JASC 6420

Service difficulty reports · 907

Reports filed under 6420 · Tail Rotor Head, newest first.

Query with SQL
duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE jasc_code = '6420'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR QR9R2026040600002Rotor Head · out of limitsTHE LAMINATED PILE ASSEMBLY WAS RECEIVED FROM SUPPLY WITH A GAP EXCESS OF .0078".Apr 6, 2026 · Bolkms BK117C2SDR 8LFA202603100002Nut · looseDURING FLIGHT IT WAS NOTED AN ABNORMAL METALLIC NOISE EMANATING FROM THE TAIL BOOM AREA. IT WAS DECIDED TO PERFORM A PRECAUTIONARY LANDING DUE TO THE NOISE HEARD. UPON INSPECTION OF THE AIRCRAFT THE TAIL ROTOR MAST NUT WAS FOUND IN A LOOSE CONDITION. SAFETYMar 10, 2026 · N463LF · Bell 407SDR QR9R2026021800001Rotor Head · out of limitsRECEIVED LAMINATED PILE ASSEMBLY FROM SUPPLY WITH .013'' GAP IN LAMINATED PILE. MAX IS .008''.Feb 18, 2026 · Bolkms BK117C2SDR QR9R2025040200001Bearing · frayedBEARING SLEEVE ASSY TEFLON LINER WAS FOUND TO BE WORN (FRAYED) BEYOND LIMITS. PART WAS RECEIVED NEW FROM SUPPLY. REPLACED IAW AMM 64-20-00, 4-2 & 64-20-00, 4-1.Apr 2, 2025 · Bolkms BK117C2SDR QMLA2025021020015Cotter Pin · missingYAW SERVO ACTUATOR BRACE HAD A MISSING COTTER PIN ON POST FLIGHT INSPECTION. VERIFIED TORQUE ON T/R NUT. INSTALLED COTTER PIN. ALL MAINTENANCE COMPLETED. AIRCRAFT RELEASED TO REVENUE SERVICE. #MEC-005650Feb 10, 2025 · N102HN · Urocop EC135P1SDR QR9R2024050700001Unknown · misalignedDURING INSTALLATION OF THE LAMINATED PILE ASSEMBLY, THE REPAIRED CENTER BORE DID NOT ALLOW PROPER ALIGNMENT OF THE THROUGH BOLT.May 7, 2024 · Bolkms BK117C2SDR 2023F00311Spherical Bearin · wornON DEPARTURE AND CLIMB OUT, THE PILOT NOTICED A VIBRATION IN THE T/R PEDALS THAT WOULD INCREASE WITH POWER WAS INCREASES. HE RETURNED TO THE AIRPORT AND LANDED UNEVENTFULLY. MAINTENANCE FOUND THE T/R TEETERING BEARINGS WERE WORN EXCESSIVELY.Oct 18, 2023 · N452MH · Bolkms BK117C2SDR QR9R2022112200002Sleeve · out of limitsINNER SLEEVE ASSY WAS RECEIVED FROM SUPPLY WITH REPLACEMENT BUSHINGS IMPROPERLY HONED WHICH PREVENTS BOLT FROM PASSING THROUGH.Nov 22, 2022 · Bolkms BK117C2SDR QR9R2022111500001Bolt · out of toleranceFITTED BOLT WAS RECEIVED FROM SUPPLY OUT OF TOLERANCE. MINIMUM LIMIT FOR OUTSIDE DIAMETER IS 0.038" IAW AMM 64-20-00, 6-3 F1 D.2.C. SHANK OUTSIDE DIAMETER OF BOLT MEASURED 0.3737".Nov 15, 2022 · Bolkms BK117C2SDR 2022F00337Damper · departedON A NORMAL APPROACH TO THE H AT THE NORTH RAMP, AT ABOUT 150 AGL, WE SUDDENLY FELT A STRONG VIBRATION. WE PROCEEDED TO LAND AND SHUT DOWN ON THE H (NO TAXI). POST FLIGHT REVEALED THAT ONE TAIL ROTOR DAMPER DEPARTED THE AIRCRAFT.Aug 29, 2022 · N152PH · Agusta