# Service difficulty reports: JASC 6330 A list on [JASC 6330](https://openairdocs.org/jasc/6330.md). Reports filed under 6330 · Main Rotor Transmission Mount, newest first. Page 1 of 13 · 603 reports - [SDR QMLA2025011720003](https://openairdocs.org/sdr/QMLA2025011720003.md): Mount · delaminated · Jan 14, 2025 · N189AM · Bell 407 > PILOT REPORTED AN UNUSUAL VIBRATION IN FLIGHT. AFTER INSPECTING TRANSMISSION CORNER MOUNTS WE FOUND THAT THE LH CORNER MOUNTS WERE DELAMINATING/SEPARATING. WE JUST INSTALLED THESE CORNER MOUNTS ON 10/11/25 AND SHOULDN'T HAVE FAILED ALREADY. - [SDR 2023FA0000275](https://openairdocs.org/sdr/2023FA0000275.md): Restraint · unstaked · May 25, 2023 · N505FW · Bell 505 > SUPPORT BEARINGS IN TRANSMISSION RESTRAINT P/N SLS-030-910-109, HAVE BECOME "UN-STAKED" RESULTING IN A 1TO 1 VERTICAL VIBRATION. - [SDR 2A6R2021122262705](https://openairdocs.org/sdr/2A6R2021122262705.md): Unknown · unknown · Dec 22, 2021 · N527BF · Urocop EC135P2 > AFTER REMOVAL OF MAIN GEAR BOX FOR OTHER MAINTENANCE. FOUND THE LEFT XY FITTING P/N L533M2001103 AND THE RIGHT XY FITTING P/N L533M2002103 CORRODED. CLEANED CORROSION AND FOUND BOTH OUT OF LIMITS. THE LEFT ONE IS GETTING REPLACE. THE RIGHT WAS JUST OUT OF - [SDR 8LFA20190104001](https://openairdocs.org/sdr/8LFA20190104001.md): Fitting · cracked · Jan 4, 2019 · N776LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT HAND PLATE FITTING CRACKED. - [SDR 8LFA20180820001](https://openairdocs.org/sdr/8LFA20180820001.md): Fitting · cracked · Aug 20, 2018 · N786LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR QMLA2018060518067](https://openairdocs.org/sdr/QMLA2018060518067.md): Fitting · cracked · Jun 5, 2018 · N353LL · Agusta A119 > FOUND CRACKED RT TRANSMISSION FITTING, 75MM LONG. - [SDR QMLA2018052918064](https://openairdocs.org/sdr/QMLA2018052918064.md): Fitting · cracked · May 21, 2018 · N355LL · Agusta A119 > FOUND A CRACKED RT TRANSMISSION FITTING DURING AN EDDY CURRENT INSPECTION IAW EO 49-5300-EO-2335. - [SDR QMLA2018052988065](https://openairdocs.org/sdr/QMLA2018052988065.md): Fitting · cracked · May 18, 2018 · N352LL · Agusta A119 > FOUND A CRACKED LT TRANSMISSION FITTING, FOUND DURING AN EDDY CURRENT INSPECTION IAW EO 49-5300-EO-2335. - [SDR 8LFA2018051608001](https://openairdocs.org/sdr/8LFA2018051608001.md): Fitting · cracked · May 8, 2018 · N616LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION LEFT PLATE FITTING CRACKED. - [SDR 2018FA0000130](https://openairdocs.org/sdr/2018FA0000130.md): Fitting · cracked · Apr 3, 2018 · N9379K · Agusta AW119MKII > CRACKED MGB SUPPORT FITTING. COUNTER TORQUE CROSSBEAM FITTING PLATE WAS FOUND CRACKED. - [SDR 2018FA0000129](https://openairdocs.org/sdr/2018FA0000129.md): Support Fitting · cracked · Apr 3, 2018 · N9379K · Agusta AW119MKII > CRACKED MGB SUPPORT FITTING. WHILE COMPLETING LEONARDO SB 119-087 LEFT HAND COUNTER TORQUE CROSSBEAM FITTING PLATE WAS FOUND CRACKED. - [SDR 8LFA201803200001](https://openairdocs.org/sdr/8LFA201803200001.md): Fitting · cracked · Mar 18, 2018 · N636LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT HAND PLATE FITTING CRACKED. - [SDR 8LFA201800320001](https://openairdocs.org/sdr/8LFA201800320001.md): Fitting · cracked · Jan 26, 2018 · N526LF · Agusta AW119MKII > DURING INSPECTION, FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA20171218001](https://openairdocs.org/sdr/8LFA20171218001.md): Fitting · cracked · Dec 18, 2017 · N656LF · Agusta AW119MKII > DURING INSPECTION, FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR QMLA2017110117123](https://openairdocs.org/sdr/QMLA2017110117123.md): Mount · cracked · Nov 1, 2017 · N354LL · Agusta AW119MKII > DURING MAIN ROTOR TRANSMISSION CHANGE, FOUND THE LT AND RT AIRFRAME TRANSMISSION DECK FITTINGS CRACKED. - [SDR 8LFA20171011001](https://openairdocs.org/sdr/8LFA20171011001.md): Fitting · cracked · Oct 11, 2017 · N576LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA20170907001](https://openairdocs.org/sdr/8LFA20170907001.md): Fitting · cracked · Sep 7, 2017 · N556LF · Agusta AW119MKII > DURING INSPECTION, FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA20170901001](https://openairdocs.org/sdr/8LFA20170901001.md): Fitting · cracked · Sep 1, 2017 · N546LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED - [SDR 8LFA20170815003](https://openairdocs.org/sdr/8LFA20170815003.md): Fitting · cracked · Aug 11, 2017 · N626LF · Agusta AW119MKII > DURING INSPECTION, FOUND THE MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA20170815002](https://openairdocs.org/sdr/8LFA20170815002.md): Fitting · cracked · Aug 2, 2017 · N756LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA08152017001](https://openairdocs.org/sdr/8LFA08152017001.md): Fitting · cracked · Jul 21, 2017 · N606LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA20170815001](https://openairdocs.org/sdr/8LFA20170815001.md): Fitting · cracked · Jul 19, 2017 · N566LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA20170712001](https://openairdocs.org/sdr/8LFA20170712001.md): Fitting · cracked · Jul 12, 2017 · N726LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT PLATE FITTING CRACKED. - [SDR 8LFA20170712003](https://openairdocs.org/sdr/8LFA20170712003.md): Fitting · cracked · Jun 15, 2017 · N596LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT HAND PLATE FITTING CRACKED. - [SDR 8LFA20170712004](https://openairdocs.org/sdr/8LFA20170712004.md): Fitting · cracked · Jun 13, 2017 · N646LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT HAND PLATE FITTING