JASC 6321

Service difficulty reports · 275

Reports filed under 6321 · Main Rotor Brake, 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 = '6321'
  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 4DSR20251023002Brake · out of toleranceDURING A SCHEDULED 12YR INSPECTION, THE MGB ROTOR BRAKE WAS FOUND TO BE OUT OF TOLERANCE/LOOSE AND REQUIRED REPLACEMENT. RECEIVED ROTOR BRAKE P/N: 350A32-0500-02 FROM NAMPA VALLEY HELICOPTERS IN "REPAIRED" STATUS/WORK. AFTER VISUAL RECEIVING INSPECTION, THE ATOct 23, 2025 · N613TC · Snias AS350B3SDR 454A0110100922Brake Caliper · crackedFOUND CRACKING ON EACH BRAKE CALIPER PISTON. WEAR PLATES DO NO COMPLETELY SPAN PISTON. FOUND ABNORMAL WEAR ON HOUSING FROM CONTACT WITH PADS AND ROTOR DISK. THIS IS THE SECOND INSTANCE.Feb 11, 2025 · N529MD · Bolkms BK117C2SDR 2023FA0000029Mount Bracket · crackedTHE RIGHT AFT MAIN ROTOR BRAKE TURN BUCKLE MOUNT WAS FOUND CRACKED AT THE AFT SIDE OF THE BOLT HOLE BORE.Jan 16, 2023 · N412UH · Bell 407SDR 2022FA0000646Axle · corrodedCUSTOMER REPORTED ROTOR BRAKE INOPERATIVE ON ARRIVAL AT REPAIR STATION FOR SCHEDULED INSPECTION. TROUBLESHOOTING REVEALED THE ROTOR BRAKE CALIPER WOULD NOT LOWER WHEN THE ROTOR BRAKE WAS RELEASED. FURTHER EVALUATION REVEALED THE ROTOR BRAKE ACTUATOR WAS INOPOct 26, 2022 · N9NJ · Agusta AW139SDR QR9R20211029004Switch · faultyACFT RESTRICTED FROM ROTOR BRAKE USE DUE TO ROTOR BRAKE CAUTION DOES NOT ILLUMINATE ON CAD WHEN BRAKE IS ENGAGED. REPLACED MICRO-SWITCH (IPC: 63-51-10-01-420); MOC OK.Oct 29, 2021 · Bolkms BK117C2SDR AC2A2021102913901Actuator · stuckROTOR BRAKE INOP, FOUND ROTOR BRAKE ACTUATOR WILL NOT ACTUATE (STUCK)Oct 28, 2021 · N639MC · Agusta AW139SDR QR9R20210902003Pad · failedROTOR BRAKE FAILED TO STOP ROTOR SYSTEM IN ALLOWED TIME. AIRCRAFT RESTRICTED FROM ROTOR BRAKE USE.Sep 2, 2021 · Bolkms BK117C2SDR QR9R20210901004Pad · unreliableROTOR BRAKE FOUND TO BE INEFFECTIVE (CAUTION ADVISORY ON CAD INDICATED THAT IT WAS ENGAGING). ROTOR BRAKE CHECK PERFORMED IAW 05-60-00, 6-1. ROTOR BRAKE CONFIRMED AS INEFFECTIVE (TOOK 2 MINUTES AND 25 SECONDS FOR ROTOR TO STOP).Sep 1, 2021 · Bolkms BK117C2SDR HDNA20210822005Caliper · brokenTHE LEFT ROTOR BRAKE CALIPER LOWER MOUNTING EAR BROKE IN ADDITION TO THE TURN BUCKLE ATTACHMENT AT THE CALIPER WAS COMPROMISED. THIS RESULTED IN CONTACT BETWEEN THE CALIPER, ROTOR BRAKE ROTOR DISC AND ENGINE DRIVE SHAFT. MINOR DAMAGE WAS SUSTAINED TO THE ROTAug 22, 2021 · N414UH · Bell 407SDR AC2A2021072213901Actuator · stuckROTOR BRAKE CAS FAIL MESSAGE ILLUMINATED ON SHUTDOWN, ACTUATOR STUCK IN UP POSITION.Jul 21, 2021 · N639DS · Agusta AW139SDR AC2A2020111413901Control Module · defectiveROTOR BRAKE WILL NOT BUILD PRESSURE. ROTOR BRAKE CONTROL MODULE WAS FOUND TO BE DEFECTIVE. MODULE WAS PREVIOUSLY REPAIRED BY MANUFACTURE AND BECAME DEFECTIVE IN 379.9 HOURS OF OPERATION.Nov 13, 2020 · N639DS · Agusta AW139SDR QMLA2018101218111Brake Assy · damagedUPON DISASSEMBLY OF ROTOR BRAKE. BRAKE ASSEMBLY DRIVE FLANGE AND HYDRAULIC DRIVE COUPLING HAD EXTREME HEAT DAMAGE AND METAL TRANSFER. THE DAMAGE CONTAINED TO THESE ITEMS PARTS WERE ORDERED AND REPLACED GROUND RUN MOC CHECKS COMPLETED AND AIRCRAFT RETURNED TO SOct 9, 2018 · N397LG · Snias AS350B3SDR KBTR201901280002Bracket · crackedDURING 3600 HOUR OVERHAUL FOUND BRAKE CALIPER MOUNTING BRACKET CRACKED, STARING AT LOWER CENTER CORNER EXTENDING AROUND BOLT HOLE ON BOTH SIDES. NO OBVIOUS SIGNS OF WHAT STRESSES CAUSED THE CRACK, NOR ANY INDICATION OF AN INDECENT.Jul 26, 2018 · N407LF · Bell 407SDR KBTR201901280001Bracket · crackedDURING 3600 HOUR OVERHAUL FOUND BRAKE CALIPER MOUNTING BRACKET CRACKED, STARING AT LOWER CENTER CORNER EXTENDING AROUND BOLT HOLE ON BOTH SIDES. NO OBVIOUS SIGNS OF WHAT STRESSES CAUSED THE CRACK, NOR ANY INDICATION OF AN INDECENT.Jul 26, 2018 · N407LF · Bell 407SDR KBTR201901280003Bracket · crackedDURING 3600 HOUR OVERHAUL FOUND BRAKE CALIPER MOUNTING BRACKET CRACKED, STARING AT LOWER CENTER CORNER EXTENDING AROUND BOLT HOLE ON BOTH SIDES. NO OBVIOUS SIGNS OF WHAT STRESSES CAUSED THE CRACK, NOR ANY INDICATION OF AN INDECENT.Jun 5, 2018 · N808MT · Bell 407SDR QMLA2018040418040Pad · wornABOUT 18 MINUTES INTO FLIGHT, ROTOR BRAKE CAUTION LIGHT ILLUMINATED WITH AN ACCOMPANYING ODOR. LANDED AIRCRAFT AND SHUTDOWN AND VERIFIED THERE WAS NO SMOKE OR FIRE. CALLED MAINTENANCE. MAINTENANCE INSPECTED ROTOR BRAKE, FOUND TO BE FREE AND OPERATING NORMAL, HApr 4, 2018 · N530LN · Urocop EC135P2SDR KBTR2018102355371Bracket · brokenAFTER PERFORMING A 3600 HOUR ROTOR BRAKE CALIPER OVERHAUL ON CALIPER P/N:427-340-352-113, S/N: 656 THE CALIPER WAS SENT BACK TO THE CUSTOMER AND AFTER SOME TIME WE WERE NOTIFIED, AT A TSO OF 106.5 HOURS, THAT THE SUPPORT BRACKET P/N:D0296-2 HAD BROKEN IN TO TWMar 29, 2018 · N766MT · Bell 407SDR KBTR201810235537Bracket · brokenAFTER PERFORMING A 3600 HOUR ROTOR BRAKE CALIPER OVERHAUL ON CALIPER P/N:427-340-352-113, S/N: 644 THE CALIPER WAS SENT BACK TO THE CUSTOMER AND AFTER SOME TIME WE WERE NOTIFIED, AT A TSO OF 106.5 HOURS, THAT THE SUPPORT BRACKET P/N:D0296-2 HAD BROKEN IN TO TWMar 29, 2018 · N766MT · Bell 407SDR 7AJA2015031500001Brake · brokenAIRCRAFT TOOK OFF FROM AIRPORT WITH NO