AW139SDR QR9R20220609002Sleeve · gougedAFTER RECEIVING PART FROM AIRBUS, MAINTENANCE DETECTED THE INNER SLEEVE ASSY WAS GOUGED BEYOND LIMITS.Jun 9, 2022 · Bolkms BK117C2SDR QR9R20220405001Ballast · damagedWHILE PERFORMING MAINTENANCE TO REPLACE T/R WEIGHTS, T/R WEIGHT STOPPED HALFWAY ON THE FORK WHILE BEING THREADED. INTERNAL THREADS ARE DAMAGED.Apr 5, 2022 · Bolkms BK117C2SDR EVCA20210623002Support Fitting · seizedON THE P/N 206-033-426-001 SUPPORT FITTING ASSY., THE MOUNTING EARS WHICH PROVIDES THE PIVOT POINT FOR T/R CONTROL BELLCRANK P/N 206-001-763-001, WE DISCOVERED THAT THE PIVOT BOLT WAS SEIZED INSIDE THE MOUNT BUSHINGS AND ITS BUSHINGS MOVING WITHIN THE MOUNTINJun 21, 2021 · N239AE · Bell 206L1SDR QR9R20210611001Bearing · out of toleranceSYSTEMIC AND PREMATURE FAILURE OF THE T/R HEAD SPHERICAL BEARINGS RESULTING IN EXCESSIVE RADIAL PLAY AND TAIL ROTOR VIBRATIONS.Jun 11, 2021 · Bolkms BK117C2SDR 2020F00359Bearing · wornDURING TAIL ROTOR BALANCE, FEATHER BEARINGS WERE FOUND WORN. BLADES WERE SENT BACK TO MANUFACTURER FOR BEARING REPLACEMENT. DURING INITIAL INSPECTION A DE-BONDED INSPECTION WAS DISCOVERED ON THE SPAR LINE.Aug 13, 2020 · Bell 206L1SDR X2RL2020061800001Bearing · seizedPILOT COMPLAINED OF STICKY T/R PEDAL MOVEMENT, FOUND T/R SWASHPLATE PIVOT BEARING SEIZED. REMOVED T/R SWASHPLATE AND SENT IT FOR REPAIR, INSTALLED SERVIVEABLE UNIT. WE HAVE 7 INCIDENTS IN THE LAST YEAR WITH THESE BEARINGS 369A7951-13 SEIZING, ALL UNDER 200 HOJun 18, 2020 · N717MA · Hughes 369DSDR YV3R2020050900258Elastomer · defectiveCUSTOMER REPORTED BEARING, ELASTOMER P/N: B361-2 HAD A CRACK IN THE RUBBER BETWEEN ELASTOMER AND CASE.Apr 28, 2020 · Robsin R44SDR 2019FA0000414Trunnion · scoredPILOT REPORTED A MAIN ROTOR VIBRATION. UPON TRACK AND BALANCE OF THE MAIN ROTOR IT WAS DISCOVERED THAT THE VIBRATION WAS FROM THE TAIL ROTOR. THIS WAS NOT A COMMON OCCURRENCE AS THE TAIL ROTOR UNDERGOES A DETAILED INSPECTION EVERY 200-HOURS. IT IS VERY UNCOMMONov 20, 2019 · N291HC · Agusta AW109SPSDR YV3R2019101220198Bearing · failedCUSTOMER REPORTED TAIL ROTOR PITCH CONTROL P/N: C031-1 HAS ROUGH BEARINGS.Oct 3, 2019 · Robsin R44SDR CA190319022Hub · malfunctioned(CAN) PRIOR TO DELIVERY TO CUSTOMER, THE PILOT NOTICED THE COUPLING TEETH WERE NOT ENGAGED WITH THE YOKE. SHIP HAD FLEW FOR FERRY , TT 11HRS. TRANSMISSION OF POWER MAINTAINED BY FRICTION DUE TO HIGH TORQUE VALUE.Mar 18, 2019 · Bell 429SDR CA190304021Nut · loose(CAN) DURING PRE-FLIGHT CHECK THE TAILROTOR MAST NUT WAS FOUND LOOSE. AS EVERY MORNING A LICENSED MECHANIC CARRIED OUT THE PRE-FLIGHT CHECK AND FOUND THE DEFECT. IT`S THE SAME MECHANIC WHO CHECKED THE TAIL ROTOR THE DAY