# JASC 6500: Tail Rotor Drive System - Type: JASC system/component code (FAA) - ATA chapter: 65 Tail Rotor Drive - Title in the code table: TAIL ROTOR DRIVE SYSTEM - Service difficulty reports: 105 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=58 - Page: https://openairdocs.org/jasc/6500 ## What it covers For general reports of the tail rotor drive system reported with insufficient information to file in a more specific tail rotor drive system. Avoid excessive use of this code if possible. ## Service difficulty reports (105, newest 50) - [SDR 2026FA0000555](https://openairdocs.org/sdr/2026FA0000555), Jul 1, 2026: Robsin R44RAVENII. YOKE. DAMAGED. TAIL ROTOR DRIVE YOKE PN C908-1 REV K LOT 220 LOST A MAGNET THAT PHASES WITH THE HALL EFFECT SENSORS TO PROVIDE MAIN ROT (N786AK) - [SDR QMLA2024062520068](https://openairdocs.org/sdr/QMLA2024062520068), Jun 21, 2024: Bell 407. SERVO. NOISE. LOUD WHINING NOISE COMING FROM ABOVE AND AFT OF THE REAR FORWARD FACING SEATS. IT OCCURRED DURING A CLIMB AT MCP AND 60 (N911AL) - [SDR QR9R2024051000001](https://openairdocs.org/sdr/QR9R2024051000001), May 10, 2024: Bolkms BK117C2. BEARING. SEPARATED. THE RAD ANGULAR BALL BEARING INNER RACE FELL OUT DURING INSPECTION AND PREP FOR INSTALL. - [SDR 2023FA0000810](https://openairdocs.org/sdr/2023FA0000810), Dec 5, 2023: Agusta AW139. BUSHING. WORN. DURING INSPECTION, FOUND TAIL ROTOR SLIDER BUSHING WORN BEYOND ALLOWABLE LIMITS. INSTALLED NEW BUSHING P/N 3G6430L00251, (N383MD) - [SDR 2023FA0000627](https://openairdocs.org/sdr/2023FA0000627), Jun 28, 2023: Hughes 500N. BLADE. UNKNOWN. IN RNGARDS TO THE MD 500N HOLICOPTER, LHLS IS THE SECOND LIMO THAT I HAVE THE SAME ISSUE WITH THE NOTAR FAN BLADE ASSEMB (N103CG) - [SDR 2023FA0000626](https://openairdocs.org/sdr/2023FA0000626), Jun 28, 2023: Hughes 500N. BLADE. UNKNOWN. THO 1.1O500N HERICOPLER HAS A 13 BLADED ANTI IOFQUO FAN (NOTAR FAN) INSTEAD DO TRND1TLONAL LAIL ROLET ASSY. THE NOTAR FA (N520PD) - [SDR QR9R2023062300002](https://openairdocs.org/sdr/QR9R2023062300002), Jun 23, 2023: Bolkms BK117C2. GEARBOX. MAKING METAL. DURING INSP A010, MAINTENANCE FOUND IGB MAGNETIC CHIP DETECTOR TO HAVE METALLIC CHIPS IN THE OIL COMPOSED OF CRITICLAL M - [SDR 2022FA0000512](https://openairdocs.org/sdr/2022FA0000512), Sep 16, 2022: Urocop EC135P2. CAP. CRACKED. TAIL ROTOR HUB CAP HAS A CRACK ORIGINATING AT ONE OF THE HUB CAP CLAMP BOLTS AND TRAVELING OUTBOARD TO THE EDGE OF THE S (N435LL) - [SDR QR9R20220505002](https://openairdocs.org/sdr/QR9R20220505002), May 5, 2022: Bolkms BK117C2. BEARING. RATCHETING. DURING INSTALLATION, MAINTENANCE DETECTED THE SLIDING SLEEVE ANGULAR BALL BEARING TO BE ROUGH AND RATCHETING. PART WAS R - [SDR QR9R20220505001](https://openairdocs.org/sdr/QR9R20220505001), May 5, 2022: Bolkms BK117C2. BEARING. RATCHETING. DURING INSTALLATION, MAINTENANCE DETECTED THE SLIDING SLEEVE ANGULAR BALL BEARING TO BE ROUGH AND RATCHETING. PART WAS R - [SDR QMLA2021855320041](https://openairdocs.org/sdr/QMLA2021855320041), Aug 9, 2021: Snias