# N439DS: Sikorsky S-58BT, registration cancelled 2000-11-02

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: November 2, 2000
- Status when cancelled: Triennial form not returned
- Airframe: [Sikorsky S-58BT](https://openairdocs.org/model/sikorsky-s-58bt) (registry code 8141840)
- Data sheets: [TCDS 1H11](https://openairdocs.org/tcds/1H11) (OpenAirDocs)
- Serial number: 58658
- Type of aircraft: Rotorcraft
- Certificate issued: May 18, 1991
- Last registry action: September 19, 2000
- Mode S code: A544E9
- Owner when cancelled: [Aris Helicopters Ltd](https://openairdocs.org/faa-owner/ARIS%20HELICOPTERS%20LTD)
- Location: [San Jose, CA](https://openairdocs.org/faa-place/CA/San%20Jose)
- Owner type: Corporation
- Owner's area on the map: 37.3466° N, 121.9097° W: Placed by OpenAirDocs at the center of ZIP code 95110, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N439DS
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=439DS
- Page: https://openairdocs.org/deregistered/N439DS-2000-11-02

From the FAA registry file of October 29, 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 Sikorsky S-58BT: https://openairdocs.org/model/sikorsky-s-58bt.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 SEA90LA137](https://openairdocs.org/ntsb/SEA90LA137), Jul 16, 1990: Sikorsky S-58BT (N439DS), Ovando, MT, substantial damage. Probable cause: THE PILOT DID NOT MAINTAIN ROTOR RPM AFTER A COMPRESSOR ASSEMBLY BLADE FAILURE. A RELATED FACTOR WAS AN INADEQUATE AUTOROTATION RESULTING IN A HARD LANDING.

## 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 19900716026329A](https://openairdocs.org/incident/19900716026329A), Jul 16, 1990: Skrsky S58BT (N439DS), Ovando, MT, Substantial damage. NR1 engine failed at hover and fire from tailpipe. Delayed autorotation. Hard landing. Engine overheated in hover.

## Other aircraft with N439DS

- [Registered now](https://openairdocs.org/aircraft/N439DS): Skinner David L ACRO SPORT II, S/N 1744

---
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.