# Service difficulty reports: JASC 6310 A list on [JASC 6310](https://openairdocs.org/jasc/6310.md). Reports filed under 6310 · Engine/Transmission Coupling, newest first. Page 1 of 16 · 772 reports - [SDR 8HBR20240509069](https://openairdocs.org/sdr/8HBR20240509069.md): Bearing · brinelled · Mar 27, 2025 · N917KF · Robsin R22BETA > BRINELLED SPINDLE BEARINGS DISCOVERED APPROX 99.3 HOURS SINCE NEW, FOUND DURING ROUTINE MAINTENANCE INSPECTION. - [SDR 2024FA0000554](https://openairdocs.org/sdr/2024FA0000554.md): Clutch · making metal · Jul 28, 2024 · N842JH · Hughes 369E > DURING A SCHEDULED 100 HOUR MAINTENANCE INSPECTION ON THE AIRCRAFT. THE MECHANIC QUESTIONED THE DARK BURNT APPEARANCE OF THE GREASE IN THE • BEARING, OVERRUNNING CLUTCH BALL OUTPUT. PER OPERATOR REQUEST THE CLUTCH ASSEMBLY WAS DISASSEMBLED AND A SIGNIFICANT AM - [SDR EVCA09252023](https://openairdocs.org/sdr/EVCA09252023.md): Support · damaged · Sep 21, 2023 · N202AH · Urocop EC130T2 > PERFORMED TRANSMISSION SHAFT BEARING SUPPORT 10HR REOCCURRING AD 2022-01-05, DISCOVERED SHEARED RIVET AND CRACKS ON REAR TRANSMISSION SHAFT BEARING SUPPORT. - [SDR 2024FA0000205](https://openairdocs.org/sdr/2024FA0000205.md): Clutch Actuator · broken · Apr 21, 2023 · N31471 · Robsin R44RAVENII > AFTER PIC LANDED N31471 WITH THE COLLECTIVE FULL DOWN, THE CLUTCH LIGHT ILLUMINATED. AFTER LIGHT HAD BEEN ON FOR 10 SECONDS, PIC PULLED THE CLUTCH CIRCUIT BREAKER IN ACCORDANCE WITH THE R44 POH AND ROLLED DOWN THE THROTTLE. PIC THEN SHUT DOWN THE HELICOPTER IA - [SDR 2023FA0000214](https://openairdocs.org/sdr/2023FA0000214.md): Sheave · unknown · Apr 13, 2023 · N4377U · Robsin R44 > BUMPS OR BUBBLES WERE FOUND IN THE UPPER SHEAVE GROOVES. THESE SEEM TO BE CORROSION POCKETS BETWEEN THE METALIZED PLATING AND THE CAST ALUMINUM BASE. IF THIS CONTINUED IN SERVICE, ACCELERATED DRIVE BELT WEAR WILL OCCUR. - [SDR 2022FA0000568](https://openairdocs.org/sdr/2022FA0000568.md): Sprag Clutch · broken · Oct 3, 2022 · N774CB · Hughes 369E > INITIAL CLUTCH WAS REMOVED FOR A DIFFERENT DISCREPANCY AND WAS FOUND TO HAVE A BAD SPRAG CLUTCH 300 HOURS AFTER OVERHAUL. NEXT CLUTCH WAS FOUND TO HAVE A BAD SPRAG CLUTCH 82 HOURS AFTER OVERHAUL. NEXT CLUTCH WAS FOUND TO HAVE A BAD SPRAG CLUTCH 0 TSO. - [SDR CHIA5149](https://openairdocs.org/sdr/CHIA5149.md): Transmission · overtemp · Jul 19, 2022 · N242CH · Boeing 234 > WE JUST COMPLETED ABOUT 2 HOURS ON A FIRE FIGHTING MISSION 15NM WEST OF BECIN FOREST SERVICE BASE AND WERE RETURNING TO BECIN BASE FOR FUEL. ABOUT HALF WAY BACK TO BASE THE XMSN HOT LIGHT ILLUMINATED ON THE ANNUNCIATER PANEL. WE PULLED OUT THE CHECK LIST AND L - [SDR 