# N6639U: 1963 Mooney M20D, registration cancelled 2014-11-12

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: November 12, 2014
- Status when cancelled: Registration expired, pending cancellation
- Airframe: [Mooney M20D](https://openairdocs.org/model/mooney-m20d) (registry code 5870210)
- Engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514)
- Data sheets: [TCDS 2A3](https://openairdocs.org/tcds/2A3) (OpenAirDocs)
- Serial number: 134
- Year built: 1963
- Type of aircraft: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: February 6, 1963
- Certificate issued: December 6, 2003
- Last registry action: December 15, 2009
- Mode S code: A8C304
- Owner when cancelled: [Derickson Ned W](https://openairdocs.org/faa-owner/DERICKSON%20NED%20W)
- Location: [Tucson, AZ](https://openairdocs.org/faa-place/AZ/Tucson)
- Owner type: Individual
- Owner's area on the map: 32.3026° N, 111.1825° W: Placed by OpenAirDocs at the center of ZIP code 85743, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N6639U
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=6639U
- Page: https://openairdocs.org/deregistered/N6639U-2014-11-12

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 Mooney M20D: https://openairdocs.org/model/mooney-m20d.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 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 (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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