# JASC 6400: Tail Rotor System - Type: JASC system/component code (FAA) - ATA chapter: 64 Tail Rotor - Title in the code table: TAIL ROTOR SYSTEM - Service difficulty reports: 95 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=58 - Page: https://openairdocs.org/jasc/6400 ## What it covers For general reports of the rotorcraft tail rotor system reported with insufficient information to file in a more specific tail rotor system. Avoid excessive use of this code if possible. ## Service difficulty reports (95, newest 50) - [SDR M3XA2025061109002](https://openairdocs.org/sdr/M3XA2025061109002), Jun 9, 2025: Urocop EC135P2. UNKNOWN. VIBRATION. PILOT PERFORMED A PRECAUTIONARY LANDING IN VACANT FIELD IN CARTHAGE, MS FOR IN STRAIGHT AND LEVEL FLIGHT AT 2500 MSL AT (N836CS) - [SDR HDNA2024062802](https://openairdocs.org/sdr/HDNA2024062802), Jun 23, 2024: Bolkms BK117C2. ARM. CRACKED. PLAY WAS NOTICED IN TAIL ROTOR SYSTEM DURING A PREFLIGHT INSPECTION. INSPECTION OF SYSTEM FOUND A CRACK IN THE ARM OF TH (N145NC) - [SDR QMLA2024040920036](https://openairdocs.org/sdr/QMLA2024040920036), Apr 9, 2024: Urocop EC135T2. BLADE. FAILED. TWO EC135T2+ TAIL ROTOR BLADES HAVE CRACKED AND/OR SHOWN PITTING VISIBLE TO THE NAKED EYE IN THE BLADE ROOT WITHIN THE L (N955AL) - [SDR 2023FA0000790](https://openairdocs.org/sdr/2023FA0000790), Nov 19, 2023: Bolkms BK117C2. UNKNOWN. UNKNOWN. DURING CRUISE FLIGHT, THE T/R CHIP LIGHT ILLUMINATED. THIS AIRCRAFT HAS NO FUZZ BURNER FOR THE TAIL ROTOR GEARBOXES. NOR (N145SU) - [SDR QMLA2023091320071](https://openairdocs.org/sdr/QMLA2023091320071), Sep 13, 2023: Bell 407. SOLENOID. UNSERVICEABLE. PEDAL STOP LIGHT ILLUMINATED IN FLIGHT, ONCE CONFIGURED THE MANUAL RELEASE WAS ENGAGED AND LANDED WITHOUT ANY FURTHER IN (N458AM) - [SDR QR9R2023031700001](https://openairdocs.org/sdr/QR9R2023031700001), Mar 17, 2023: Bolkms BK117C2. UNKNOWN. FAILED INSP. PART RECEIVED NEW FROM SUPPLY. T/R LAMINATED PILE ASSY FAILED FEELER GAUGE CHECK. MEASURED GAP OVER .008". - [SDR 2NVA202210310003](https://openairdocs.org/sdr/2NVA202210310003), Oct 25, 2022: Snias AS350B2. SPAR. CRACKED. PILOT REPORTED NOISE FROM TAIL ROTOR DURING ROUTINE PREFLIGHT CHECK. REMOVAL AND INSPECTION OF TAIL ROTOR ASSEMBLY REVEA (N746RH) - [SDR QR9R20220809002](https://openairdocs.org/sdr/QR9R20220809002), Aug 9, 2022: Bolkms BK117C2. TAIL ROTOR. OUT OF LIMITS. AN INSPECTION OF THE LAMINATED STRAP ASSEMBLY REVEALED .007"+ CLEARANCE IN BETWEEN INDIVIDUAL LAMINATES WHICH EXCEEDS TH - [SDR QMLA2022033120022](https://openairdocs.org/sdr/QMLA2022033120022), Mar 31, 2022: Bell 429. CHIP DETECTOR. USED. THIS WAS A HOSPITAL TRANSFER FROM CRESTON, IA TO DES MOINES, IA. ON THE FIRST LEG BETWEEN KOXV AND CRESTON APPROXIMATELY (N911KX) - [SDR QMLA2018121218132](https://openairdocs.org/sdr/QMLA2018121218132), Dec 12, 2018: Agusta A109E. ACTUATOR. UNSERVICEABLE. UNCOMMANDED YAW INPUTS DURING FLIGHT. (N7UC) - [SDR 8HBR20180611015](https://openairdocs.org/sdr/8HBR20180611015), May 3, 2018: Robsin R22. BEARING. WORN. PITCH CONTROL BEARING WORN AT HALF LIFE OF LIFE-LIMIT. (N7155W) - [SDR QMLA2017092517096](https://openairdocs.org/sdr/QMLA2017092517096), Sep 25, 2017: Snias AS350B2. TAIL ROTOR. CRACKED. DURING THE TAIL ROTOR 600HR/24 MONTH AIRFRAME INSPECTION (A 1660) FOUND 2EA "SPLITS" ON SLOPE. NOTE: ONLY 1 DAMAGE AREA (N41299) - [SDR AC2R2016070601](https://openairdocs.org/sdr/AC2R2016070601), Jul 5, 2016: Agusta AW139. LOCK NUT. DEFECTIVE. THIS REPORT IS FOR A LOCKNUT WITH A LOOSE LINER. 6 TO 8 OF THE NUTS IN THIS BATCH HAD LINERS THAT BECAME LOOSE WHEN TORQ (N139CN) - [SDR QMLA2013071613100](https://openairdocs.org/sdr/QMLA2013071613100), Jul 16, 2013: Urocop EC135P2. PIVOT. CORRODED. THE PILOT REPORTED THAT ON FINAL APPROACH, THE LT TAIL ROTOR PEDAL BECAME STUCK, AND THE ACFT BEGAN FLYING TO THE RIGHT. (N433CM) - [SDR CA130508014](https://openairdocs.org/sdr/CA130508014), May 3, 2013: Doug MD900. SCREW. MISSING. (CAN) FOD DAMAGE TO NOTAR FAN. STATOR BLADE RETAINER SCREW FOUND MISSING. - [SDR CA121010010](https://openairdocs.org/sdr/CA121010010), Oct 10, 2012: Bell 206B. PIN. FAILED. (CAN) WHILE DOING PREFLIGHT CHECKS FOR A TRAINING FLIGHT WITH DUAL PILOTS AND DUAL CONTROLS INSTALLED, TRAINING PILOT WA - [SDR ALGA2012061201](https://openairdocs.org/sdr/ALGA2012061201), Jun 12, 2012: Bell 407. ROTOR. DAMAGED. ONE TRUNNION, PN 407-312-100-101, SN LKFS3425, HAS ELASTOMERIC EXTRUSION, FOUR WORN BEARINGS, PN 406-312-100-101 AND TWO (N687AL) - [SDR 2009FA0000920](https://openairdocs.org/sdr/2009FA0000920), Sep 29, 2009: Hughes 269C. GEARBOX. LEAKING. PILOT NOTE THE TAIL ROTOR GEARBOX WAS LEAKING. GEARBOX WAS CLEANED WITH SOLVENT AND AIR DRIED AND THEN GROUND RAN FOR 2- (N656RB) - [SDR QMLA052309018](https://openairdocs.org/sdr/QMLA052309018), May 23, 2009: Bolkms BK117C1. CHIP DETECTOR. ILLUMINATED. IN CRUISE FLIGHT, TO PICK UP A PATIENT AT 2500MSL, ACFT EXPERIENCED A T/R CHIP LIGHT. THE ACFT COMPLETED THE EMERGENCY P (N117NC) - [SDR CA090325007](https://openairdocs.org/sdr/CA090325007), Mar 24, 2009: Skrsky S61N. BEARING. CORRODED. (CAN) NEW BEARING RECIEVED, FOUND TO BE CORRODED AS REMOVED FROM UNOPENED ORIGINAL PACKAGING. - [SDR 2008FA0000337](https://openairdocs.org/sdr/2008FA0000337), Jul 1, 2008: Bell 206L3. ROD. CHAFED. DURING AN INSPECTION THE THE TAIL ROTOR PITCH CONTROL TUBE SLEEVES, WE DISCOVERED THAT BELLCRANK PN 206-001-763-001 HAD (N83WP) - [SDR CA080403004](https://openairdocs.org/sdr/CA080403004), Mar 