CRACKED. - [SDR 8LFA20170712002](https://openairdocs.org/sdr/8LFA20170712002.md): Fitting · cracked · May 23, 2017 · N586LF · Agusta AW119MKII > DURING INSPECTION FOUND MAIN TRANSMISSION AFT RIGHT HAND PLATE FITTING CRACKED. - [SDR AC2R2016032901](https://openairdocs.org/sdr/AC2R2016032901.md): Fitting · galled · Mar 7, 2016 · N639MC · Agusta AW139 > WHILE PERFORMING THE MGB BOLT INSPECTION ON THE LT LOWER FITTING, WE REMOVED THE COTTER PIN AND REMOVED THE NUT FROM THE FWD BOLT. WE ENSURED THE BOLT SPUN FREELY BEFORE WE ATTEMPTED TO REMOVE THE BOLT, WHICH IT DID BY HAND. THE BOLT EASILY REMOVED UPWARD UN - [SDR CA160217004](https://openairdocs.org/sdr/CA160217004.md): Spring · debonded · Feb 15, 2016 · Bell 429 > (CAN) DEBONDING BETWEEN INNER MEMBER AND OUTER MEMBER OF ASSY. THE PITCH RESTRAINT SPRING ASSY DID HAVE AN ASB 429-13-10 ON 29 APRIL 2013 ON A LIMITED QUANTITY OF UNITS THAT WERE MFG WITH INADEQUATE ADHESIVE MIX RATIO BETWEEN THE TUBE AND THE HOUSING. THIS CO - [SDR CA160217001](https://openairdocs.org/sdr/CA160217001.md): Spring · debonded · Feb 15, 2016 · Bell 429 > (CAN) DEBONDING BETWEEN INNER MEMBER AND OUTER MEMBER OF ASSY. THE PITCH RESTRAINT SPRING ASSY DID HAVE AN ASB 429-13-10 ON 29 APRIL 2013 ON A LIMITED QUANTITY OF UNITS THAT WERE MANUFACTURED WITH INADEQUATE ADHESIVE MIX RATIO BETWEEN THE TUBE AND THE HOUSING - [SDR CA160215012](https://openairdocs.org/sdr/CA160215012.md): Spring · debonded · Feb 13, 2016 · Bell 429 > (CAN) DEBONDING BETWEEN INNER MEMBER AND OUTER MEMBER OF ASSY. THE PITCH RESTRAINT SPRING ASSY DID HAVE AN ASB 429-13-10 ON 29 APRIL 2013 ON A LIMITED QTY OF UNITS THAT WERE MFG WITH INADEQUATE ADHESIVE MIX RATIO BETWEEN THE TUBE AND THE HOUSING. THIS CONDITI - [SDR CA160215011](https://openairdocs.org/sdr/CA160215011.md): Spring · debonded · Feb 13, 2016 · Bell 429 > (CAN) DEBONDING BETWEEN INNER MEMBER AND OUTER MEMBER OF ASSY. THE PITCH RESTRAINT SPRING ASSY DID HAVE AN ASB 429-13-10 ON 29 APRIL 2013 ON A LIMITED QTY OF UNITS THAT WERE MANUFACTURED WITH INADEQUATE ADHESIVE MIX RATIO BETWEEN THE TUBE AND THE HOUSING. THI - [SDR CA160212001](https://openairdocs.org/sdr/CA160212001.md): Restraint · unknown · Feb 8, 2016 · Bell 429 > (CAN) DURING FLIGHT, A "BANG" HAS BEEN HEARD BY BOTH CREW. NO LOST OF FLIGHT OR ENGINE CONTROLS HAS BEEN NOTICED, NO ABNORMAL VIBRATIONS OBSERVED AND NO INDICATION OF ANY PROBLEMS FROM SYS ON DISPLAY UNITS. NO OTHERS OBSERVATIONS FOR THE REST OF FLIGHT AND LA - [SDR CA160128005](https://openairdocs.org/sdr/CA160128005.md): Spring · failed · Jan 21, 2016 · Bell 429 > (CAN) PILOT REPORTED A VIBRATION (ABNORMAL) AND "SHIFTING" FELT IN HOVER AND DURING FLIGHT. A PRECAUTIONARY LANDING WAS CARRIED OUT. PILOTS OBSERVED THAT THE TRANSMISSION WAS RESTING ON "PIN