# N5447C: Sikorsky S-76 - Status: Valid registration - Airframe: [Sikorsky S-76](https://openairdocs.org/model/sikorsky-s-76) (registry code 8143010, 14 seats) - Data sheets: [TCDS H1NE](https://openairdocs.org/tcds/H1NE) (Sikorsky Aircraft Corporation) (OpenAirDocs) - Serial number: 760180 - Type: Rotorcraft - Engine type: Turbo-shaft - Certificate issued: August 23, 2013 - Expires: August 31, 2029 - Mode S code: A6EA18 - Registered owner: [Mansfield Heliflight Inc](https://openairdocs.org/faa-owner/MANSFIELD%20HELIFLIGHT%20INC) - Location: [Milton, VT](https://openairdocs.org/faa-place/VT/Milton) - Owner type: Corporation - Owner's area on the map: 44.6459° N, 73.1592° W: Placed by OpenAirDocs at the center of ZIP code 05468, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=5447C - Page: https://openairdocs.org/aircraft/N5447C From the FAA registry file of October 24, 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): 0 in force ### Matched by airframe (Sikorsky S-76) None in force. ## Information bulletins (advisory) None matched. ## NTSB investigations None matched to N5447C. ## FAA accident and incident reports None matched to N5447C. ## Service difficulty reports (19) As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR AC2R47C05212011](https://openairdocs.org/sdr/AC2R47C05212011), May 21, 2011: FITTING. BROKEN. ON WALK AROUND PRIOR TO TAKING OFF, THE HERC 201 (MP42) PILOT NOTICED THE RT MLG COWLING HANGING, UPON FUTHER INSPECTION REALIZED THE FWD HINGE HAD CRACKED. REP - [SDR AC2A20101218001](https://openairdocs.org/sdr/AC2A20101218001), Dec 18, 2010: WARNING LIGHT. ILLUMINATED. MAIN TRANSMISSION CHIP LIGHT ILLUMINATED INBOUND TO VENICE. NO SECONDARY INDICATIONS NOTED. - [SDR AC2R20101214001](https://openairdocs.org/sdr/AC2R20101214001), Dec 14, 2010: GEARBOX. MAKING METAL. (AC2R) APPROX 2 MILES FROM LANDING, THE MAIN GEARBOX CHIP LIGHT ILLUMINATED. PERFORMED THE MAIN GEARBOX CAUTION LIGHT ILLUMINATED EMERGENCY PROCEDURE AND LANDED - [SDR AC2A685K](https://openairdocs.org/sdr/AC2A685K), Nov 4, 2010: WARNING LIGHT. ILLUMINATED. NR 2 ENGINE CHIP LIGHT ILLUMINATED INBD TO BASE. FOLLOWED EMERGENCY PROCEDURES CHECKLIST, PLACED NR 2 ENGINE LEVER TO IDLE AND LANDED AS SOON AS PRACTICAL. ENGI - [SDR AC2A119194](https://openairdocs.org/sdr/AC2A119194), Mar 14, 2008: BOLT. CORRODED. NEW BOLTS HAVE A PIT IN THE SHANK OFF THE BOLT. - [SDR AC2A113672](https://openairdocs.org/sdr/AC2A113672), Jan 20, 2007: COUPLING. CRACKED. COUPLING WAS FOUND CRACKED ON 110 HR, AIRFRAME INSPECTION. - [SDR AC2A110338](https://openairdocs.org/sdr/AC2A110338), Jul 19, 2006: FLEX COUPLING. CRACKED. DISCOVERED CRACKED COUPLING DURING 50 HOUR INSPECTION. INSTALLED NEW COUPLING. - [SDR AC2A087919](https://openairdocs.org/sdr/AC2A087919), Jun 2, 2003: LATCH. BROKEN. RT FWD ENGINE COWL LATCH FAILED IN FLIGHT. UPON LANDING IT WAS DISCOVERED THAT THE COWLING HAD LIFTED 2 INCHES ON RIGHT HAND SIDE. THE LATCH HOOK ON THE FWD. LA - [SDR AC2A081172](https://openairdocs.org/sdr/AC2A081172), Oct 13, 2002: SEAL. LEAKING. ENGINE STARTED LEAKING OIL AFTER OIL FLOW CHECK. REPLACED SEAL - [SDR AC2A0000064](https://openairdocs.org/sdr/AC2A0000064), Jun 24, 2000: CONTROL CABLE. DAMAGED. AFTER LANDING ON SS169C, MOVED ENGINE THROTTLES TO GROUND IDLE WHILE LOADING AND UNLOADING PASSENGERS. WHEN THROTTLES MOVED BACK TO FLY, NR 2 THROTTLE MADE A NO - [SDR