AS350B3. ELASTOMER. CRACKED. TAIL ROTOR PITCH CONTROL LINKS (P/N LB6-1231-3-2) ARE IN HIGH DEMAND DUE TO A VERY SHORT LIFE SPAN BEFORE THE LAMINATED (N491LG) - [SDR QR9R20210624001](https://openairdocs.org/sdr/QR9R20210624001), Jun 24, 2021: Bolkms BK117C2. ACTUATOR. LEAKING. EXCESSIVE PLAY DETECTED AT THE TAIL ROTOR HYDRAULIC/YAW SEMA. SUBSEQUENT TROUBLESHOOTING REVEALED T/R ACTUATOR LEAKING A (N547AE) - [SDR CA180510009](https://openairdocs.org/sdr/CA180510009), May 10, 2018: Bell 429. BRACKET. CRACKED. (CAN) DURING VISUAL INSPECTION, THE BRACKET P/N: 429-035-704-125, WHICH IS THE NUT PLATE HOLDER OF THE ATTACHMENT OF THE - [SDR QMLA2017100717103](https://openairdocs.org/sdr/QMLA2017100717103), Oct 7, 2017: Bell 407. BEARING. DAMAGED. AFTER LANDING AND DURING ENGINE SHUT DOWN THERE WAS A PRONOUNCED VIBRATION. AFTER SHUT DOWN THERE WAS ENGINE OIL RUNNING (N712GA) - [SDR QMLA2017100717100](https://openairdocs.org/sdr/QMLA2017100717100), Oct 7, 2017: Bell 407. OIL TANK. CRACKED. AFTER LANDING AND DURING ENGINE SHUT DOWN, THERE WAS A PRONOUNCED VIBRATION. AFTER SHUT DOWN THERE WAS ENGINE OIL RUNNIN (N712GA) - [SDR CA160126003](https://openairdocs.org/sdr/CA160126003), Jan 25, 2016: Bell 212. HANGER ASSY. CRACKED. (CAN) CRACKS WERE FOUND ON EACH BOLT HOLE THAT CONNECTS THE TAIL ROTOR DRIVESHAFT HANGER BEARING AND COUPLING ASSY, PN 2 - [SDR CA150918001](https://openairdocs.org/sdr/CA150918001), Sep 17, 2015: Bell 407. CAP. CRACKED. (CAN) FREEWHEEL O/H CAP REQUIRED FPI IAW O/H CAP SENT TO AMO 45-13 CAP FAILED FPI, CRACK INDICATION. - [SDR CA150616001](https://openairdocs.org/sdr/CA150616001), Jun 4, 2015: Bell 430. BEARING SUPPORT. CRACKED. (CAN) THE FOLLOWING HAS BEEN REPORTED. POST A SEAL CHANGE ON THE ACFT, WHEN ROTATING THE ROTOR, THE ENGINEER HEARD A UNU - [SDR H44R201505040001](https://openairdocs.org/sdr/H44R201505040001), Apr 21, 2015: Bell 407. LOCKWASHER. CRACKED. LOCK WASHER FOR THE AFT OIL COOLER BLOWER BEARING CRACKED ALLOWING THE RETENTION NUT TO LOOSE TORQUE, THE LOSS OF TORQUE - [SDR 9EKA20150313012](https://openairdocs.org/sdr/9EKA20150313012), Mar 13, 2015: Aerosp AS355*. SPIDER. BROKEN. LOST RT PEDAL IN FLIGHT. PERFORMED RUN ON LANDING. (N814EH) - [SDR CA150225006](https://openairdocs.org/sdr/CA150225006), Feb 23, 2015: Bell 205A1. SHIELD. LEAKING. (CAN) DURING DAILY INSPECTION, NOTICED THAT THE HANGER BEARING ASSEMBLY GREASE SHIELD WAS LEAKING. UNIT WAS REPLACED WIT - [SDR CA141008014](https://openairdocs.org/sdr/CA141008014), Oct 8, 2014: Snias AS350*. TORQUE TUBE. OUT OF TOLERANCE. (CAN) ONE BORE OF HIGH TOLERANCE FLIGHT CONTROL LEVER FOUND TO BE OUT OF TOLERANCE AT NEW. MEASURED AT 8.6 MM, SHOULD BE - [SDR QMLA2013042213057](https://openairdocs.org/sdr/QMLA2013042213057), Apr 22, 2013: Bell 407. DISC PACK. CRACKED. AIRWORTHINESS INSPECTION FOUND TAIL ROTOR AFT SHORT SHAFT COUPLING DISC PACK CRACKED. (N408AM) - [SDR E3MA201210160001](https://openairdocs.org/sdr/E3MA201210160001), Oct 15, 2012: Urocop EC135T2. STATOR. CRACKED. DURING A ROUTINE AIRFRAME