# N747A: 1956 Sikorsky S-55, registration cancelled 2004-01-16

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: January 16, 2004
- Status when cancelled: Valid registration
- Airframe: [Sikorsky S-55](https://openairdocs.org/model/sikorsky-s-55) (registry code 8141602)
- Engine: [AiResearch TPE331 series](https://openairdocs.org/engine/airesearch-tpe331-series) (registry code 01517)
- Data sheets: [TCDS 1H4](https://openairdocs.org/tcds/1H4) (OpenAirDocs)
- Serial number: 55910
- Year built: 1956
- Type of aircraft: Rotorcraft
- Engine type: Turbo-prop
- Airworthiness: Restricted, agriculture and pest control, weather control
- Airworthiness date: April 3, 1989
- Certificate issued: June 23, 2003
- Last registry action: June 23, 2003
- Mode S code: AA0C8B
- Owner when cancelled: [Central Sierra Helicopters Inc](https://openairdocs.org/faa-owner/CENTRAL%20SIERRA%20HELICOPTERS%20INC)
- Location: [Mariposa, CA](https://openairdocs.org/faa-place/CA/Mariposa)
- Owner type: Corporation
- Owner's area on the map: 37.5070° N, 119.9838° W: Placed by OpenAirDocs at the center of ZIP code 95338, within about 10 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N747A
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=747A
- Page: https://openairdocs.org/deregistered/N747A-2004-01-16

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

## NTSB investigations (2)

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 LAX02TA267](https://openairdocs.org/ntsb/LAX02TA267), Aug 30, 2002: Sikorsky S-55T (N747A), Lytle Creek, CA, substantial damage. Probable cause: Failure of the hydraulic system due to contamination in the hydraulic fluid, which resulted in an in-flight loss of control.
- [NTSB ANC67A0021](https://openairdocs.org/ntsb/ANC67A0021), Aug 20, 1966: Sikorsky S-55 (N747A), Galena, AK, substantial damage

## 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 20020830022079A](https://openairdocs.org/incident/20020830022079A), Aug 30, 2002: Skrsky S55 (N747A), Lytle Creek, CA, Substantial damage. (.19) On August 30, 2002, at 1006 hours pacific daylight time, a Sikorsky S-55T, N747A, collided with terrain while attempting a precautionary landing in a dry…
- [Incident 19870610080779I](https://openairdocs.org/incident/19870610080779I), Jun 10, 1987: Skrsky S55 (N747A), Cold Springs, CA, Minor damage. Needles split at idle. The clutch reengaged tearing up gear box. Shut down engine. Possible faulty main drive clutch.

## Other aircraft with N747A

- [Registered now](https://openairdocs.org/aircraft/N747A): Boeing 747SP-27, S/N 21992

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