AC2A0000056](https://openairdocs.org/sdr/AC2A0000056), Jun 22, 2000: METER. CORRODED. PART IS ERODED AT THE METER SET CAUSING STREAKING AND VOIDS IN THE SPRAY PATTERN. REPLACED THE METER SET. (X) - [SDR AC2A0000045](https://openairdocs.org/sdr/AC2A0000045), Jun 4, 2000: PINION GEAR. SPALLED. ENGINE REMOVED FOR METAL IN OIL. UPON DISASSEMBLY OF GEARBOX, HELICAL POWER TRAIN PINION GEAR PN 6893672 WAS FOUND TO HAVE SPALLING ON GEAR TEETH. HELICAL TORQU - [SDR AC2A0000044](https://openairdocs.org/sdr/AC2A0000044), May 31, 2000: SCROLL. DAMAGED. ENGINE WOULD NOT PASS LIMITING CHECK AS OUTLINED IN SIKORSKY S76 FLIGHT MANUAL. ENG ALSO REPORTED FOR LOW POWER. ENG REMOVED. UPON DISASSEMBLY OF TURBINE, 1ST S - [SDR AC2A0000063](https://openairdocs.org/sdr/AC2A0000063), May 11, 2000: FIRE DETECTOR. MALFUNCTIONED. AIRCRAFT DEPARTED ICY ON 135 SERVICE FLIGHT AND APPROX 10 MILES SOUTH OF ICY, NR 2 ENGINE FIRE LIGHT ILLUMINATED AND FIRE WARNING HORN SOUNDED. CANCELLED TONE A - [SDR AC2A0000041](https://openairdocs.org/sdr/AC2A0000041), Apr 25, 2000: TURBINE WHEEL. DAMAGED. ACFT''''''''S NR 2 ENG HAD A CHIP LIGHT AFTER LANDING. CHIP PLUGS REMOVED, ENG FOUND MAKING METAL. METAL CLEARED FROM PLUGS, ENG RUN. CHIP LIGHT AGAIN CAME ON. - [SDR 99ZZZX4439](https://openairdocs.org/sdr/99ZZZX4439), Jul 13, 1999: POTENTIOMETER. FAILED. FEEDBACK POT PREMATURE FAILURE. SUBMITTER STATED SHOULD LAST UNTIL OVERHAUL TIME OF 3,000 HOURS. CAUSED ACTUATOR TO KICK IN-FLIGHT. COMPONENT PN 7690002802106. - [SDR 97ZZZX2859](https://openairdocs.org/sdr/97ZZZX2859), May 1, 1997: SWITCH. SHORTED. FLOAT INFLATED PREMATURELY. FOUND SWITCH ROTATING IN CYCLIC, LOOSE INSTALLATION, WIRE FRAYED. NO SHIELDING OVER SOLDER JOINT, CAUSING SHORT. UNSOLDERED CONNECTI - [SDR 97ZZZX2856](https://openairdocs.org/sdr/97ZZZX2856), May 1, 1997: EXPLOSIVE LINK. FAILED. EXPLOSIVE LINK DID NOT ACTIVATE WHEN FLOATS WERE DEPLOYED. HARNESS TEST OK. REPLACED LINK. - [SDR 97ZZZX97](https://openairdocs.org/sdr/97ZZZX97), Nov 7, 1996: NOZZLE SHIELD. DAMAGED. THE NR 2 ENGINE FIRST STAGE TURBINE NOZZLE SHIELD WAS FOUND TO HAVE AN .8750 INCH BY 1.75 INCH SECTION MISSING AT THE 6 O'CLOCK POSITION. THIS DEFECT WAS FOUND ## STCs that may be installed (OpenAirDocs) (3) Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do. ### Approved for the airframe (Sikorsky S-76) - [STC SR01122NY-D](https://openairdocs.org/stc/SR01122NY-D): Installation of an Avionics Innovations Digital Media Player Model DMP-100. Avionics Innovations - [STC SR00091LA](https://openairdocs.org/stc/SR00091LA): Installation of an RG-380/40B battery. Concorde Battery Corporation - [STC SR01348NY](https://openairdocs.org/stc/SR01348NY) (historical): Installation of boarding steps IAW Key Tech Engineering Services Installation Drawing List IDL00203, Rev B, dated 1/16/01. Keystone Helicopter Corp ## Earlier aircraft with N5447C The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N5447C before. - [Cancelled 1980-11-18](https://openairdocs.org/deregistered/N5447C-1980-11-18): Cessna 210N, S/N 21063788. Exported to Mexico. Owner: [Del Rio Flying Service Inc](https://openairdocs.org/faa-owner/DEL%20RIO%20FLYING%20SERVICE%20INC), [Del Rio, TX](https://openairdocs.org/faa-place/TX/Del%20Rio) ## Related - Other Sikorsky S-76 aircraft: https://openairdocs.org/model/sikorsky-s-76/aircraft.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.