BEFORE, AND HE` S 100 PERCENT SURE THATFeb 26, 2019 · Bell 429SDR CA190222008Hub · damaged(CAN) IT WAS REPORTED BY BELL: (FLIGHT SAFETY REPORT). AIRCRAFT COMES IN FOR RECONFIGURATION. AT DAILY INSPECTION, EXCESSIVE GAP WAS FOUND BETWEEN HUB AND BLADE ASSEMBLY. (NO TORQUE, HAND-TIGHT). NUT WAS DUE FOR RE-TORQUING AT 200HRS INSPECTION AND SHIP WAS 18Feb 18, 2019 · Bell 429SDR 2018FA0000433Bushing · looseDURING A WALK AROUND INSPECTION THE TECHNICIAN NOTICED THAT THE ROCKER ARM ASSEMBLY ON THE TAIL ROTOR HUB ASSEMBLY WAS VERY LOOSE. FURTHER INVESTIGATION REVEALED THAT THE BEARING HAD BECOME LOOSE IN THE ROCKER ARM ASSEMBLY. IN THIS APPLICATION THE BEARING ISSep 10, 2018 · N45BZ · Agusta AW109SPSDR 2018FA0000357Hub · crackedINVESTIGATION REVEALED THE TAIL ROTOR AND UPPER TAIL ROTOR GEARBOX ASSEMBLY TO BE MISSING FROM THE PRIMARY ACCIDENT SITE AND WAS LOCATED APPROXIMATELY ONE-HALF MILE AWAY BY THE AIRCRAFT OWNER. THE GEARBOX DRIVE SHAFT WAS SHEARED AND REMAINED WITH THE HELICOPTESep 7, 2018 · N5901X · Hynes B2ASDR MKHR2018091300000Bolt · shearedDURING CRUISE FLIGHT THE PILOT EXPERIENCED AN EXCESSIVE TAIL ROTOR VIBRATION. THE PILOT THEN EXECUTED A PRECAUTIONARY LANDING. WHEN CREW ARRIVED TO INVESTIGATE THE VIBRATION THE INITIAL DISCOVERED WAS THAT THE OUTBOARD TAIL ROTOR FORK BOLT WAS SHEARED.Aug 8, 2018 · N369MH · Hughes 369DSDR JYDR20170324074Bracket · missingWHILE CONDUCTING A TAIL ROTOR BALANCE SESSION, BALANCE CHANGED. VISUAL INSPECTION OF THE TAIL ROTOR HEAD SHOWED AN VERNIER BRACKET HAD FALLEN OFF. VISUAL INSPECTION OF THE AREA SHOWED NO OTHER DAMAGE. TAIL ROTOR BALANCED TO WITHIN LIMITS.Mar 22, 2017 · Skrsky S64ESDR 2A6R2016022201Bearing · shearedTAIL ROTOR HUB ASSY, PN: 429-012-101-117, SN: ZC21 WAS REMOVED DUE TO INBD BEARING, PN: 429-3112-103-113 BECAME DELAMINATED CAUSING HUB TO SHIFT WHICH CAUSED ADDITIONAL DAMAGE TO THE HUB ASSY. HUB ASSY WAS SENT TO REPAIR STATION FOR REPAIR. DURING INSPECTIONFeb 22, 2016 · N911ED · Bell 429SDR 2A6R2016FA0000093Bearing · damagedTAIL ROTOR HUB ASSY, PN: 429-012-101-115, SN: ZC19 WAS REMOVED DUE TO INBD BEARING, PN: 429-3112-103-115 BECAME DELAMINATED CAUSING HUB TO SHIFT WHICH CAUSED ADDITIONAL DAMAGE TO THE HUB ASSEMBLY. HUB ASSY WAS SENT TO REPAIR BS FOR REPAIR. DURING INSPECTION Feb 22, 2016 · N911NM · Bell 429SDR CA160119009Rotor · separated(CAN) ACFT WAS ON AN AERIAL APPLICATION MISSION WHEN IT WAS REQUIRED TO MAKE A FORCED LANDING. INITIAL REPORTS STATE THE TAIL ROTOR SEPARATED FROM THE ACFT.Oct 15, 2015 · Bell 206L3SDR CA150922013Bearing · damaged(CAN) DURING THE OVERHAUL OF A TAIL ROTOR ASSY THE NEEDLE BEARING ON THE CONTROL LEVER WAS FOUND TO BE DAMAGED