2022F00242](https://openairdocs.org/sdr/2022F00242.md): Freewheel Unit · failed · May 18, 2022 · N910BR · Bell 206B3 > THE FREEWHEELING UNIT WAS FAILING CAUSING THE MAIN GEARBOX CHIP LIGHT TO INTERMITTENTLY ILLUMINATE. WHEN THE CHIP DETECTORS WERE INSPECTED THERE WAS NO METAL NOTED. NOTHING APPEARED IN THE OIL FILTER OR SCREEN DURING THE SERVICEABILITY CHECK. - [SDR JYDR20220120016](https://openairdocs.org/sdr/JYDR20220120016.md): None · broken · Jan 19, 2022 · Skrsky S64E > WHILE LANDING FROM A HOVER, AS THE WHEELS TOUCHED DOWN A VIBRATION WAS FELT. PILOTS PULLED EACH ENGINE BACK SEPARATELY AND FOUND VIBRATION COMING FROM #2 ENGINE. AFTER AIRCRAFT SECURE MECHANICS FOUND A PIECE MISSING FROM #2 ENGINE TO MAIN GEAR BOX DRIVE SHAFT - [SDR QMLA2021052420025](https://openairdocs.org/sdr/QMLA2021052420025.md): Transmission · ratcheting · May 20, 2021 · N407VV · Bell 407 > ON TAKEOFF PILOT HEARD A VERY LOUD "BANG" INSIDE THE CABIN. PILOT LOWERED POWER AND SET THE AIRCRAFT BACK DOWN WHERE IT STARTED FROM. DURING INSPECTION BY MAINTENANCE IT WAS FOUND THAT UNDER THE CORRECT CONDITIONS, ROTATING THE TAIL ROTOR CAUSING ROTATION OF - [SDR JYDR20201013282](https://openairdocs.org/sdr/JYDR20201013282.md): Attach Bolt · broken · Oct 13, 2020 · N159AC · Skrsky S64F > PILOTS SUDDENLY FELT A VIBRATION AND HEARD A HOWLING NOISE. THEY RETURNED TO THE LANDING SITE AND SHUT DOWN. AT INSPECTION, MAINTENANCE FOUND 1 OF 3 NAS628-15 BOLT BROKEN IN HALF ON THE NR 2 HIGH SPEED SHAFT ON THE FORWARD END, WHERE IT ATTACHES TO THE FREE - [SDR N3XR20200827001](https://openairdocs.org/sdr/N3XR20200827001.md): Gearbox · contaminated · Aug 19, 2020 · N315ER · Diamon DA42NG > DURING A ROUTINE INSPECTION, THE GEAR BOX MAGNETIC PLUG CONTAINED LARGE PIECES OF METAL. THE GEAR BOX WAS REPLACED WITH A NEW UNIT. - [SDR N3XR20200827002](https://openairdocs.org/sdr/N3XR20200827002.md): Gearbox · making metal · Aug 4, 2020 · N304ER · Diamon DA42NG > DURING A ROUTINE INSPECTION, SEVERAL LARGE PARTICLES WERE FOUND ON THE GEARBOX MAGNETIC DRAIN PLUG. THE GEARBOX WAS REPLACED WITH A NEW UNIT. - [SDR 2020FA0000319](https://openairdocs.org/sdr/2020FA0000319.md): Sprag Clutch · abnormal · Jun 22, 2020 · N441CD · Robsin R44RAVENII > OWNER COMPLAINED OF POWER LOSS DURING LEVEL OFF AND FLARE AFTER DESCENT. HE INSISTED THERE WAS NO "NEEDLE SPLIT". IN SPITE OF THAT, I SUSPECTED AN ISSUE WITH THE OVERRUNNING (SPRAG) CLUTCH. I FLIGHT TESTED AND ALL APPEARED NORMAL. AFTER CHECKING EVERYTHING THA - [SDR N3XR20200827003](https://openairdocs.org/sdr/N3XR20200827003.md): Gearbox · making metal · Jun 19, 2020 · N309ER · Diamon DA42NG > DURINE A ROUTINE INSPECTION, LARGE PIECES OF