# JASC 6230: Main Rotor Mast/Swashplate - Type: JASC system/component code (FAA) - ATA chapter: 62 Main Rotor - Title in the code table: MAIN ROTOR MAST/SWASHPLATE - Service difficulty reports: 1,271 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=57 - Page: https://openairdocs.org/jasc/6230 ## What it covers The vertical shaft which supports the main rotor head. Typical parts are shaft, bearing, guide, mast, seal, swashplate, etc. ## Service difficulty reports (1,271, newest 50) - [SDR AC2A202603069201](https://openairdocs.org/sdr/AC2A202603069201), Mar 4, 2026: Skrsky S92A. BEARING. UNBONDED. PITCH CONTROL LINK UPPER ROD END ELASTOMER SEPARATED FROM CENTER BUSHING AFTER PICKING UP INTO A HOVER. COMPONENT REMAIN (N927SC) - [SDR 4DSR202504170637](https://openairdocs.org/sdr/4DSR202504170637), Apr 17, 2025: Snias AS350B3. BALL JOINT. SCORED. DURING A SCHEDULED 300HR INSPECTION OF THE M/R SWASHPLATE BALL-JOINT, THE SWASHPLATE GUIDE WAS FOUND TO HAVE SCORING ARO (N6968A) - [SDR EVCA20250307001](https://openairdocs.org/sdr/EVCA20250307001), Mar 6, 2025: Bell 407. PITCH LINK. DEBONDED. BLUE MAIN ROTOR PITCH LINK, UPPER ROD END INSERT DE-BONDED. REMOVED BLUE MAIN ROTOR PITCH LINK PN:406-010-413-139, SN:US (N497AE) - [SDR 2023FA0000839](https://openairdocs.org/sdr/2023FA0000839), Dec 18, 2023: Bolkms BK117C2. ROD END. WORN. VIBRATION FELT IN A HOOVER. FOUND ROD END BEARING WORN ON MAIN ROTOR PITCH LINK. (N240SF) - [SDR AC2A2023050213901](https://openairdocs.org/sdr/AC2A2023050213901), May 1, 2023: Agusta AB139. BOOT. TORN. THE NEW DESIGN SWASHPLATE BOOT P/N 3G6230L01851 SEPARATED AND TORE AFTER 13.3 HOURS OPERATING TIME. BOOT WAS REMOVED AND (N139FW) - [SDR 2023FA0000151](https://openairdocs.org/sdr/2023FA0000151), Mar 22, 2023: Robsin R44. BEARING. ROUGH. FOUND ROUGH FEELING SWASHPLATE BEARING. THIS BEARING HAS A LIMITED LIFE LIMIT, BUT IS NEVER TO BE INSPECTED FOR ROUGHNES (N839RM) - [SDR 2023FA0000162](https://openairdocs.org/sdr/2023FA0000162), Mar 21, 2023: Bolkms BK117C2. GAUGE. DEBONDED. FALSE MAST MOMENT INDICATION (N140SF) - [SDR QMLA2022100720067](https://openairdocs.org/sdr/QMLA2022100720067), Oct 6, 2022: Urocop EC130B4. BUSHING. FAILED. DURING ASSEMBLY OF THE LOWER SCISSOR THE CLEARANCE “J” COULD NOT BE OBTAINED. REF MM REV 16 AMM 62-33-00,4-1 PARA F.2.C. (N151AC) - [SDR 8HBR20221010048](https://openairdocs.org/sdr/8HBR20221010048), Aug 10, 2022: Robsin R22BETA. BEARING. WORN. DURING INSPECTION THE UPPER BEARING ON THE CLUTCH SHAFT APPEARED TO HAVE SHIFTED AFT APPROXIMATELY 1/8", DURING REMOVAL (N8340S) - [SDR 2021FA0000284](https://openairdocs.org/sdr/2021FA0000284), Oct 13, 2021: Bell 205A1. SWASHPLATE. CRACKED. A TECHNICIAN REPORTED THAT DURING HIS DAILY INSPECTION HE FELT SOME "LOOSENESS" IN THE SWASHPLATE THAT HE HAD NOT NOTICE (N205PT) - [SDR 2021FA0000294](https://openairdocs.org/sdr/2021FA0000294), Jul 17, 2021: Snias AS350B3. GUIDE. FAILED. MAIN ROTOR SWASHPLATE GUIDE SHEARED RIVETS AT SUPPORT BASE. (N350HF) - [SDR O4VA2021081200002](https://openairdocs.org/sdr/O4VA2021081200002), Jul 17, 2021: Snias AS350B3. RIVET. SHEARED. MAIN ROTOR SWASHPLATE GUIDE