31, 2008: Bell 412EP. TRUNNION. MISMANUFACTURED. (CAN) MFG WAS ADVISED THAT 14 PCS. OF 212-076-004-101 SERVO ACTUATOR, TAIL ROTOR HAD A MISMANUFACTURED DETAIL. ONE OF TH - [SDR CA071115005](https://openairdocs.org/sdr/CA071115005), Nov 15, 2007: Snias AS350B2. TAIL ROTOR. OUT OF BALANCE. (CAN) UNABLE TO BALANCE T/R WITH OUT LARGE AMOUNTS OF BALANCE WEIGHT. T/R WOULD GO OUT OF BALANCE EVERY 3 TO 4 DAYS. SEN - [SDR 2006FA0000116](https://openairdocs.org/sdr/2006FA0000116), Nov 11, 2005: Snias AS350B2. BELLCRANK. ELONGATED. DURING 500 HOUR INSPECTION AND REMOVAL OF T/R SERVO OVERCENTERING MECHANISM, IT WAS DISCOVERED THAT THE MAIN SUPPORT BOL - [SDR ALGA104923](https://openairdocs.org/sdr/ALGA104923), Jul 22, 2005: Bell 407. PITCH HORN. CORRODED. EXCESSIVE PITTING FROM CORROSION BEYOND LIMITS / INSTALLED 2EA NEW PITCH HORNS BY OVERHAUL SHOP. (N557AL) - [SDR ALGA098887](https://openairdocs.org/sdr/ALGA098887), Dec 8, 2004: Bell 206L1. BEARING. BENT. BENT EXCESSIVLY, UNABLE TO SHIM NEW BEARINGS / REPLACED BLADE (N1067D) - [SDR CA041213005](https://openairdocs.org/sdr/CA041213005), Dec 4, 2004: Snias AS350B2. BUSHING. CRACKED. (CAN) DURING ROUTINE HYDS OFF TRAINING, TAIL ROTOR INPUTS MADE THROUGH TAIL ROTOR PEDALS WERE NOT BEING TRANSFERRED TO T - [SDR TXER097946](https://openairdocs.org/sdr/TXER097946), Oct 17, 2004: Urocop EC155B. FAIRING. CRACKED. TAIL ROTOR FAIRING CRACKED. (N155EW) - [SDR KBM2004F00243](https://openairdocs.org/sdr/KBM2004F00243), Oct 15, 2004: Snias AS350B2. BEARING. WORN. HALF SHELLS, WORN BEYOND LIMITS, REMOVED AND REPLACED. (N313LV) - [SDR TXER100925](https://openairdocs.org/sdr/TXER100925), Aug 30, 2004: Urocop EC120B. TAIL ROTOR. WORN. TAIL ROTOR, OUT OF LIMITS PER 64-21-00,6-9 ZONE D. (N588SC) - [SDR HEEA087161](https://openairdocs.org/sdr/HEEA087161), Jun 9, 2003: Bell 206L3. BEARING. WORN. WORN BEARINGS. SCRAPPED. (N3116L) - [SDR CA030708009](https://openairdocs.org/sdr/CA030708009), May 1, 2003: Bell 212. CONTROL ARM. CHAFED. (CAN) CONTROL TUBE AT PRIOR MAINTENANCE EVENT WAS INSTALLED BACKWARDS (180 DEGREES OUT). TUBE HAD NYLATRON SLEEVES BUT R - [SDR AC2A084868](https://openairdocs.org/sdr/AC2A084868), Feb 24, 2003: Bell 430. BEARING. ROUGH. TAIL ROTOR BEARING IS ROUGH. REPALCED BEARING. (N430CT) - [SDR AC2A084863](https://openairdocs.org/sdr/AC2A084863), Feb 24, 2003: Bell 430. LOCK PLATE. DAMAGED. LOCK PLATE HAD TO BE REPLACED WHEN TAILROTOR WAS REMOVED FOR PROBLEM OF A WORN, RUSTED TRUNNION, AND CRACKED SPLINE ON T (N430CT) - [SDR HEEA079987](https://openairdocs.org/sdr/HEEA079987), Jun 10, 2002: Bell 407. HOUSING. LEAKING. TAIL ROTOR CONTROL HOUSING LEAKING. (N510PH) - [SDR HEEA078367](https://openairdocs.org/sdr/HEEA078367), Mar 22, 2002: