| 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 | LYCOMING |
| Engine Model | IO-540 SER |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 300 hp (224 kW) |
| Total Horsepower | 600 hp (448 kW) |
| Type of Registrant | LLC |
| Owner Name | ESA MONTANA LLC |
| Street | 690 NORTHSTAR CT |
| City | BOULDER |
| State | CO |
| Zip Code | 80304-1021 |
| Region | Northwest Mountain |
| County | Boulder County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1982-05-28 |
| Certificate Issue Date | 2018-01-04 |
| Last Action Date | 2020-12-24 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 51457610 |
| Mode S Code Hex | A65F88 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N51EP.
| Tail Number / N-Number | N51EP |
| Manufacturer | PALACIOS E R/PETERSON J D |
| Model | LOEHLE 5151 |
| Manufacturer's Serial Number | 51515684213 |
| 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 |
| County | Boulder County |
| Last Action Date | 1996-06-18 |
| Last Status | N-Number assigned as a Non Type Certificated (Amateur) but has not been registered that is pending cancellation |
| Cancellation Date | 2011-06-13 |