METAL WERE FOUND ON THE ENGINE GEAR BOX MAGNETIC PLUG. THE GEARBOX WAS REPLACED WITH A NEW UNIT. - [SDR YV3R2019021300022](https://openairdocs.org/sdr/YV3R2019021300022.md): Clutch Actuator · malfunctioned · Feb 11, 2019 · N114VG · Robsin R22BETA > CUSTOMER REPORTED CLUTCH ACTUATOR MOTOR IS SURGING AND RUNNING VERY SLOW. - [SDR 2AFA20170719001](https://openairdocs.org/sdr/2AFA20170719001.md): Clutch Actuator · cracked · Jul 19, 2017 · N188DD · Robsin R44RAVENII > FAILURE OF ACTUATOR ASSEMBLY. THE BRACKETS DISCONNECTING THAT CAUSED THE UPPER BREAK.” MR. WEBSTER ALSO STATED THIS WAS A “MAINTENANCE ISSUE THAT SHOULD HAVE BEEN ADDRESSED. WE HAVE A SERVICE BULLETIN OUT JUST FOR THAT.” HOWEVER, UNDER THE CURRENT SERVICE - [SDR EVGR201611080001](https://openairdocs.org/sdr/EVGR201611080001.md): Sprag Assy · making metal · Oct 13, 2016 · N622 · Robsin R44RAVENII > DURING THE 100 HOUR INSPECTION, THE CLUTCH LUBRICATION INSPECTION WAS PERFORMED PER ROBINSON MM 7.210. WHEN THE OIL WAS INSPECTED SEVERAL PIECES OF METAL WERE FOUND. ROBINSON WAS CONTACTED AND THE CLUTCH ASSEMBLY WAS REMOVED FROM THE AIRCRAFT AND AN OVERHA - [SDR H44R2016051300001](https://openairdocs.org/sdr/H44R2016051300001.md): Cover Plate · worn · May 11, 2016 · N532EZ · Hughes 369FF > DURING REPLACEMENT OF THE OVER RUNNING CLUTCH, A SPECIAL TOOL IS REQUIRED TO TORQUE THE INTERNAL WRENCHED RETENTION NUT INSIDE THE PTO SHAFT OF THE ENGINE. WHEN THE TOOL WAS WITHDRAWN PART OF IT REMAINED STUCK IN THE NUT, THE TECH DID NOT REALIZE THAT THIS HA - [SDR CA151021003](https://openairdocs.org/sdr/CA151021003.md): Sprag Clutch · cracked · Oct 21, 2015 · Robsin R44 > (CAN) FOUND CRACKED SPRAG CLUTCH DURING DISASSEMBLY. - [SDR CA150813007](https://openairdocs.org/sdr/CA150813007.md): Boot · torn · Jul 31, 2015 · Bell 212 > (CAN) ON A POST FLIGHT INSPECTION IT WAS NOTED THE FWD COUPLING BOOT, M/R TRANSMISSION END, HAD SOME SLIGHT GREASE LEAKAGE. THE DRIVE SHAFT WAS REPLACE WITH ANOTHER DRIVE SHAFT. THE BOOT WAS INSTALLED NEW ON FEB 14 2012 AND THE MFG DATE ON THE BOOT WAS FEB 5 - [SDR CA150813003](https://openairdocs.org/sdr/CA150813003.md): Flex Coupling · cracked · Jul 22, 2015 · Snias AS350B2 > (CAN) DURING SHUTDOWN, ROTORS TURNING LOUD CLICKING HEARD FROM COUPLING WHILE ROTORS WERE SLOWING DOWN. COUPLING FOUND CRACKED IN 3 PLACES ALL AROUND, AND GOING THROUGH THE CRIMPED BUSHINGS OF THE OUTER DISK. - [SDR CA150813004](https://openairdocs.org/sdr/CA150813004.md): Boot · disintegrated · Jul 11, 2015 · Bell 412 > (CAN) ACFT HAD A HARD LANDING AFTER A MAIN DRIVESHAFT COUPLING FAILURE. DURING THE INVESTIGATION IT WAS NOTED THERE WAS A HIGH POSSIBILITY OF A DRIVE