INSPECTION, A LONGITUDIONAL CRACK WAS DISCOVERED ON THE TOP SIDE OF A TAIL ROTOR STATOR. (N527ME) - [SDR ALGA2012061202](https://openairdocs.org/sdr/ALGA2012061202), Jun 12, 2012: Bell 412. FLANGE. CORRODED. FLANGE, CORROSION BEYOND LIMITS. (N9YBOB) - [SDR ALGA2012042603](https://openairdocs.org/sdr/ALGA2012042603), Apr 26, 2012: Bell 407. BLOWER. DAMAGED. DURING COURSE OF REPAIR TO OIL COOLER BLOWER ASSY, FOUND AND REPLACED ONE SHAFT (407-040-320-103, SN A-3283), BEARING JO (N404AL) - [SDR CA120328006](https://openairdocs.org/sdr/CA120328006), Mar 27, 2012: Bell 206L1. WASHER. WORN. (CAN) DURING 100-HR PERIODIC INSPECTION IT WAS NOTICED THAT THE TAIL ROTOR BELLCRANK AT THE END OF THE TAILBOOM WHICH AC - [SDR CA110815017](https://openairdocs.org/sdr/CA110815017), Aug 8, 2011: Bell 212. CONTROL TUBE. DAMAGED. (CAN) THIS CONTROL TUBE WAS REMOVED FROM THE AIRCRAFT AND AN INSPECTION WAS BEING CONDUCTED IN ACCORDANCE WITH B 212 MM - [SDR 2011FA0000183](https://openairdocs.org/sdr/2011FA0000183), Mar 18, 2011: Hughes 269C. TAIL ROTOR. DAMAGED. ODOR OF BURNING LUBRICANT, EXCESSIVE VIBRATION, FORCED A SUCCESSFUL OFF AIRPORT LANDING. FOUND AFT "H" FRAME BEARING, PN (N958CP) - [SDR AC2A0CF02162011](https://openairdocs.org/sdr/AC2A0CF02162011), Feb 16, 2011: Bell 430. SUPPORT. CRACKED. ON FINAL APPROACH TO HELIPORT, A MODERATE VIBRATION WAS FELT THOUGH THE PEDALS AND AIRFRAME. THE HELICOPTER WAS LANDED A (N430CF) - [SDR CA101105006](https://openairdocs.org/sdr/CA101105006), Nov 2, 2010: Hughes 369D. SWASHPLATE. SHEARED. (CAN) INSPECTION FOUND DRIVE SPLINES SHEARED OFF. HELICOPTER HAS NO HISTORY OF TAIL ROTOR STRIKE. INVESTIGATION INCLUDIN - [SDR CA090702013](https://openairdocs.org/sdr/CA090702013), Jul 1, 2009: Bell 205A1. FITTING. CRACKED. DURING A POST FLIGHT INSP, THE TAIL ROTOR DRIVE FITTING WAS FOUND CRACKED. TIME ON THE FITTING IS UNKNOWN. CRACK WAS FOU - [SDR CA090716009](https://openairdocs.org/sdr/CA090716009), Jun 10, 2009: Snias AS350B2. FLEX COUPLING. CRACKED. PERFORMING A 30 HR INSP, A VISUAL INSP OF THE FWD TRANSMISSION DRIVE COUPLING, A CRACKED FLEX COUPLING WAS FOUND. - [SDR CA081125005](https://openairdocs.org/sdr/CA081125005), Nov 24, 2008: Bell 206B. WASHER. CRACKED. (CAN) THE VERTICAL FIN WAS REMOVED TO FACILITATE SEAL REPLACEMENT OF THE PITCH CHANGE MECHANISM. THE RADIUS WASHERS THAT - [SDR 2008FA0000890](https://openairdocs.org/sdr/2008FA0000890), Nov 19, 2008: Bolkms BO105LSA3. BEARING. CRACKED. MAIN TRANSMISSION WAS DELIVERED FOR O/H. THERE WAS NO NOTICE ABOUT AN INCIDENT OR A CHIP WARNING. CHIP DETECTOR AND OIL (N315LS) - [SDR 2008FA0000068](https://openairdocs.org/sdr/2008FA0000068), Jan 30, 2008: SHAFT. CRACKED. ONE PIECE TRANSVERSE CRACK AROUND THE AREA OF PART THAT HAD LONGITUDINAL INDICATIONS (ORIGIN UNKNOWN BUT POSSIBLY RELATE - [SDR 2007FA0000113](https://openairdocs.org/sdr/2007FA0000113), Feb 5, 2007: Amtr EXEC162F. V-BELT. BROKEN. V BELT PREMATURELY FAILED. THIS IS A 250 HOUR CHANGE OUT PART. (N113JD) - [SDR AC2A113672](https://openairdocs.org/sdr/AC2A113672), Jan 