# N4172B: not currently registered

- Registered now: No (not in the FAA registry file). The mark may be reserved or free to assign
- Earlier aircraft: 1
- Last cancelled: October 6, 2014
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4172B
- Page: https://openairdocs.org/aircraft/N4172B

## Aircraft that carried N4172B

- [Cancelled 2014-10-06](https://openairdocs.org/deregistered/N4172B-2014-10-06): Aero Commander 520, S/N 520-78, built 1953. Registration expired, pending cancellation. Owner: [National Financing Corp](https://openairdocs.org/faa-owner/NATIONAL%20FINANCING%20CORP), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington)

## NTSB investigations on N4172B (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 UNK65X0610](https://openairdocs.org/ntsb/UNK65X0610), Nov 8, 1964: Aero Cmdr 520 (N4172B), Chicago, IL, substantial damage

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