DURING INSTALLATION AT THE FACTORY. WE HAVE CHECK ANOTHER LEVER AND FOUND THE SAME ISSUE.Sep 22, 2015 · Bell 212SDR CA150501002Bearing · worn(CAN) DURING ROUTINE INSPECTION, EXCESS PLAY OBSERVED IN TAIL ROTOR PITCH LINK. ATTACHED VIDEO SHOWS THE PRESENT CONDITION.Apr 28, 2015 · Bell 429SDR CA150327013Nut · cracked(CAN) DURING A SCHEDULED TAIL ROTOR REMOVAL AME WENT TO REMOVE THE TAIL ROTOR CROSSHEAD, 206-011-857-001. RETAINING NUT AND THERE WAS NO TORQUE, AND THOUGH STRANGE, IT WAS CRACKED RIGHT AT THE SLOT.Mar 24, 2015 · Bell 206BSDR CA150204012Bearing · dislodged(CAN) DURING PREFLIGHT, PILOT NOTICED BEARING DISLODGED FROM LINK. PILOT STATES THE LINK WAS NOT LIKE THAT THE PREVIOUS DAY DURING PREFLIGHT.Jan 27, 2015 · Bell 429SDR CA150127002Bearing · worn(CAN) T/R P/C LINK BEARING, LINK, AND BEARING FAILURE OF A 429 T/R P/C LINK BEARING, LINK PN 429-012-112-101, BEARING, PN 429-312-107-103 ON. ALONG WITH THE DAMAGE TO THE LINK WAS DAMAGE TO THE ASSOCIATED PITCH HORN AND PITCH HORN BUSHING. WE HAVE REVISED Jan 22, 2015 · Bell 429SDR 2014FA0000669Nut · corrodedCORROSION EXCESSIVE IN THE MAST BEARING RETAINING NUT AREA. AREA J IN THE MFG CR&O MANUAL.Nov 14, 2014 · Bell 206ASDR 2A6R201411201572Elastomer · failedTR FLAPPING BEARING ELASTOMER FAILURE & DELAMINATION AT 1054.25 HOURS. SLL IS 15,000 HOURS.Nov 14, 2014 · N911KX · Bell 429SDR CA141023007Bearing · making metal(CAN) THE ROTOR SYS WAS FOUND TO BE INCREASING IN VIBRATION. CHECKED THROUGH THE SYSTEM AND FOUND THE BEARINGS WHEN PURGED OF GREASE WERE SHOWING FINE METAL PARTICLES. CARRIED OUT A WEIGHTED ROTATIONAL TEST ON PITCH HOUSINGS AND FOUND THE BEARINGS TO BE A BIOct 6, 2014 · Hughes 269C1SDR CA140908028Yoke · unserviceable(CAN) DURING THE DAILY INSPECTION IT WAS NOTICED THAT 1 TAIL ROTOR YOKE FEATHERING BEARING OUTER RACE STAKE HAD FAILED. UPON FURTHER INVESTIGATION ALL 4 TAIL ROTOR YOKE FEATHERING BEARING OUTER RACE STAKES HAD FAILED.Sep 4, 2014 · Bell 412EPSDR CA140626002Shaft · worn(CAN) WHEN THE TAIL ROTOR WAS ROTATED CLOCKWISE OR COUNTER CLOCKWISE, A NOISE WAS DETECTED. AFTER INVESTIGATION, IT WAS DISCOVERED THAT A PLAY EXISTED AT THE ASSY POINT OF THE FRONT SHAFT AND THE FRONT FLANGE.Jun 25, 2014 · Snias AS350BASDR 3GMA2014052801Bearing · unstakedON A PREFLIGHT INSPECTION, FOUND BEARING OF TAIL ROTOR PITCH LINK UNSTAKED & LOOSE IN PITCH LINK.May 16, 2014 · N482LF · Bolkms BK117C2SDR CA140325006Bearing · misinstalled(CAN) THE FEATHERING BEARING WAS STAKED FAR TOO TIGHT. CAUSING RESTRICTION ON TAIL ROTOR CONTROL. THIS WAS NOTED ON A PRE FLIGHT POST MAINTENANCE INSPECTION. THE BLADE ARE THE VAN HORN BLADES INSTALLED UNDER STC SH10-22. ASSY REMOVED