INDICATION OF ANY DIFFICULTIES IN FLIGHT AND UNEVENTFUL LANDING. UPON PARKING ACFT, PILOT PERFORMED POST FLIGHT INSPECTION AND FOUND RT MLG BRAKE CALIPER BROKEN, ALSO DAMAGES TO RT MLG WHEEL WELL, FUEL LINES IN WHEEL WELLMar 15, 2015 · N587PB · Beech C90ASDR QMLA2014041614038Planetary Gear · unserviceableDURING A6031RT, MAST INSPECTION, UPON SEPARATION OF THE MAST & MGB, SEVERAL METALLIC FERROUS FLAKES WAS LOCATED ON & AROUND THE EPICYCLICAL REDUCTION GEAR. AFTER FURTHER INVESTIGATION, 1 OF 5 SATELLITE PLANETARY GEARS PN 350A32-1082-03, SN L31442 OF THE EPICApr 16, 2014 · N546AM · Urocop AS365N3SDR CA140127011Flange · damaged(CAN) AFTER SHUTDOWN, DURING ROTOR BRAKE APPLICATION, CREW REPORTED GRINDING NOISE COMING FROM TRANSMISSION AREA, AND EXCESSIVE VIBRATIONS WERE FELT THROUGH THE AIRFRAME. ACFT WAS INSPECTED BY MAINTENANCE, THE ROTOR BRAKE FLANGE AND OUTPUT SPLINE WERE FOUND TJan 10, 2014 · Agusta AW119MKIISDR CA130812008Bolt · sheared(CAN) WHILE PERFORMING INSPECTION, ACCORDING WITH BHT-407-MM1, CH 5-00-00, PARA 5-20 & DOC B0223-OM4, PARA 1.2. ROTOR BRAKE GUIDE BOLTS FOUND SHEARED, ROTOR BRAKE PADS WORN EXCESSIVELY AND CAUSED CALIPER WEAR.Aug 12, 2013 · Bell 407SDR AC2A201304150001Brake · false indicationROTOR BRAKE CAS MESSAGE APPEARED SHORTLY AFTER TAKEOFF. FOLLOWED EMERGENCY PROCEDURES AND RETURNED TO DEPARTURE. TESTED SWITCHES IN CALIPER AND FOUND THEM TO BE SERVICEABLE. RECONNECTED CONNECTOR PLUGS AND PERFORMED AN OPS CHECK ON THE ROTOR BRAKE SYS AND FApr 8, 2013 · N427HV · Bell 427SDR ALGA201202141208Housing · corrodedROTOR BRAKE HOUSING CORRODED BEYOND LIMITS.Feb 14, 2012 · N647AL · Bell 407SDR ALGA201202141207Housing · corrodedROTOR BRAKE HOUSING CORRODED BEYOND LIMITS.Feb 14, 2012 · N647AL · Bell 407SDR ALGA201202141206Housing · corrodedROTOR BRAKE HOUSING CORRODED BEYOND LIMITS.Feb 14, 2012 · N647AL · Bell 407SDR ALGA201202141205Housing · corrodedMAIN ROTOR BRAKE HOUSING CORRODED BEYOND LIMITS.Feb 14, 2012 · N647AL · Bell 407SDR GAKA2012F00040Caliper · out of adjustMADE AN UNSCHEDULED LANDING AFTER DEPARTURE, PILOT NOTICED A CAS MESSAGE "ROTOR BRAKE". THERE WERE NO ADVERSE INDICATIONS THAT THE ROTOR BRAKE HAD ACTUALLY INADVERTANTLY ENGAGED. MX INSPECTED THE ROTOR BRAKE SYS AND MADE ADJUSTMENTS TO THE SENSOR THAT CALCJan 20, 2012 · N428SL · Bell 429SDR 2011FA0000652Pad · crackedROTOR BRAKE PAD EDGES CRACKED OR CHIPPED FROM NEW. WHEN INSTALLING ON DISK PAD COMES APART AT EDGE. VIBRATION OF RIVET GUN CAUSES FURTHER CRACKING OR CHIPPING AT EDGE WHEN INSTALLING ON THE DISK. PROBABLE CAUSE BAD BATCH OF ROTOR BRAKE PADS. MFG F0210 CODESep 