# N4504L: 2011 Robinson Helicopter R44 II, registration cancelled 2020-10-17

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: October 17, 2020
- Status when cancelled: Sale reported, canceled
- Airframe: [Robinson Helicopter R44 II](https://openairdocs.org/model/robinson-helicopter-r44-ii) (registry code 7640122)
- Engine: [Lycoming IO-540-AE1A5](https://openairdocs.org/engine/lycoming-io-540-ae1a5) (registry code 41899)
- Data sheets: [TCDS H11NM](https://openairdocs.org/tcds/H11NM), [TCDS 1E4](https://openairdocs.org/tcds/1E4) (OpenAirDocs)
- Serial number: 13084
- Year built: 2011
- Type of aircraft: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: January 3, 2011
- Last registry action: January 15, 2020
- Mode S code: A5750B
- Location: [Greeley, CO](https://openairdocs.org/faa-place/CO/Greeley)
- Owner type: Individual
- Owner's area on the map: 40.4447° N, 104.6794° W: Placed by OpenAirDocs at the center of ZIP code 80631, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N4504L
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4504L
- Page: https://openairdocs.org/deregistered/N4504L-2020-10-17

From the FAA registry file of November 5, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe.

ADs and bulletins for the Robinson Helicopter R44 II: https://openairdocs.org/model/robinson-helicopter-r44-ii.md

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN19LA162](https://openairdocs.org/ntsb/CEN19LA162), Jun 8, 2019: Robinson R44 (N4504L), Last Chance, CO, substantial damage. Probable cause: The pilot's failure to maintain adequate main rotor rpm while descending with a tailwind during an aerial application maneuver, which resulted in an uncontrolled descent into terrain.

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20190608006239A](https://openairdocs.org/incident/20190608006239A), Jun 8, 2019: Robinson Helicopter Company R44 II (N4504L), Last Chance, CO, Destroyed. While conducting part 137 spraying operations near Last Chance, CO, N4504L experienced a loss of main rotor RPM and impacted terrain in the field being sprayed…

## Other aircraft with N4504L

- [Cancelled 1978-11-09](https://openairdocs.org/deregistered/N4504L-1978-11-09): Evangel Air 4500-300, S/N 004, built 1972

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