HAD SHEARED RIVETS AT THE SUPPORT BASE. (N350HF) - [SDR AC2A2021052540701](https://openairdocs.org/sdr/AC2A2021052540701), May 23, 2021: Bell 407. MAST. CORRODED. MAST POLE HAS CORROSION AT LOWER CONE SEAT AREA (N417AM) - [SDR 2021FA0000031](https://openairdocs.org/sdr/2021FA0000031), Feb 3, 2021: Snias AS350B3. MAST. CRACKED. DURING THE PERFORMANCE OF AN ANNUAL AIRFRAME INSPECTION AND SUPPLEMENTAL 6 YEAR INSPECTION OF THE MAIN ROTOR MAST. DURIN (N243TB) - [SDR 2GYR20200918911](https://openairdocs.org/sdr/2GYR20200918911), Sep 18, 2020: Bell 206L4. NUT. UNDERTORQUED. WE REMOVED MAST ASSY P/N 206-040-014-107 S/N 52047 TO REPAIR A LEAKING MAST BEARING SEAL. WHEN REMOVAL OF MAST NUT P/N 2 (N911YY) - [SDR AC2A2020091813902](https://openairdocs.org/sdr/AC2A2020091813902), Sep 11, 2020: Agusta AW139. BOOT. DETERIORATED. MAIN ROTOR UPPER SWASHPLATE BOOT IS DETERIORATED, METAL RINGS LOOSE, NO ACCEPT/REJECT CRITERIA PROVIDED BY MANUFACTURE, (N639GG) - [SDR AC2A2020091813901](https://openairdocs.org/sdr/AC2A2020091813901), Sep 7, 2020: Agusta AB139. BOOT. TORN. MAIN ROTOR UPPER SWASHPLATE BOOT TORN, METAL RINGS LOOSE, NO ACCEPT/REJECT CRITERIA PROVIDED BY MANUFACTURER, NO DETAILE (N139FW) - [SDR EVCA201912130001](https://openairdocs.org/sdr/EVCA201912130001), Dec 13, 2019: Bell 206L4. MAST. CORRODED. MAIN ROTOR MAST FOUND TO HAVE CORROSION INTERNALLY DURING 12 MONTH INSPECTION. REMOVED MAIN ROTOR MAST AND REPLACED WITH (N314AE) - [SDR EVCA20191029001](https://openairdocs.org/sdr/EVCA20191029001), Oct 29, 2019: Bell 206L1. MAST. CORRODED. DURING 12 MONTH MAST INSPECTION, CORROSION WAS VISUALLY IDENTIFIED ON THE INSIDE SURFACE OF THE MAST. (N24AE) - [SDR EVCA2019092300000](https://openairdocs.org/sdr/EVCA2019092300000), Sep 23, 2019: Bell 206L1. MAST. CORRODED. CORROSION WITH PITTING FOUND ON THE INSIDE DIAMETER SURFACE OF THE MAIN ROTOR MAST DURING 12 MONTH VISUAL INSPECTION. (N83AE) - [SDR 2020F00046](https://openairdocs.org/sdr/2020F00046), Sep 12, 2019: Urocop EC225LP. SWASHPLATE. DAMAGED. THIS SUBMISSION CORRECTS AND EFFECTIVELY REPLACES A PREVIOUS SUBMISSION ON THIS AIRCRAFT AT THE SAME DATE AND TIME. DURI (N252EV) - [SDR YV3R201908280165](https://openairdocs.org/sdr/YV3R201908280165), Aug 20, 2019: Robsin R22BETAII. ARM. WORN. CUSTOMER REPORTED YOKE HALF ASSEMBLY P/N: A203-8 HAD EXCESSIVE WEAR ON CORD ARM AND BOLT. - [SDR CA190814008](https://openairdocs.org/sdr/CA190814008), Jul 31, 2019: Snias AS350B3. BOLT. DAMAGED. (CAN) DURING ROUTINE REPLACEMENT OF SWASHPLATE BEARING IT WAS NOTICED THAT THE BOLTS THAT RETAIN THE EPICYCLIC HAD FAINT - [SDR CHIR20197304049](https://openairdocs.org/sdr/CHIR20197304049), Jun 12, 2019: Boeing 234. RING. CRACKED. SWASHPLATE ASSEMBLY REMOVED FOR SCHEDULED MAINTENANCE AND RETURNED TO RS FOR OVERHAUL ON SWO-047589-19. ROTATING RING FA (N238CH) - [SDR CA190603013](https://openairdocs.org/sdr/CA190603013), Jun 3, 2019: Bell 505. BEARING. LOOSE. (CAN) SWASHPLATE BEARING FOUND LOOSE IN SWASHPLATE. PAINT MARKS SHOWED MOVEMENT. SUPPLIER CONTACTED FOR INVESTIGATION. - [SDR CA190604025](https://openairdocs.org/sdr/CA190604025), May 30, 2019: Urocop