# N521M: Hawker Siddeley DH.125-3A/522, registration cancelled 1973-02-23

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: February 23, 1973
- Status when cancelled: Valid registration
- Airframe: [Hawker Siddeley DH.125-3A/522](https://openairdocs.org/model/hawker-siddeley-dh-125-3a-522) (registry code 4230130)
- Serial number: 25129
- Type of aircraft: Fixed wing multi engine
- Certificate issued: March 6, 1967
- Mode S code: A68DB8
- Owner when cancelled: [Marathon Oil Company](https://openairdocs.org/faa-owner/MARATHON%20OIL%20COMPANY)
- Location: [Findlay, OH](https://openairdocs.org/faa-place/OH/Findlay)
- Owner type: Corporation
- The mark today: https://openairdocs.org/aircraft/N521M
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=521M
- Page: https://openairdocs.org/deregistered/N521M-1973-02-23

From the FAA registry file of November 4, 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 Hawker Siddeley DH.125-3A/522: https://openairdocs.org/model/hawker-siddeley-dh-125-3a-522.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 CHI73AC057](https://openairdocs.org/ntsb/CHI73AC057), Dec 12, 1972: Hawker-Sdly DH125 (N521M), Findlay, OH, destroyed

## Other aircraft with N521M

- [Cancelled 2017-03-24](https://openairdocs.org/deregistered/N521M-2017-03-24): Aeros AEROS-2, S/N 104, built 2006. Registration expired, pending cancellation. Owner: [Molina Angel H](https://openairdocs.org/faa-owner/MOLINA%20ANGEL%20H), [Rio Rico, AZ](https://openairdocs.org/faa-place/AZ/Rio%20Rico)
- [Cancelled (date not recorded)](https://openairdocs.org/deregistered/N521M-undated): Brunner-Winkle BIRD A, S/N 1047. Owner: [Kimball Aircraft Corp](https://openairdocs.org/faa-owner/KIMBALL%20AIRCRAFT%20CORP)

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