AND NEW ASSEMBLY INSTALLMar 24, 2014 · Bell 206L4SDR CA140127001Bolt · sheared(CAN) IN FLIGHT PILOT COULD FEEL VIBRATION IN THE AIRFRAME, DECIDED TO LAND. ENGINEER INSPECTED AIRFRAME INCLUDING REMOVAL OF DRIVESHAFT COVERS AND COWLS AS REQUIRED AND A DETAILED INSPECTION OF THE TAIL ROTOR AND DRIVE SYS ACCOMPLISHED. A TEST FLIGHT WAS ACJan 24, 2014 · Bell 206L4SDR CA140109003Plug · leaking(CAN) ACFT HAD JUST DEPARTED FROM AN OFFSHORE PLATFORM WHEN THE T/R PEDALS LOCKED UP AT APPROXIMATELY MID-TRAVEL. PILOT CONTINUED ON AND MADE AN UNEVENTFUL EMERGENCY LANDING. AT THIS TIME, T/R FLAPPING BEARINGS ARE SUSPECT, BUT INITIAL INSPECTION HAS REVEALEDDec 18, 2013 · Bell 206L4SDR CA131118028Slip Ring · failed(CAN) DURING A 50HR BY-WEEKLY INSPECTION, ENGINEER DISCOVERED THAT THE DUPLEX BEARING IN THE TAIL ROTOR SLIP RING HAD DETERIORATED BEYOND ACCEPTABLE LIMITS.Nov 18, 2013 · Agusta AW139SDR CA131107007Rod · cracked(CAN) DURING A VISUAL INSPECTION, A CRACK WAS FOUND AT THE AFT END OF THE TAIL ROTOR ACTUATING ROD, WHERE THE BEARING IS SWAGED.Nov 7, 2013 · Snias AS350BASDR CA131114002Pitch Horn · damaged(CAN) RAISED CENTER LUG OF PITCH HORN FOULING ON YOKE. BOLT HOLES FOR HORN ATTACHMENT AND WASHER WEIGHTS MIS-LOCATED APPROXIMATELY .05". NO PN OR SN VISIBLE, HOWEVER A ETCHED HEAT CODE " HT617A " CAN BE SEEN.Oct 24, 2013 · Bell 206BSDR CA131002009Slip Ring · failed(CAN) DURING A POST FLIGHT WALK AROUND, FROM A 1 HR FLT, IT WAS NOTED THE FIPS WIRING ON THE TAIL ROTOR WAS DAMAGED. INSPECTION REVEALED THAT THE SLIP RING ASSY HAD SEIZED CAUSING THE DRIVE PIN TO SHEAR THE DRIVE LINKS AND ALSO CAUSED THE 4 WIRING BUNDLES TO Oct 1, 2013 · Agusta AW139SDR CA130820004Bolt · sheared(CAN) DURING CRUISE FLIGHT, THE ACFT DEVELOPED A SUDDEN AND SEVERE VIBRATION. THE PILOT IMMEDIATELY LANDED AND SHUTDOWN. INSPECTION OF THE ACFT SHOWED THE INBD BOLT SECURING TAIL ROTOR PITCH LINK TO THE TAIL ROTOR GRIP HAD SHEARED AND THE TAIL ROTOR BLADES HAug 15, 2013 · Bell 204BSDR CA130809008Bearing · worn(CAN) FOUND TAIL ROTOR HALF MOON BEARINGS WEARING QUICKLY OVER SEVERAL DAILY INSPECTIONS IN AREAS REFERENCED IN DOCUMENT AMM 64-10-00, 6-1B SECTION 10 AND FIGURE SHEET 04, DETAIL H CONCERNING LAMINATED BEARINGS. SEPARATION ALONG THE INBD BONDING AREA EVIDENT Aug 8, 2013 · Snias AS350B2SDR CA130813005Bearing · cracked(CAN) TAIL ROTOR HALF SHELL BEARINGS CONSIST OF 4 SEPARATE BEARINGS TO MAKE 1 SET. 2 OF THE 4 BEARINGS WERE FOUND WITH CRACKS THAT EXTENDED AROUND A CORNER OF THE RUBBER AND CONTINUED ALONG THE OTHER EDGE AND THE CRACKS WERE BEYOND ALLOWABLE LIMITS. THE HALFAug 2, 2013 · Snias AS350B2
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