# N4780S: 1951 Sikorsky HRS-1, registration cancelled 2018-07-12

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: July 12, 2018
- Status when cancelled: Registration expired, pending cancellation
- Airframe: [Sikorsky HRS-1](https://openairdocs.org/model/sikorsky-hrs-1) (registry code 8141612)
- Engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016)
- Serial number: 127787
- Year built: 1951
- Type of aircraft: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Restricted, other
- Airworthiness date: April 8, 1966
- Certificate issued: August 5, 1993
- Last registry action: September 30, 2014
- Mode S code: A5E13B
- Owner when cancelled: [Whisper Jet Inc](https://openairdocs.org/faa-owner/WHISPER%20JET%20INC)
- Location: [Kirkland, WA](https://openairdocs.org/faa-place/WA/Kirkland)
- Owner type: Corporation
- Owner's area on the map: 47.7158° N, 122.2137° W: Placed by OpenAirDocs at the center of ZIP code 98034, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N4780S
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4780S
- Page: https://openairdocs.org/deregistered/N4780S-2018-07-12

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 HRS-1: https://openairdocs.org/model/sikorsky-hrs-1.md

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