21, 2011SDR PG92011F00010Brake · crackedROTOR BRAKE PAD CRACKED FROM NEW. EDGES FALLING APART WHILE INSTALLED ON ACFT. R & R WITH ONLY 94.7 HRS PART TT. PROBABLE CAUSE MAY BE BAD BATCH. FOUND A 1200T INSPECTION. MFRF0210 CODE.Sep 21, 2011 · N893PA · Urocop EC130B4SDR CA101110007Nut · loose(CAN) PILOT MADE PRECAUTIONARY LANDING SHORTLY AFTER TAKEOFF FROM BASE IN AIRPORT INFIELD DUE TO A SUDDEN ABNORMAL VIBRATION. UPON INSPECTING THE AIRCRAFT IT WAS DETERMINED THAT THE INPUT PINION/ROTOR BRAKE FLANGE NUT HAD BECOME LOOSE. FURTHER INSPECTION REVNov 8, 2010 · Aerosp AS355NSDR QMLA2010102510071Disc · unserviceableDURING LIFT OFF, ROTORBRAKE WARNING LIGHTS ILLUMINATED, FOLLOWED BY TRANSMISSION CHIP LIGHTS AND TRANSMISSION OIL PRESSURE. CREW REPORTED SMELLING SOMETHING BURNING. PILOT IMMEDIATELY LANDED ACFT AND SHUTDOWN. INSPECTED ROTORBRAKE AREA AND FOUND ROTORBRAKE DISOct 25, 2010 · N220LN · Bell 222UTSDR JBZA2010F00100Disc · crackedPILOT REPORTED "ROTOR BRAKE CHATTER DURING USE". MECHANIC FOUND ROTOR BRAKE DISK HAD (2) CRACKS, ONE 1.1250" LONG, ONE 1 14" LONG, LOCATED ROUGHLY 180 DEGREES APART, BOTH CRACKS EMANATING OUTWARD TO THE EDGE OF THE DISK. INSTALLED NEW BRAKE ROTOR DISK. FAILED Apr 20, 2010 · N38RX · Urocop EC135P2SDR CA081204004Handle · damaged(CAN) DURING CRUISE, THE ROTOR BRAKE HANDLE DOWN WARNING LIGHT TURN ON INTERMITTENTLY. THE WARNING LIGHT SWITCH IS ADJUSTED TO WARN PILOT IF THE HANDLE IS NOT IN ITS NEUTRAL OR DOWN POSITION AND TO VERIFY IF THE REASON IS NOT THE PILOT`S SEAT BELT BEING UNDER Dec 3, 2008 · Bolkms BO105SSDR QML2008F00016Brake · out of adjustON REPOSITION FLIGHT, APPROX 6 MILES FROM LANDING, ROTOR BREAK AND MASTER CAUTION ILLUMINATED. THIS IS A LAND AS SOON AS POSSIBLE EVENT. CONSULTED THE CHECKLIST. VERIFIED POSITION OF ROTOR BREAK HANDLE. THE HANDLE WAS SECURE. IN ADDITION, VERIFIED TRANSMIOct 16, 2008 · N402MA · Bell 222USDR CA071130012Brake · damaged(CAN) MECHANICAL DAMAGE TO ROTOR BRAKE GRID ASSEMBLY, DUE TO IMPROPER OPERATION. TRIGGER WAS NOT DEPRESSED PRIOR TO ENGAGING ROTOR BRAKE HANDLE CAUSING MECHANICAL DAMAGE TO GRID ASSEMBLY. NEW GRID ASSEMBLY INSTALLED (TC NR 20071130012)Nov 30, 2007 · Urocop EC120BSDR U0GA113886Damper · shearedPILOT FELT VIBRATION WHEN ROTOR BRAKE WAS ENGAGED AFTER LANDING AND SHUTDOWN. POSTFLIGHT INSPECTION REVEALED THE DAMPER HAD SHEARED AT THE ROD END FLUSH WITH THE OUTER THREADED PORTION OF THE DAMPER ASSEMBLYJan 23, 2007 · N822MM · Agusta A119SDR AC2A110523Caliper · leakingFOUND CALIPER LEAKING / REPLACED CALIPERJul 22, 2006 · N7159J · Bell 206L3SDR KBM2006F00222Brake Disc · wornMAIN