SHAFT BOOT FAILURE WHICH LEAD TO THE DRIVESHAFT COUPLING, TRANSMISSION END, FAILURE DUE TO AN OVERHEAT. THE - [SDR CA141212009](https://openairdocs.org/sdr/CA141212009.md): Clutch · worn · Dec 10, 2014 · Bell 206B > (CAN) DURING TRAINING, IT WAS NOTICED THAT THE TACH NEEDLES DID NOT SEPARATE WHEN THE THROTTLE WAS ROLLED BACK TO IDLE. FREEWHEEL ASSY WAS REMOVED AND SENT TO O/H SHOP FOR INSPECTION. DURING INSPECTION CLUTCH ASSY WAS DEEMED UNSATISFACTORY. - [SDR CA141103026](https://openairdocs.org/sdr/CA141103026.md): Jackscrew · damaged · Nov 1, 2014 · Robsin R44RAVENII > (CAN) UPON START UP IN THE FIELD AT A REMOTE SITE, THE PILOT FIRED THE ENGINE AS NORMAL AND ENGAGED THE CLUTCH, AS HE WAS AWAITING THE CLUTCH ENGAGEMENT, HE REPORTED HEARING A LOUD BANG AND NOTICED HIS ENGINE RPM FLUCTUATED. HE IMMEDIATELY SHUTDOWN AND CALLED - [SDR CA141103033](https://openairdocs.org/sdr/CA141103033.md): Jackscrew · damaged · Oct 11, 2014 · Robsin R44RAVENII > (CAN) DURING STARTING PROCEDURE, IN A REMOTE SITE, THE PILOT FIRED THE ENGINE AS NORMAL, ENGAGED THE CLUTCH AND WAS WAITING FOR IT TO ACTUATE WHEN HE HEARD A LOUD BANG AND ENGINE RPM INCREASED. HE IMMEDIATELY SHUT THE ENGINE OFF AND CALLLED MAINTENANCE. FOLL - [SDR 2014FA0000435](https://openairdocs.org/sdr/2014FA0000435.md): Belt · failed · Jun 21, 2014 · N6828D · Amtr EXEC162F > AT APPROXIMATELY 300 FEET ALTITUDE, PILOT HEARD A LOUD BANG AND EXPERIENCED AN IMMEDIATE LOSS OF POWER. ATTEMPTED EMERGENCY LANDING RESULTED IN SUBSTANTIAL DAMAGE TO AIRCRAFT BOOM AND MAIN ROTOR BLADES. INVESTIGATION AND ANALYSIS DETERMINED THE MAIN DRIVE BE - [SDR CA140328008](https://openairdocs.org/sdr/CA140328008.md): Housing · cracked · Mar 28, 2014 · Bell 407 > (CAN) DURING OVERHAUL THE FREEWHEEL ASSEMBLY, IT WAS NOTICED THAT A LARGE CRACK HAD FORMED UNDER THE O-RING GROOVE OF THE CHIP DETECTOR HOUSING. SHOULD THE CRACK HAVE CONTINUED AND THE CHIP DETECTOR HOSING HAD BROKEN FREE OF THE FREEWHEEL UNIT, OIL UNDER PRES - [SDR CA140217004](https://openairdocs.org/sdr/CA140217004.md): O-Ring · missing · Jan 26, 2014 · Hughes 369D > (CAN) THE OVER RUNNING CLUTCH WAS PURCHASED AS AN EXCHANGE UNIT. THIS UNIT WAS INSTALLED AT TTAF 16552.9 HRS. THE INSPECTION CRITERIA IS A VISUAL OIL CHECK EACH 100 HRS, 300 HR HOOK TIME INSPECTION AND A 1800 HR OVERHAUL PERIOD. THIS UNIT AT INSTALL WAS TSO OF - [SDR QMLA2014012214010](https://openairdocs.org/sdr/QMLA2014012214010.md): Transmission · making metal · Jan 22, 2014 · N902LC · Doug MD900 > MULTIPLE MAIN TRANSMISSION CHIP LIGHTS, AFTER FOLLOWING CSP 900RMM 2 CHAPTER 63-20-00 & TABLE 601. CHIPS INDICATED ALL UNDER THE LIMITS OF THE CHAPTER BUT COME ON