# N500MZ: 1977 Hughes 500D, registration cancelled 2023-12-30

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: December 30, 2023
- Status when cancelled: Sale reported, canceled
- Airframe: [Hughes 500D](https://openairdocs.org/model/hughes-500d) (registry code 4470806)
- Engine: [Allison 250-C20 series](https://openairdocs.org/engine/allison-250-c20-series) (registry code 03020)
- Data sheets: [TCDS H3WE](https://openairdocs.org/tcds/H3WE), [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs)
- Serial number: 770159D
- Year built: 1977
- Type of aircraft: Rotorcraft
- Engine type: Turbo-prop
- Airworthiness: Standard, normal
- Airworthiness date: September 4, 2004
- Last registry action: March 31, 2023
- Mode S code: A63B1B
- Location: [New Berlin, WI](https://openairdocs.org/faa-place/WI/New%20Berlin)
- Owner type: Individual
- Owner's area on the map: 42.9737° N, 88.1554° W: Placed by OpenAirDocs at the center of ZIP code 53146, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N500MZ
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=500MZ
- Page: https://openairdocs.org/deregistered/N500MZ-2023-12-30

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 Hughes 500D: https://openairdocs.org/model/hughes-500d.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 CEN22LA146](https://openairdocs.org/ntsb/CEN22LA146), Mar 17, 2022: Hughes 369 (N500MZ), Adair, IA, substantial damage. Probable cause: The mechanic’s failure to properly torque a fuel control unit B-nut, which resulted in a partial loss of engine power, an attempted autorotation, and an impact with 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 20220317001229A](https://openairdocs.org/incident/20220317001229A), Mar 17, 2022: Hughes 500D (N500MZ), Adair, IA, Destroyed. During flight operations helicopter engine entered a low power setting. Pilot was unable to maintain altitude and subsequently crashed.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.