BACK-UP MOUNTS". AN AME WAS DISPATCHED TO INSPECT THE ACFT, A FLIGHT - [SDR CA160128004](https://openairdocs.org/sdr/CA160128004.md): Spring · debonded · Jan 21, 2016 · Bell 429 > (CAN) PILOT REPORTED A VIBRATION, ABNORMAL AND "SHIFTING" FELT IN HOVER AND DURING FLIGHT. A PRECAUTIONARY LANDING WAS CARRIED OUT. PILOTS OBSERVED THAT THE TRANSMISSION WAS RESTING ON "PIN BACK-UP MOUNTS". AN AME WAS DISPATCHED TO INSPECT THE ACFT, A FLIGH - [SDR CA160125017](https://openairdocs.org/sdr/CA160125017.md): Spring · debonded · Jan 21, 2016 · Bell 429 > (CAN) PILOTS NOTED AN INCREASE IN VIBRATION AND A DEGRADE OF RIDE. ALSO TRANSMISSION STOP CONTACT WAS HEARD. THE HELICOPTER LANDED AND REMAINED AT LOCATION. THE CUSTOMER`S MAINTENANCE REPORT FINDING BOTH FORWARD AND AFT PITCH RESTRAINT SPRINGS DEBONDED. - [SDR CA160115008](https://openairdocs.org/sdr/CA160115008.md): Sleeve · broken · Jan 15, 2016 · Skrsky S92A > (CAN) DURING REMOVAL OF MAIN ROTOR GEARBOX, THE FORWARD AND REAR MGB MOUNT BOLTS AND SLEEVE BUSHINGS WERE REMOVED, 3 OF THE 4 SLEEVE BUSHINGS WERE FOUND TO BE COMPLETELY BROKEN, WITH THE 4TH CRACKED APPROXIMATELY 75 PERCENT OF THE CIRCUMFERENCE OF THE BUSHING - [SDR CHIR201511172182](https://openairdocs.org/sdr/CHIR201511172182.md): Bolt · broken · Nov 11, 2015 · N242CH · Boeing 234 > DURING DISASSEMBLY OF COMPONENT, SCUFFING ON BOTH THE SPIRAL BEVEL GEAR AND PINION GEAR WAS NOTED. THE CUSTOMER HAD REPORTED A SINGLE BOLT BROKEN UPON ON-WING TORQUE CHECK INSPECTION AND NO OTHER BOLTS APPEAR CRACKED AFTER DISASSEMBLY. NDT PENDING RESULTS. - [SDR CA140128005](https://openairdocs.org/sdr/CA140128005.md): Mount · leaking · Jan 24, 2014 · Urocop EC135P2 > (CAN) ACFT WAS FLOWN IN AVERAGE TEMPERATURES OF -25 DEGREES C FOR 2.5 HOURS. ACFT SAT ON THE GROUND FOR APPROXIMATELY 20 MIN POWER OFF IN THAT TIME. UPON LANDING AT BASE, IT WAS DISCOVERED THAT THE TRANSMISSION ARIS MOUNT HAS LOST ALL ITS FLUID IN THE FORWAR - [SDR CA131024005](https://openairdocs.org/sdr/CA131024005.md): Mount · failed · Oct 22, 2013 · Urocop EC135P2 > (CAN) PILOT REPORTED AN AIRFRAME VIBRATION IN FLIGHT. AFTER TROUBLESHOOTING OF ALL AIRFRAME VIBRATION DAMPENING SYS AND MAIN ROTOR DYNAMIC BALANCING IT WAS DISCOVERED THAT THE REAR LT ARIS, TRANSMISSION MOUNT, WAS UNSERVICEABLE WITH NO INDICATION OF FAILURE. - [SDR CA130925002](https://openairdocs.org/sdr/CA130925002.md): Nut · cracked · Sep 24, 2013 · Bell 206B > (CAN) CRACKED NUT ON TRANSMISSION DECK MOUNT FITTING, FOUND DURING 100-HR INSPECTION. - [SDR QMLA2013061113078](https://openairdocs.org/sdr/QMLA2013061113078.md): Mount · failed · Jun 11, 2013 · N65UP · Urocop EC135P2 > THE PILOT NOTICED DURING CRUISE FLIGHT THAT THE HELICOPTER DEVELOPED AN UNUSUAL VIBRATION. IMMEDIATELY DIVERTED TO THE CLOSEST AIRPORT. FOUND