Bell 407. MOUNT. DAMAGED. RUBBED IS UNBONDED FROM SHOCK MOUNT. (N457PH) - [SDR HEEA077682](https://openairdocs.org/sdr/HEEA077682), Jan 11, 2002: Snias AS350B. BEARING. SEPARATED. TAIL ROTOR BEARING SEPARATION. (N973AE) - [SDR HEEA077272](https://openairdocs.org/sdr/HEEA077272), Nov 21, 2001: Bell 407. BEARING. FAILED. OIL COOLER SHAFT BEARING FAILED. (N499PH) - [SDR LS1R076728](https://openairdocs.org/sdr/LS1R076728), Oct 22, 2001: Hughes 369D. BELLCRANK. WORN. TAIL ROTOR BELLCRANK EARS WORN AND SPRUNG. (N5027P) - [SDR HEEA076586](https://openairdocs.org/sdr/HEEA076586), Oct 11, 2001: Bell 206L3. BEARING. WORN. BEARINGS WORN AND RUSTED. REPLACED WITH SERVICEABLE PART. (N3108E) - [SDR LS1R074920](https://openairdocs.org/sdr/LS1R074920), Jul 20, 2001: Hughes 369D. LINK. WORN. PART IS WORN EXCESSIVELY. (N5027P) - [SDR LS1R074919](https://openairdocs.org/sdr/LS1R074919), Jul 20, 2001: Hughes 369D. LINK. WORN. PART IS WORN EXCESSIVELY. (N5027P) - [SDR HEEA073576](https://openairdocs.org/sdr/HEEA073576), Jun 18, 2001: Bell 206L3. ROD. WORN. WORN BEARING. REPLACED WITH SERVICEABLE ASSY. (N6160Y) - [SDR HEEA073575](https://openairdocs.org/sdr/HEEA073575), Jun 18, 2001: Bell 206L1. ROD. ROUGH. ROUGH BEARING. REPLACED WITH SERVICEABLE ASSY. (N45RP) - [SDR HEEA073574](https://openairdocs.org/sdr/HEEA073574), Jun 18, 2001: Bell 206L3. ROD. BINDING. BINDING. REPLACED WITH SERVICEABLE ASSY. (N21497) - [SDR HEED065731](https://openairdocs.org/sdr/HEED065731), Dec 15, 1999: Bell 230. BELLCRANK ASSY. WORN. BELLCRANK ASSY HAS WORN BEARING. REPLACED UNIT. (N236X) - [SDR HEED065725](https://openairdocs.org/sdr/HEED065725), Dec 14, 1999: Bell 230. LINK ASSY. WORN. LINK ASSY HAS WORN BEARINGS. (N236X) - [SDR AC2A0000008](https://openairdocs.org/sdr/AC2A0000008), Sep 5, 1999: Bell 430. BUSHING. FROZEN. LOWER AFT MOUNT FOR TAIL ROTOR GUARD LOOSE (BUSHING FROZEN ON BOLT CAUSING WEAR AD PLAY). (X) (N430CH) - [SDR 2000ZZZX799](https://openairdocs.org/sdr/2000ZZZX799), Sep 4, 1999: Bolkms BK117A3. BOLT. WORN. BOLT WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (N117MV) - [SDR 2000ZZZX797](https://openairdocs.org/sdr/2000ZZZX797), Aug 30, 1999: Bolkms BK117B1. BOLT. WORN. BOLT WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (N417BK) All 95: https://openairdocs.org/jasc/6400/reports.md ## Other codes in chapter 64 - [JASC 6410](https://openairdocs.org/jasc/6410): Tail Rotor Blades (1,148 reports) - [JASC 6420](https://openairdocs.org/jasc/6420): Tail Rotor Head (907 reports) - [JASC 6440](https://openairdocs.org/jasc/6440): Tail Rotor Indicating System (4 reports) - [JASC 6497](https://openairdocs.org/jasc/6497): Tail Rotor System Wiring (3 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.