# N509Y: 1958 Sikorsky S-55C, 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 S-55C](https://openairdocs.org/model/sikorsky-s-55c) (registry code 8141606)
- Engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016)
- Data sheets: [TCDS 1H4](https://openairdocs.org/tcds/1H4) (OpenAirDocs)
- Serial number: 55691
- Year built: 1958
- Type of aircraft: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Restricted, agriculture and pest control, forest, aerial surveying, patrolling, aerial advertising
- Airworthiness date: May 8, 1979
- Certificate issued: August 5, 1993
- Last registry action: September 30, 2014
- Mode S code: A65D85
- 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/N509Y
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=509Y
- Page: https://openairdocs.org/deregistered/N509Y-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 S-55C: https://openairdocs.org/model/sikorsky-s-55c.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 CHI79FEG21](https://openairdocs.org/ntsb/CHI79FEG21), Jul 30, 1979: Sikorsky S-55C (N509Y), Chillicothe, OH, destroyed

## 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 19790730019359A](https://openairdocs.org/incident/19790730019359A), Jul 30, 1979: Skrsky S55C (N509Y), Chillicothe, OH, Destroyed. Helicopter hit wire while spraying a field.

## Other aircraft with N509Y

- [Cancelled 1941-09-01](https://openairdocs.org/deregistered/N509Y-1941-09-01): Inland R400, S/N R-408. Owner: [Powell Harry S Paul Smith & Tyrrell Smith](https://openairdocs.org/faa-owner/POWELL%20HARRY%20S%20PAUL%20SMITH%20%26%20TYRRELL%20SMITH), [Hynes, CA](https://openairdocs.org/faa-place/CA/Hynes)

---
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.