THE LT AFT MAIN ROTOR GEARBOX MOUNT WAS UNSERVICEABLE DUE TO GLYCOL BEING RELEASED FROM THE BELLOWS. MOUNT WAS REP - [SDR CA130612003](https://openairdocs.org/sdr/CA130612003.md): Mount · damaged · May 31, 2013 · Bell 407 > (CAN) PILOT REPORTED A STRANGE INTERMITTENT VIBRATION. DURING A VISUAL INSPECTION, THERE WERE CONTACT MARKS ON THE LT AFT CORNER MOUNT UP STOP/SAFETY WASHER. UPON INSPECTION WITH THE CORNER MOUNT LIFT TOOL, THE LT AFT CORNER MOUNT WAS FOUND SEPARATED. ALL 4 - [SDR QMLA2012062912108](https://openairdocs.org/sdr/QMLA2012062912108.md): Stop · cracked · Jun 29, 2012 · N230AM · Urocop EC135P2 > LEFT AFT ARIS MOUNT EMERGENCY STOP HAS CRACK APPROX 150 DEGREES OF CIRCUMFERENCE APPROX.5" BELOW TOP SURFACE. - [SDR QMLA2012050112072](https://openairdocs.org/sdr/QMLA2012050112072.md): Bar · damaged · May 1, 2012 · N115LN · Snias AS350B2 > DURING PREFLIGHT INSPECTION, NOTICE LT FWD MGB SUPPORT BAR EXTREMELY EASY TO TWIST AND HAD A POPPING SOUND WHEN CHECKING BEARING PLAY. INSPECTED THE OTHER SUPPORT BARS AND FOUND THE RT FWD SUPPORT BAR LOWER CRIMPED COLLAR SHOWED MARKING THAT LOOKED LIKE IT HA - [SDR ALGA2012032601](https://openairdocs.org/sdr/ALGA2012032601.md): Mount · corroded · Mar 26, 2012 · N577AL · Bell 407 > CORROSION AT TRANSMISSION MOUNTS BEYOND LIMITS. - [SDR ALGA20122281201](https://openairdocs.org/sdr/ALGA20122281201.md): Support Case · corroded · Feb 28, 2012 · N9YBOB · Bell 412EP > TRANSMISSION SUPPORT CASE CORRODED BEYOND LIMITS. - [SDR CA120208002](https://openairdocs.org/sdr/CA120208002.md): Mount · failed · Feb 6, 2012 · Urocop EC135P2 > (CAN) ACFT WAS REPORTED ROUGH IN FLIGHT 35 HRS AFTER MAINTENANCE INSPECTION. DYNAMIC BALANCE EQUIPMENT WAS INSTALLED AND ACFT WAS FOUND TO BE WITHIN LIMITS BUT FURTHER ADJUSTMENTS COULD BE CARRIED OUT. OVER THE 7 ACFT RUNS, THE ACFT WAS NOTICEABLE ROUGHER. T - [SDR ALGA070711687AL](https://openairdocs.org/sdr/ALGA070711687AL.md): Mount · corroded · Jul 7, 2011 · N687AL · Bell 407 > TRANSMISSION DECK, TRANSMISSION PYLON MOUNT POINT CORRISION, RT FWD - [SDR ALGA070611687AL](https://openairdocs.org/sdr/ALGA070611687AL.md): Mount · corroded · Jul 6, 2011 · N687AL · Bell 407 > TRANSMISSION DECK. TRANSMISSION PYLON MOUNT POINT CORRODED. - [SDR P4YA2010071500001](https://openairdocs.org/sdr/P4YA2010071500001.md): Mount · cracked · Jul 15, 2010 · N103WF · Skrsky S61N > LT FWD TRANSMISSION MOUNT FITTING WAS FOUND TO BE CRACKED 2" AT STA 243. AREA WAS PREVIOUSLY REPAIRED AND DOUBLERS WERE REMOVED FOR INSPECTION. REPAIR IS IN PROGRESS AT THIS TIME. Next page: https://openairdocs.org/jasc/6330/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 = '6330' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/jasc/6330/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.