# N911NC: 1983 Messerschmitt BK 117, registration cancelled 2013-08-22 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: August 22, 2013 - Status when cancelled: Sale reported, canceled - Airframe: [Messerschmitt BK 117](https://openairdocs.org/model/messerschmitt-bk-117) (registry code 5626010) - Engine: [Lycoming LTS-101 series](https://openairdocs.org/engine/lycoming-lts-101-series) (registry code 41560) - Data sheets: [TCDS H13EU](https://openairdocs.org/tcds/H13EU), [TCDS E5NE](https://openairdocs.org/tcds/E5NE) (OpenAirDocs) - Serial number: S-7026 - Year built: 1983 - Type of aircraft: Rotorcraft - Engine type: Turbo-shaft - Airworthiness: Standard, transport - Airworthiness date: December 20, 1993 - Last registry action: July 26, 2002 - Mode S code: AC9B91 - Location: [Milton, VT](https://openairdocs.org/faa-place/VT/Milton) - Owner type: Individual - 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 was based - The mark today: https://openairdocs.org/aircraft/N911NC - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=911NC - Page: https://openairdocs.org/deregistered/N911NC-2013-08-22 From the FAA registry file of October 31, 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 Messerschmitt BK 117: https://openairdocs.org/model/messerschmitt-bk-117.md ## Service difficulty reports (31) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR HEEA065106](https://openairdocs.org/sdr/HEEA065106), Nov 11, 1999: INDICATOR. INTERMITTENT. INDICATOR INTERMITTENTLY INOPERATIVE, INDICATOR TEST AND FUNCTION. - [SDR HEEA065105](https://openairdocs.org/sdr/HEEA065105), Nov 11, 1999: TRANSMITTER. INTERMITTENT. TORQUE TRANSMITTER NTERMITTENTLY INOPERATIVE. - [SDR HEEA061810](https://openairdocs.org/sdr/HEEA061810), Apr 8, 1999: RECEIVER. MALFUNCTIONED. AFTER WARM-UP, THERE IS CONSTANT FEEDBACK. - [SDR HEEA0015658](https://openairdocs.org/sdr/HEEA0015658), Aug 17, 1998: RADAR. MALFUNCTIONED. INDICATOR SAYS ERROR WHEN GOING THROUGH TEST MODE. - [SDR HEEA0014847](https://openairdocs.org/sdr/HEEA0014847), Jun 22, 1998: SWITCH. LOOSE. ADF/VOR SWITCH IS LOOSE AND NO ADF INDICATION. - [SDR HEEA0014511](https://openairdocs.org/sdr/HEEA0014511), Jun 4, 1998: LIGHT. INOPERATIVE. INSTRUMENT LIGHT IS INOPERATIVE. - [SDR HEEA0013931](https://openairdocs.org/sdr/HEEA0013931), Apr 16, 1998: GPS. FAILED. GPS NOT PICKING UP SATELLITES. - [SDR HEEA0012773](https://openairdocs.org/sdr/HEEA0012773), Feb 5, 1998: TRANSPONDER. FAILED. TRANSPONDER HAS NO OUTPUT. - [SDR HEEA0011798](https://openairdocs.org/sdr/HEEA0011798), Nov 5, 1997: FILTER ASSY. MALFUNCTIONED. FILTER ASSY BYPASS INDICATOR DOES NOT PROPERLY OPERATE. - [SDR HEEA0011643](https://openairdocs.org/sdr/HEEA0011643), Oct 22, 1997: INDICATOR. OUT OF TOLERANCE. ENGINE RPM INDICATOR HIGH OUT OF TOLERANCE ABOVE 50 PERCENT INTERMITTENT OPERATION. - [SDR HEEA0010198](https://openairdocs.org/sdr/HEEA0010198), Jun 23, 1997: ACTUATOR. LEAKING. T/R ACTUATOR LEAKING HYRAULIC FLUID. - [SDR HEEA0010178](https://openairdocs.org/sdr/HEEA0010178), Jun 19, 1997: INDICATOR. INTERMITTENT. MAST MOMENT INDICATOR INTERMITTENT IN FLIGHT. - [SDR HEEA0010177](https://openairdocs.org/sdr/HEEA0010177), Jun 19, 1997: TRANSMITTER. INTERMITTENT. TORQUE TRANSMITTER INTERMITTENT IN FLIGHT. - [SDR HEEA0010048](https://openairdocs.org/sdr/HEEA0010048), Jun 5, 1997: INDICATOR. DEFECTIVE. AFTER ONE HOUR OF USE, NEEDLE DROPS FROM NINETY PERCENT TO FIFTY PERCENT. - [SDR HAIHEEA9597](https://openairdocs.org/sdr/HAIHEEA9597), Apr 24, 1997: BLADE. DEFECTIVE. WEIGHT PACKAGE MOVIAL. S/N 1158 & 1174 - [SDR HAIHEEA9542](https://openairdocs.org/sdr/HAIHEEA9542), Apr 23, 1997: ARMATURE. BRUSHES WORN. START/GEN BRUSHES WORN. SHORTED OUT. RECEIVED REWOUND FROM VENDOR. TIME SINCE REPAIR 