# N604X: Sikorsky S-55B, registration cancelled 1975-12-22

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: December 22, 1975
- Status when cancelled: Valid registration
- Airframe: [Sikorsky S-55B](https://openairdocs.org/model/sikorsky-s-55b) (registry code 8141604)
- Data sheets: [TCDS 1H4](https://openairdocs.org/tcds/1H4) (OpenAirDocs)
- Serial number: 55459
- Type of aircraft: Rotorcraft
- Certificate issued: March 8, 1972
- Mode S code: A7D828
- Owner when cancelled: [Trans Alaska Helicopters Inc](https://openairdocs.org/faa-owner/TRANS%20ALASKA%20HELICOPTERS%20INC)
- Location: [Seattle, WA](https://openairdocs.org/faa-place/WA/Seattle)
- Owner type: Corporation
- The mark today: https://openairdocs.org/aircraft/N604X
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=604X
- Page: https://openairdocs.org/deregistered/N604X-1975-12-22

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-55B: https://openairdocs.org/model/sikorsky-s-55b.md

## Other aircraft with N604X

- [Cancelled 2009-12-14](https://openairdocs.org/deregistered/N604X-2009-12-14): Shultz Jeffrey D SONEX, S/N 604, built 2006. Triennial form not returned. Owner: [Shultz Jeffrey D](https://openairdocs.org/faa-owner/SHULTZ%20JEFFREY%20D), [Dixon, MO](https://openairdocs.org/faa-place/MO/Dixon)

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