EACH AIRCRAFT RUN UP. - [SDR CA130812004](https://openairdocs.org/sdr/CA130812004.md): Sprag Clutch · failed · Aug 2, 2013 · Robsin R44RAVENII > (CAN) "SUDDEN YAW, GRINDING NOISE AND CLUTCH WARNING LIGHT IN STRAIGHT AN LEVEL FLIGHT, ALL WITHIN LESS THAN A SECOND. LANDED TO INSPECT THE ACFT, BUT COULDN`T FIND ANYTHING WRONG THAT WOULD HAVE BEEN VISIBLE. CONTINUED FLIGHT AFTER DISCUSSING THE ISSUE WITH - [SDR CA130731006](https://openairdocs.org/sdr/CA130731006.md): Shaft · corroded · Jul 31, 2013 · Bell 206B > (CAN) CORROSION WHERE THE FRONT SEAL RUNS ON OUTER DIAMETER OF THE INNER SHAFT. - [SDR CA130617012](https://openairdocs.org/sdr/CA130617012.md): Actuator · worn · Jun 16, 2013 · Robsin R44RAVENII > (CAN) DURING ACFT INSPECTION MOVEMENT WAS NOTED BETWEEN THE CLUTCH ACTUATOR GEARBOX HSG AND SHAFT. - [SDR CA130521019](https://openairdocs.org/sdr/CA130521019.md): Freewheel Unit · blocked · May 17, 2013 · Bell 206B > (CAN) THE REPORTED HE FELT THE ACFT TWITCH, AND YAW, FOLLOWED BY THE NEEDLES ON THE GAUGES FLUCTUATING, GIVING INDICATIONS OF AN ENGINE FAILURE, OR IMPENDING ENGINE FAILURE. THIS WAS FOLLOWED BY A TRANSMISSION CHIP LIGHT INDICATION ON THE WARNING PANEL. ONCE - [SDR CA121130005](https://openairdocs.org/sdr/CA121130005.md): Wire · loose · Nov 28, 2012 · Robsin R44RAVENII > (CAN) PILOT REPORTED INTERMITTENT CLUTCH ACTUATOR WARNING. CLUTCH ACTUATOR REPLACED. CLUTCH ACTUATOR WAS FOUND TO HAVE A LOOSE WIRE ON THE UP LIMIT SWITCH. - [SDR CA121031007](https://openairdocs.org/sdr/CA121031007.md): Seal · leaking · Oct 28, 2012 · Robsin R44RAVENII > (CAN) DURING INSPECTION OF THE ACFT OIL, WAS NOTED LEAKING FROM THE REAR SEAL OF THE CLUTCH ASSEMBLY. SEAL HAD DISLODGED FROM RETAINER AND MIGRATED ALONG CLUTCH SHAFT. CLUTCH ASSEMBLY REPLACED. - [SDR CA121011011](https://openairdocs.org/sdr/CA121011011.md): Sprag Clutch · damaged · Oct 10, 2012 · Hughes 369D > (CAN) DURING THE 100 HOUR INSPECTION, THE ENGINEER NOTICED THAT THE OIL IN THE CLUTCH WAS VERY DARK. HE REMOVED THE ASSY AND DISASSEMBLED THE CLUTCH. THE SPRAG ELEMENTS WERE BROKEN DOWN FROM THE TOP. - [SDR CA121012003](https://openairdocs.org/sdr/CA121012003.md): Actuator · failed · Sep 30, 2012 · Robsin R44RAVENII > (CAN) ACFT WOULD NOT START. FOUND CLUTCH ACTUATOR SWITCH HAD FAILED. CLUTCH ACTUATOR REPLACED. - [SDR CA120928004](https://openairdocs.org/sdr/CA120928004.md): Actuator · failed · Sep 27, 2012 · Robsin R44 > (CAN) ON SHUTDOWN ELECTRIC CLUTCH ACTUATOR SWITCHED TO THE DISENGAGED POSITION BUT DID NOT RESPOND. DOWN LIMIT SWITCH TERMINAL WIRE FOUND BROKEN, BUT STILL COVERED WITH HEAT SHRINK. CLUTCH ACTUATOR REMOVED AND ALL 4 SWITCHES REPLACED