EC120B. SWASHPLATE. DAMAGED. (CAN) DURING A 500FH INSPECTION OF THE SWASHPLATE ASSEMBLY, IT WAS NOTED THAT INJECTION OF GREASE INTO THE BALL BEARING - [SDR CA190528009](https://openairdocs.org/sdr/CA190528009), May 28, 2019: Bell 505. BEARING. LOOSE. (CAN) BELL MIRABEL MANUFACTURING REPORTS: SWASHPLATE BEARING FOUND LOOSE IN SWASHPLATE. PAINT MARKS TO VERIFY NON MOVEME - [SDR CA190528008](https://openairdocs.org/sdr/CA190528008), May 28, 2019: Bell 505. BEARING. LOOSE. (CAN) BELL MIRABEL MANUFACTURING REPORTS: SWASHPLATE BEARING FOUND LOOSE IN SWASHPLATE. PAINT MARKS TO VERIFY NON MOVEME - [SDR YV3R2019052400096](https://openairdocs.org/sdr/YV3R2019052400096), May 23, 2019: Robsin R44. BEARING SEAL. UNSERVICEABLE. CUSTOMER REPORTED MAIN ROTOR SWASHPLATE P/N: C017-6 BEARING SEALS ARE UNSERVICEABLE. - [SDR CA190507001](https://openairdocs.org/sdr/CA190507001), May 5, 2019: Bell 407. BUSHING. CRACKED. (CAN) IN BELL FACILITY: AIRCRAFT COMMERCIAL UNDER EXPERIMENTAL PERMIT: DURING CLEARANCE CHECK, WITH THE HYDRAULIC SYSTEM - [SDR CA190903013](https://openairdocs.org/sdr/CA190903013), Apr 23, 2019: Snias AS350B3. MAST. CORRODED. (CAN) DURING 24 MONTH 600 HOUR INSPECTION ENGINEER WAS PLACING TAPE ON UPPER FLANGE TO KEEP DUST ETC FROM GOING INSIDE M - [SDR CA190416007](https://openairdocs.org/sdr/CA190416007), Apr 14, 2019: Bell 505. BEARING. LOOSE. (CAN) IT WAS REPORTED TO BELL:DURING REMOVAL OF SWASHPLATE ASSY TO REPLACE LEAKING UPPER GREASE SEAL 206-010-400-101, TE - [SDR CA190306010](https://openairdocs.org/sdr/CA190306010), Mar 6, 2019: Bell 505. BEARING. ROTATED. (CAN) SWASHPLATE INNER RING (CYCLIC) LEFT HAND SPHERICAL BEARING FOUND MOVING IN HOUSING- STAKING WORN. THIS IS SECOND O - [SDR DXMR20200219163](https://openairdocs.org/sdr/DXMR20200219163), Mar 4, 2019: Hughes 369FF. BEARING. SEIZED. DURING EXTREME COLD WEATHER, SWASHPLATE UNIBALL SEIZED ON M/R DRIVESHAFT CAUSING STIFF COLLECTIVE FORCES. (N557CP) - [SDR RV1R2019020400001](https://openairdocs.org/sdr/RV1R2019020400001), Jan 29, 2019: Bell 505. BEARING. UNSECURE. DURING INSPECTION IT WAS DISCOVERED THAT ALL 4 SPHERICAL SWASHPLATE BEARINGS 2EA IN THE FIXED RING AND 2EA IN THE ROTATI (N505RS) - [SDR 2019FA0000028](https://openairdocs.org/sdr/2019FA0000028), Jan 29, 2019: Hughes 369D. UNIBALL. DEFECTIVE. HELICOPTER LEFT A WARM HANGER ON A COLD MORNING , FLEW OUT TO JOBSITE, SAT FOR ABOUT 30 MINS IN 11 DEGREES F WEATHER, AN (N502MM) - [SDR 9EKA20181207005](https://openairdocs.org/sdr/9EKA20181207005), Dec 6, 2018: Bell 214ST. MAST. CRACKED. DURING WEEKLY INSPECTION, FOUND 1 EACH BROKEN MAST TO TRANSMISSION MOUNT STUD BROKEN. NOT STILL ATTACHED TO BROKEN STUD (N512EV) - [SDR 2018FA0000454](https://openairdocs.org/sdr/2018FA0000454), Aug 25, 2018: Bell 212. SUPPORT. FAILED. THE SWASHPLATE SUPPORT FAILED 83 HOURS PRIOR TO ITS SCHEDULED RETIREMENT LIFE OF 1000 FLIGHT HOURS, FOR UNKNOWN REASONS. (N512TA) - [SDR CA180822004](https://openairdocs.org/sdr/CA180822004), Aug 20, 2018: Bell 505. BEARING. ROTATED. (CAN) MAINTENANCE ON AIRCRAFT THAT REQUIRED DISCONNECTING THE LEFT AND RIGHT CYCLIC INPUTS TO THE SWASHPLATE TO VERIFY T - [SDR 