258:15. - [SDR HEEA979019](https://openairdocs.org/sdr/HEEA979019), Feb 10, 1997: CONTROL DISPLAY. FAULTY. DIMMING CONTROL NOT WORKING, STAYS BRIGHT. REPLACED V101 PHOTOCELL AND S103 IDT SWITCH. REPAIRED. TESTED. CHECKED 28V LIGHTING. BENCH CHECK GOOD. - [SDR HEEA968811](https://openairdocs.org/sdr/HEEA968811), Dec 30, 1996: MOUNT. CRACKED. ONE LEG OF ENGINE MOUNT CRACKED IN HALF. - [SDR HEEA968297](https://openairdocs.org/sdr/HEEA968297), Oct 14, 1996: INDICATOR. READS HIGH. INDICATES HIGH OUT OF TOLERANCE AT 100%. STICKS ON START. - [SDR HEEA968184](https://openairdocs.org/sdr/HEEA968184), Oct 10, 1996: CONTROL UNIT. MALFUNCTION. ADJUSTMENT KNOBS FOR FREQUENCY CHANGE DON'T WORK PROPERLY. PERFORMED PRELIMINARY INSPECTION. CLEANED WAFERS, FOUND PHOTOCELL (V101) NOT DIMMING. REPLACED V101 P - [SDR HEEA967981](https://openairdocs.org/sdr/HEEA967981), Sep 30, 1996: MANIFOLD. CRACKED. ENGINE LEAK CHECK REVEALED: FUEL LEAKING FROM FUEL MANIFOLD TUBING. REPLACED DISCREPANT PART. - [SDR HEEA967805](https://openairdocs.org/sdr/HEEA967805), Sep 9, 1996: EJECTOR DUCT. DAMAGED. DAMAGE DONE TO EJECTORS. FROM BUMPER PADS THAT ARE MOUNTED TO ENG. COWLING AND AIRFRAME. BUMPER PADS ARE RUBBING HARD ON EXHAUST STACK (EJECTOR) CAUSING WORN AR - [SDR HEEA967599](https://openairdocs.org/sdr/HEEA967599), Jul 31, 1996: CONTROL BOX. DEFECTIVE. ON LCD DISPLAY DIGITS ARE NOT COMPLETE IN SQUELCH SPOTS. CLEANED WAFERS AND DISPLAY CONNECTORS. ALSO REPLACED LOCK RING. REPAIRED. BENCH CHECK GOOD. - [SDR HEEA966434](https://openairdocs.org/sdr/HEEA966434), Jan 12, 1996: CONTROL UNIT. DEFECTIVE. NOT ALL PL TONES MATCH THUMBWHEEL TO DIGITAL READOUT. TROUBLESHOT AND REPLACED 8 EACH CRIMP CONNECTOR SOCKETS. REPAIRED. BENCH CHECK GOOD. - [SDR HEEA956199](https://openairdocs.org/sdr/HEEA956199), Dec 7, 1995: INDICATOR. LIGHT INOP. BENCH CHECK NEEDED. REPLACED DH LIGHT SWITCH ASSY. DS101 DUE TO INOPERATIVE LIGHT. REPAIRED. PERFORMED COMPLETE ALIGNMENT AND CALIBRATION. BENCH CHECK GOOD. - [SDR HEEA956128](https://openairdocs.org/sdr/HEEA956128), Nov 22, 1995: CONTROL. DEFECTIVE. SOME NUMBERS ARE NOT LIGHTING UP AS REPORTED BY PILOT. REPLACED DEFECTIVE IC205 INTEGRATED CIRCUIT. REPAIRED AND UNIT BENCH CHECK GOOD. - [SDR HEEA955180](https://openairdocs.org/sdr/HEEA955180), Jun 13, 1995: INDICATOR. DEFECTIVE. #1 NEEDLE READ 4% LOW AFTER 10 MINUTES OPERATION. - [SDR HEEA955146](https://openairdocs.org/sdr/HEEA955146), Jun 13, 1995: TRANSCEIVER. DEFECTIVE. OCCASIONALLY CUTTING OUT ON TRANSMIT. MIKE AUDIO IS INTERMITTENT. REPLACED BAD CR2 AND CR3 DIODES. REPAIRED. - [SDR 95ZZZX2211](https://openairdocs.org/sdr/95ZZZX2211), Mar 3, 1995: CONTROL UNIT. FAILED. PILOT REPORTED SMELLING SMOKE IN COCKPIT. RETURNED TO BASE. MECHANIC INSPECTED AND FOUND COPILOT INSTRUMENT LIGHT DIMMER CONTROL CAUSE OF SMOKE. FOUND WATER ON - [SDR HEEA954336](https://openairdocs.org/sdr/HEEA954336), Feb 10, 1995: SKYNAV 5000. MALFUNCTION. AUTO DIM NOT WORKING, NOT HOLDING PROGRAMMABLE WAYPOINTS AND KEEPS CYCLING THROUGH SELF TEST. TIME SINCE REPAIR 0:00. - [SDR HEEA954253](https://openairdocs.org/sdr/HEEA954253), Jan 23, 1995: SKYNAV 5000. DEFECTIVE. NOT HOLDING PROGRAMMABLE WAYPOINTS. ENTERED EXTRA WAYPOINTS INTO USER WAYPOINTS. ENTERED "DIRECT TO" FUNCTION AND PULLED POWER PLUG FROM TEST PANEL. AFTER TURNI ## 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 NYC00FA127](https://openairdocs.org/ntsb/NYC00FA127), May 7, 2000: Eurocopter BK-117-A4 (N911NC), Cincinnati, OH, substantial damage. Probable cause: the pilot's misjudgment of his closure rate, while turning to land on the rooftop helipad, which resulted in a collision with the building. Factors in the accident were the tailwind and the stuck… --- 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.