NEW. - [SDR CA120813028](https://openairdocs.org/sdr/CA120813028.md): Actuator · unserviceable · Aug 5, 2012 · Robsin R44RAVENII > (CAN) CLUTCH ACTUATOR SWITCH NOT WORKING. CLUTCH ACTUATOR ASSY REPLACED. - [SDR ALGA2012071302](https://openairdocs.org/sdr/ALGA2012071302.md): Adapter · corroded · Jul 13, 2012 · N667AL · Bell 407 > DURING COMPLIANCE WITH 3000 HR O/H OF THE F/W UNIT ASSY, THE ADAPTER WAS DISCARDED DUE TO PITTING AND CORROSION BEYOND MFG LIMITS. - [SDR CA121015003](https://openairdocs.org/sdr/CA121015003.md): Sprag Clutch · cracked · Jul 2, 2012 · Robsin R22BETA > (CAN) CLUTCH ASSEMBLY FOUND NOISY DURING OPERATION. UPON DISASSEMBLY FOUND SPRAG ASSEMBLY CRACKED IN MULTIPLE PLACES. - [SDR CA120618010](https://openairdocs.org/sdr/CA120618010.md): Actuator · intermittent · Jun 12, 2012 · Robsin R44RAVENII > (CAN) CLUTCH ACTUATOR INTERMITTENT. CLUTCH ACTUATOR REPLACED. - [SDR CA120612011](https://openairdocs.org/sdr/CA120612011.md): Actuator · intermittent · May 28, 2012 · Robsin R44 > (CAN) INTERMITTENT CLUTCH WARNING LIGHT IN FLIGHT. CLUTCH ACTUATOR REPLACED. - [SDR ALGA2012051803](https://openairdocs.org/sdr/ALGA2012051803.md): Adapter · corroded · May 18, 2012 · N607AL · Bell 407 > ADAPTER CORRODED BEYOND LIMITS. - [SDR ALGA2012051802](https://openairdocs.org/sdr/ALGA2012051802.md): Adapter · corroded · May 18, 2012 · N607AL · Bell 407 > ADAPTER CORRODED BEYOND LIMITS. - [SDR ALGA201204171201](https://openairdocs.org/sdr/ALGA201204171201.md): Adapter · corroded · Apr 16, 2012 · N272AL · Bell 206L4 > FREE WHEEL UNIT ADAPTER CORRODED BEYOND LIMITS. - [SDR ALGA201203121206](https://openairdocs.org/sdr/ALGA201203121206.md): Adapter · corroded · Mar 12, 2012 · N189AL · Bell 206L4 > FREE WHEEL UNIT ADAPTER HAS PITTING CORROSION BEYOND LIMITS. - [SDR ALGA201203121205](https://openairdocs.org/sdr/ALGA201203121205.md): Housing · corroded · Mar 12, 2012 · N189AL · Bell 206L4 > FREE WHEEL UNIT HOUSING HAS PITTING CORROSION BEYOND LIMITS. - [SDR CA120228019](https://openairdocs.org/sdr/CA120228019.md): Bearing · damaged · Feb 27, 2012 · Skrsky S92A > (CAN) INPUT MODULE WAS REMOVED FROM ACFT DUE TO A RIVET HEAD FOUND ON THE INPUT MODULE CHIP DETECTOR. FINDINGS DURING DISASSEMBLY WERE, THE SOURCE OF RIVET HEAD WAS THE BEARING. THE CONDITION OF THE BEARING WAS UNSERVICEABLE AS IT HAD LOST THE MAJORITY OF IT Next page: https://openairdocs.org/jasc/6310/reports.md?page=2 ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql 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 = '6310' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/jasc/6310/reports --- 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.