2018FA0000537](https://openairdocs.org/sdr/2018FA0000537), Jul 24, 2018: Bell UH1H. SUPPORT. INFLT SEPARATION. THE SWASHPLATE SUPPORT FAILED AT 1916 HOURS IN SERVICE, PRIOR TO ITS SCHEDULED RETIREMENT LIFE OF 3600 HOURS, FOR UNKNOW (N107CH) - [SDR 8LFA20180619001](https://openairdocs.org/sdr/8LFA20180619001), Jun 19, 2018: Agusta AW119MKII. SWASHPLATE. CRACKED. DURING 2400 HOUR INSPECTION, NDT (FLUORESCENT PENETRATION) PERFORMED ON SWASH-PLATE FIXED ASSEMBLY WHERE INDICATIONS OF (N586LF) - [SDR CA180530013](https://openairdocs.org/sdr/CA180530013), May 17, 2018: Bell 505. BEARING. LOOSE. (CAN) THE FOLLOWING WAS REPORTED TO BELL: ONE OF THE SPHERICAL BEARINGS WAS LOOSE AND HAD SPUN IN THE HORN OF THE INNER - [SDR QMLA2017040417033](https://openairdocs.org/sdr/QMLA2017040417033), Apr 4, 2017: Snias AS350B2. MAST. LOOSE. DURING TBO REMOVAL OF EPICYCLIC GEAR FOUND THAT THE 6 MAST?EPICYCLIC BOLTS (P/N 350A37-1024-20) WHERE NOT TORQUED. CONTA (N350GR) - [SDR ULXR201612220001](https://openairdocs.org/sdr/ULXR201612220001), Dec 14, 2016: Agusta AW139. BEARING. DISLODGED. MAIN ROTOR SWASHPLATE DUPLEX BEARING LOWER SEAL DISPLACED IN SERVICE CAUSING DAMAGE TO STATIONARY SWASHPLATE RING. (N305FD) - [SDR 2017F00005](https://openairdocs.org/sdr/2017F00005), Dec 8, 2016: Bell 407. NUT. STUCK. MAIN ROTOR MAST NUT FOUND SEIZED TO MAST. ULTIMATELY REQUIRED APPROX. 2000 FT-LBS TORQUE TO REMOVE. (N293AM) - [SDR 9EKA20161122020](https://openairdocs.org/sdr/9EKA20161122020), Nov 22, 2016: Snias SA330J. BEARING. FAILED. THE PILOTS REPORTED THE TORQUE FLUCTUATING. SHUT DOWN OF THE A/C TO TROUBLESHOOT THE UPPER PORTION OF THE SWASHPLATE ASS (N1624S) - [SDR CHIR201611232643](https://openairdocs.org/sdr/CHIR201611232643), Nov 22, 2016: Boeing 234. RETAINER. CRACKED. DURING THE FLUORESCENT PENETRANT INSPECTION OF THE AFT SWASHPLATE ASSY, THE UPPER RETAINER WAS FOUND TO HAVE FOUR CRACKS - [SDR 2016FA0000558](https://openairdocs.org/sdr/2016FA0000558), Nov 9, 2016: Hughes 269C1. MAST. CORRODED. MAIN ROTOR ASSEMBLY, CORROSION AROUND MAIN ROTOR THRUST BEARING RETAINER, AND SCISSOR MOUNTING LUG. - [SDR CHIR092120162577](https://openairdocs.org/sdr/CHIR092120162577), Sep 21, 2016: Boeing 234. RETAINER. CRACKED. DURING FLUORESCENT PENETRANT INSPECTION OF SWASHPLATE ASSY, UPPER RETAINER FOUND TO HAVE 5 CRACKS. MECHANICAL TESTING, M (N238CH) - [SDR CHIR201604082347](https://openairdocs.org/sdr/CHIR201604082347), Apr 6, 2016: Boeing 234. RING. CRACKED. DURING A VISUAL INSPECTION FOR O/H OF THE UPPER RING ASSY, A HAIR LINE CRACK WAS NOTICED ON THE MAIN BEARING RETENTION S All 1,271: https://openairdocs.org/jasc/6230/reports.md ## Other codes in chapter 62 - [JASC 6200](https://openairdocs.org/jasc/6200): Main Rotor System (168 reports) - [JASC 6210](https://openairdocs.org/jasc/6210): Main Rotor Blades (1,561 reports) - [JASC 6220](https://openairdocs.org/jasc/6220): Main Rotor Head (2,052 reports) - [JASC 6240](https://openairdocs.org/jasc/6240): Main Rotor Indicating System (677 reports) - [JASC 6297](https://openairdocs.org/jasc/6297): Main Rotor System Wiring (8 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.