20, 2007: Skrsky S76A. COUPLING. CRACKED. COUPLING WAS FOUND CRACKED ON 110 HR, AIRFRAME INSPECTION. (N5447C) - [SDR AC2A112006](https://openairdocs.org/sdr/AC2A112006), Oct 31, 2006: Agusta AB139. COUPLING. WORN. GROOVE WORN IN SHANK, REPLACED COUPLING. (N139CW) - [SDR AC2A110338](https://openairdocs.org/sdr/AC2A110338), Jul 19, 2006: Skrsky S76A. FLEX COUPLING. CRACKED. DISCOVERED CRACKED COUPLING DURING 50 HOUR INSPECTION. INSTALLED NEW COUPLING. (N5447C) - [SDR KBM2006F00159](https://openairdocs.org/sdr/KBM2006F00159), Apr 11, 2006: Snias AS350B2. BALL END. WORN. BALL END WORN, REMOVED AND REPLACED. (K) (N884SH) - [SDR 2003FA0001118](https://openairdocs.org/sdr/2003FA0001118), Oct 17, 2003: Agusta A109. BEARING. FAILED. DURING ROUTINE DAILY INSPECTION OF HELICOPTER USED IN EMS, MECHANIC NOTICED NR 5 TAIL ROTOR BEARING GREASE SEAL HAD SEPA (N25RX) - [SDR BAQA086455](https://openairdocs.org/sdr/BAQA086455), May 19, 2003: Bolkms BK117B2. ACTUATOR. MALFUNCTIONED. CAUSING SEVERE KICKING EVEN WITH YAW-CSAS DISENGAGED. SEALS LEAKING. REPLACED WITH SERVICEABLE UNIT. (N1174U) - [SDR AC2A084144](https://openairdocs.org/sdr/AC2A084144), Feb 7, 2003: Bell 430. RESTRAINT. DEBONDED. SHEAR RESTRAINT IS DISBONDED. PIN IS SEPARATED FROM RUBBER. REPLACED SHEAR RESTRAINT. (N430CH) - [SDR CA031210009](https://openairdocs.org/sdr/CA031210009), Jan 29, 2003: Hughes 369D. HOUSING. CRACKED. (CAN) AT REMOVAL OF TRANSMISSION FROM AIRFRAME A SUSPECTED CRACK IN THE T/R O/P COVER AT THE OIL PRESSURE SENDING UNIT W - [SDR HEEA080447](https://openairdocs.org/sdr/HEEA080447), Jul 9, 2002: Snias AS350B. BEARING. WORN. TAIL ROTOR LAMINATED HINGE BEARING WORN. (N970AE) - [SDR 2002FA0000628](https://openairdocs.org/sdr/2002FA0000628), Apr 8, 2002: Amtr ROTORWAYEXEC. BELT. BROKEN. CENTER TAIL ROTOR BELT FAILED RESULTING IN NO TAIL ROTOR CONTROL. BELT LIKELY FAILED DUE TO IMPROPER BELT ROUTING THROUG (N21901) - [SDR CA011130006](https://openairdocs.org/sdr/CA011130006), Nov 24, 2001: Bell 407. BEARING. FAILED. (CAN) WHILE ON 5TH SCENIC TOUR OF DAY, AT 2,500 FT ASL IN QUIET MODE CRUISE, A/C SOUND & VIBRATION LEVEL SUDDENLY CHANGE - [SDR HEEA076358](https://openairdocs.org/sdr/HEEA076358), Oct 3, 2001: Bell 407. DISC PACK. CRACKED. CRACKED. TO BE RETURNED TO BELL HELICOPTER TEXTRON FOR CREDIT AGAINST REPLACEMENT PART PURCHASED. (N407PH) - [SDR HEEA076357](https://openairdocs.org/sdr/HEEA076357), Oct 3, 2001: Bell 407. DISC PACK. CRACKED. FWD COUPLING DISC ON NR 4 T/R SEGMENTED DRIVE SHAFT CRACKED. (N405PH) All 105: https://openairdocs.org/jasc/6500/reports.md ## Other codes in chapter 65 - [JASC 6510](https://openairdocs.org/jasc/6510): Tail Rotor Drive Shaft (1,259 reports) - [JASC 6520](https://openairdocs.org/jasc/6520): Tail Rotor Gearbox (865 reports) - [JASC 6540](https://openairdocs.org/jasc/6540): Tail Rotor Drive Indicating System (22 reports) - [JASC 6597](https://openairdocs.org/jasc/6597): Tail Rotor Drive System Wiring (4 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.