ROTOR BRAKE DISK, WORN BEYOND LIMITS, REMOVED AND REPLACED. (K)Jun 21, 2006 · N230SH · Snias AS350B2SDR KBM2006F00157Brake Cable · seizedROTOR BRAKE CABLE, UNIT SEIZED, REMOVED AND REPLACED. (K)Apr 15, 2006 · N345SH · Snias AS350B2SDR CA060310006Flange · failedATTEMPTED TO REPLACE A PART DAMAGED BEYOND REPAIR. A PART WAS LOCATED AND ACQUIRED TO REPLACE DAMAGED UNIT. PART WAS DELIVERED TO US FOR REVIEW. SUPPLIER SUBMITTED VARIOUS CERTIFICATION DOCUMENTS TO VALIDATE PART. PART JOURNAL IS UNDERSIZE AND IN NEED OF AMar 10, 2006 · Skrsky S61ASDR AC2A108368Puck · chippedDURING AN INSPECTION THEY FOUND THE ROTOR BRAKE PUCK CHIPPED/ THE CALIPER WAS REPLACED.Feb 12, 2006 · N427GT · Bell 427SDR CA060216002Caliper · binding(CAN) PISTON DOES NOT RETRACT INTO CALIPER HOUSING AFTER BRAKING CAUSING ROTOR BRAKE PAD TO REMAIN IN CONTACT WITH BRAKE DISC. (TC NR 20060216002)Jan 24, 2006 · Bolkms BO105CSDR CA060130001Spring · brokenDURING THE FIRST 100 HR INSPECTION CARRIED OUT ON THE AIRCRAFT, IT WAS NOTICED THAT THE ABOVE SPRING WAS BROKEN. IT APPEARS TO HAVE BROKEN AT THE UPPER ATTACHMENT POINT WHERE IT ATTACHES TO THE LOWER ROTOR BRAKE CALIPER ARM. THE SPRING WAS REPLACED WITH NEW.Jan 16, 2006 · Robsin R44RAVENIISDR ALG2005F00079Caliper · looseDURING DAILY INSPECTION THE MECHANIC FOUND ROTOR BRAKE BOLTS LOOSE AND A PAD WAS MISSING, REMOVED AND REPLACED BOTH CALIPERS WITH SERVICEABLE SET AND THE AC WAS RETURNED TO SERVICE. (K)Oct 15, 2005 · N265AL · Bell 206L4SDR ALGA106433Bearing · failedTRANSMISSION ASSY MAKING METAL, DISSEMBLED FOUND ROTOR BRAKE QUILL DUPLEX BEARING BEARING BREAKING DOWN. / REMOVEN AND REPLACED DUPLEX BEARING P/N 222-342-420-101Sep 22, 2005 · Bell 412SDR ALG2005F00066Bolt · defectiveDURING MAINTENANCE SERVICE CHECK, THE LT ROTOR BRAKE CALIPER WAS FOUND TO BE DEFECTIVE. THE FOLLOWING ITEMS WERE REMOVED AND REPLACED WITH SERVICEABLE COMPONENTS: ROTOR BRAKE DISK, BOLTS AND 2 ROTOR BRAKE CALIPERS. IAW MM. (K)Aug 21, 2005 · N265AL · Bell 206L4SDR YTRR104408Caliper · crackedON ROUTINE INSPECTION FOUND CALIPER HOUSING CRACKED AT MOUNTING FLANGE ON ROTOR BRAKE.Jun 30, 2005 · N595RL · Bell 407SDR ERAA096629Oil Cooler · leakingLEAK AT TOP OF NR 2 COOLING AREA. SENT TO DRAKE AIR FOR REPAIR. CLEANED, FLUSHED, REPAIRED/OVERHAULED, TESTED AND INSPECTED.May 25, 2004 · N129EH · Bolkms BO105SSDR CA040420001Structure · damaged(CAN) THE COLLECTIVE FRICTION ASSEMBLY WAS REPORTED FEELING LOOSE. LOOSENESS WAS TRACED TO THE BRAKE BOX, WHICH WAS MOUNTED WITH 6MM BOLTS IN 10MM HOLES.Apr 15, 2004 · Bolkms BO105S
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