# N6639U: 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: November 12, 2014
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=6639U
- Page: https://openairdocs.org/aircraft/N6639U

## Aircraft that carried N6639U

- [Cancelled 2014-11-12](https://openairdocs.org/deregistered/N6639U-2014-11-12): Mooney M20D, S/N 134, built 1963. Registration expired, pending cancellation. Owner: [Derickson Ned W](https://openairdocs.org/faa-owner/DERICKSON%20NED%20W), [Tucson, AZ](https://openairdocs.org/faa-place/AZ/Tucson)

## NTSB investigations on N6639U (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 LAX03LA085](https://openairdocs.org/ntsb/LAX03LA085), Jan 24, 2003: Mooney M20D (N6639U), Casa Grande, AZ, substantial damage. Probable cause: Collapse of the landing gear during landing rollout, resulting from the pilot/mechanic's incorrect landing gear locking mechanism (linkage) adjustment.

## FAA accident and incident reports on N6639U (2)

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 20030124001199A](https://openairdocs.org/incident/20030124001199A), Jan 24, 2003: Mooney M20D (N6639U), Casa Grande, AZ, Substantial damage. (.19) On January 24, 2003, about 1140 mountain standard time, a Mooney M20D, N6639U, experienced the collapse of its main landing gear during landing rollout…
- [Incident 19850622052199I](https://openairdocs.org/incident/19850622052199I), Jun 22, 1985: Mooney M20D (N6639U), Napa, CA, Minor damage. During turn off runway after landing and during taxi,gear collapsed. Probable inadvertent retraction.

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