# N855TC: 1956 Sikorsky S55B - Status: Valid registration - Airframe: [Sikorsky S55B](https://openairdocs.org/model/sikorsky-s55b) (registry code 8141603, 12 seats) - Engine: [Wright R-1300-3D](https://openairdocs.org/engine/wright-r-1300-3d) (registry code 67134) - Data sheets: [TCDS 1H4](https://openairdocs.org/tcds/1H4) (Centerpointe Aerospace Inc.) (OpenAirDocs) - Serial number: 551005 - Year built: 1956 - Type: Rotorcraft - Engine type: Reciprocating - Airworthiness: Standard, normal - Airworthiness date: May 31, 2006 - Certificate issued: September 21, 2021 - Expires: September 30, 2028 - Mode S code: ABBB97 - Registered owner: [Sierra Aeronautics LLC](https://openairdocs.org/faa-owner/SIERRA%20AERONAUTICS%20LLC) - Location: [Franklin, KY](https://openairdocs.org/faa-place/KY/Franklin) - Owner type: LLC - Owner's area on the map: 36.7254° N, 86.5646° W: Placed by OpenAirDocs at the center of ZIP code 42134, within about 8 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=855TC - Page: https://openairdocs.org/aircraft/N855TC From the FAA registry file of October 21, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. ## ADs that may apply (OpenAirDocs): 19 in force ### Matched by airframe (Sikorsky S55B) - [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07): Ground Proximity System · Airbus Helicopters 47, 206, 210 and 237 more. Effective Jun 22, 2023 - [AD 66-04-03](https://openairdocs.org/ad/66-04-03): Main Rotor Blades · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 3 more. Effective Apr 27, 1976 - [AD 75-22-12](https://openairdocs.org/ad/75-22-12): Inflight Power Loss · Sikorsky S-55, S-55B and S-55C with STC SH125WE or SH127WE. Effective Oct 31, 1975 - [AD 75-04-02](https://openairdocs.org/ad/75-04-02): Main Rotor Spindles · Orlando Helicopter Airways CH-19E, H-19A, H-19D and 8 more. Effective Feb 19, 1975 - [AD 73-16-01](https://openairdocs.org/ad/73-16-01): Engine Turbine Failure · Sikorsky S-55, S-55B and S-55C with STC SH127WE. Effective Jul 31, 1973 - [AD 70-12-04](https://openairdocs.org/ad/70-12-04): Main Rotor Shaft Cracks · Sikorsky S-55, S-55B, S-55C and 1 more. Effective Jun 17, 1970 - [AD 67-29-07](https://openairdocs.org/ad/67-29-07): Azimuth Control Rod Assembly · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more. Effective Nov 3, 1967 - [AD 67-17-06](https://openairdocs.org/ad/67-17-06): Pylon Lower Ring · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more. Effective May 21, 1967 - [AD 65-08-02](https://openairdocs.org/ad/65-08-02): Main Rotor Blades · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 11 more. Effective Apr 9, 1965 - [AD 63-05-02](https://openairdocs.org/ad/63-05-02): Main Rotor Blades · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more. Effective Mar 6, 1963 - [AD 60-13-04](https://openairdocs.org/ad/60-13-04): Rotor Shank Rod · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-51 and 3 more - [AD 56-23-03](https://openairdocs.org/ad/56-23-03): Horizontal Hinge Pin Assembly · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more - [AD 56-16-03](https://openairdocs.org/ad/56-16-03): Main Rotor Blade Inspection · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-51 and 3 more - [AD 55-25-04](https://openairdocs.org/ad/55-25-04): Tail Cone Skin Reinforcements · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more - [AD 54-20-02](https://openairdocs.org/ad/54-20-02): Support Assembly Cracks · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more - [AD 54-19-02](https://openairdocs.org/ad/54-19-02): Servo Safety Clip · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more - [AD 54-16-01](https://openairdocs.org/ad/54-16-01): Main Transmission · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more - [AD 54-13-01](https://openairdocs.org/ad/54-13-01): Star Assembly Bolt Replacement · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more - [AD 54-01-03](https://openairdocs.org/ad/54-01-03): Fuel Strainer Screen · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more ### Matched by engine (Wright R-1300-3D) None in force. ### Historical (superseded or no longer in force) - [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13) (historical): Ground Proximity System · Airbus Helicopters K-225, K-190A, K-240 and 237 more. Effective Dec 9, 2021 ## Information bulletins (advisory) None matched. ## NTSB investigations (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB WPR11LA356](https://openairdocs.org/ntsb/WPR11LA356), Jul 25, 2011: Sikorsky S-55B (N855TC), Brewster, WA, substantial damage. Probable cause: The pilot did not maintain main rotor rpm while hovering in gusting wind conditions. ## 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; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Accident 20110725015669A](https://openairdocs.org/incident/20110725015669A), Jul 25, 2011: Sikorsky S55B (N855TC), Brewster, WA, Minor damage. Individual was conducting cherry drying (hover oge) when wind gust pushed him towards a power line. Pilot pulled pitch to clear line. RPM bled off. After… - [Incident 20100624038849I](https://openairdocs.org/incident/20100624038849I), Jun 24, 2010: Sikorsky S55D (N855TC), Bridgeport, WA, Minor damage. During low level hover cherry drying, pilot let helicopter drift into a wind machine and one blade of the helicopter hit the propeller of the wind machine.… ## Service difficulty reports None filed for this aircraft. ## Related - Other Sikorsky S55B aircraft: https://openairdocs.org/model/sikorsky-s55b/aircraft.md - STCs for the Sikorsky S55B: https://openairdocs.org/model/sikorsky-s55b/stcs.md - The Wright R-1300-3D engine: https://openairdocs.org/engine/wright-r-1300-3d.md --- 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.