# Service difficulty reports: JASC 6400

A list on [JASC 6400](https://openairdocs.org/jasc/6400.md).

Reports filed under 6400 · Tail Rotor System, newest first.

Page 1 of 2 · 95 reports

- [SDR M3XA2025061109002](https://openairdocs.org/sdr/M3XA2025061109002.md): Unknown · vibration · Jun 9, 2025 · N836CS · Urocop EC135P2
  > PILOT PERFORMED A PRECAUTIONARY LANDING IN VACANT FIELD IN CARTHAGE, MS FOR IN STRAIGHT AND LEVEL FLIGHT AT 2500 MSL AT 120 KIAS, THERE WAS A HIGH FREQUENCY VIBRATION IN THE ANTI-TORQUE PEDALS. THE VIBRATION REMAINED THROUGH DESCENT TO LANDING.
- [SDR HDNA2024062802](https://openairdocs.org/sdr/HDNA2024062802.md): Arm · cracked · Jun 23, 2024 · N145NC · Bolkms BK117C2
  > PLAY WAS NOTICED IN TAIL ROTOR SYSTEM DURING A PREFLIGHT INSPECTION. INSPECTION OF SYSTEM FOUND A CRACK IN THE ARM OF THE ACTUATOR AND THE CARDIN JOINT BOLT WORN. AN AD AND ASB HAVE BEEN PREVIOUS COMPLIED WITH NO REOCCURRING INSPECTIONS REQUIRED DUE TO THE FIN
- [SDR QMLA2024040920036](https://openairdocs.org/sdr/QMLA2024040920036.md): Blade · failed · Apr 9, 2024 · N955AL · Urocop EC135T2
  > TWO EC135T2+ TAIL ROTOR BLADES HAVE CRACKED AND/OR SHOWN PITTING VISIBLE TO THE NAKED EYE IN THE BLADE ROOT WITHIN THE LAST 48 HOURS. (DAMAGE IS IN ZONE H ON OUTBOARD SIDE REQUIRING AIRBUS DISPOSITION PER AMM 64-22-00, 6-4) BLADE P/N L642A2002111 S/N'S M31134
- [SDR 2023FA0000790](https://openairdocs.org/sdr/2023FA0000790.md): Unknown · unknown · Nov 19, 2023 · N145SU · Bolkms BK117C2
  > DURING CRUISE FLIGHT, THE T/R CHIP LIGHT ILLUMINATED. THIS AIRCRAFT HAS NO FUZZ BURNER FOR THE TAIL ROTOR GEARBOXES. NOR IS THERE DIFFERENTIATION BETWEEN THE IGB AND THE TGB. THERE WERE NO OTHER INDICATIONS SUCH AS VIBRATION, OR LOSS OF CONTROLLABILITY. I DIVE
- [SDR QMLA2023091320071](https://openairdocs.org/sdr/QMLA2023091320071.md): Solenoid · unserviceable · Sep 13, 2023 · N458AM · Bell 407
  > PEDAL STOP LIGHT ILLUMINATED IN FLIGHT, ONCE CONFIGURED THE MANUAL RELEASE WAS ENGAGED AND LANDED WITHOUT ANY FURTHER INCIDENT.
- [SDR QR9R2023031700001](https://openairdocs.org/sdr/QR9R2023031700001.md): Unknown · failed insp · Mar 17, 2023 · Bolkms BK117C2
  > 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.md): Spar · cracked · Oct 25, 2022 · N746RH · Snias AS350B2
  > PILOT REPORTED NOISE FROM TAIL ROTOR DURING ROUTINE PREFLIGHT CHECK. REMOVAL AND INSPECTION OF TAIL ROTOR ASSEMBLY REVEALED A SPLINTERED SPAR OUTSIDE OF ALLOWABLE CRITERIA. COMPONENT HAD REACHED 94% OF ITS LIFE LIMIT. REPLACED WITH NEW PART.
- [SDR QR9R20220809002](https://openairdocs.org/sdr/QR9R20220809002.md): Tail Rotor · out of limits · Aug 9, 2022 · Bolkms BK117C2
  > AN INSPECTION OF THE LAMINATED STRAP ASSEMBLY REVEALED.007"+ CLEARANCE IN BETWEEN INDIVIDUAL LAMINATES WHICH EXCEEDS THE LIMITS OF.007" MAX ALLOWED.
- [SDR QMLA2022033120022](https://openairdocs.org/sdr/QMLA2022033120022.md): Chip Detector · used · Mar 31, 2022 · N911KX · Bell 429
  > THIS WAS A HOSPITAL TRANSFER FROM CRESTON, IA TO DES MOINES, IA. ON THE FIRST LEG BETWEEN KOXV AND CRESTON APPROXIMATELY HALF WAY (15MIN FLIGHT TIME) THE T/R CD INOP CAUTION LIGHT CAME ON AND WENT OFF AGAIN AFTER A FEW SECONDS. AROUND 5MIN LATER IT CAME ON AGA
- [SDR QMLA2018121218132](https://openairdocs.org/sdr/QMLA2018121218132.md): Actuator · unserviceable · Dec 12, 2018 · N7UC · Agusta A109E
  > UNCOMMANDED YAW INPUTS DURING FLIGHT.
- [SDR 8HBR20180611015](https://openairdocs.org/sdr/8HBR20180611015.md): Bearing · worn · May 3, 2018 · N7155W · Robsin R22
  > PITCH CONTROL BEARING WORN AT HALF LIFE OF LIFE-LIMIT.
- [SDR QMLA2017092517096](https://openairdocs.org/sdr/QMLA2017092517096.md): Tail Rotor · cracked · Sep 25, 2017 · N41299 · Snias AS350B2
  > DURING THE TAIL ROTOR 600HR/24 MONTH AIRFRAME INSPECTION (A 1660) FOUND 2EA "SPLITS" ON SLOPE. NOTE: ONLY 1 DAMAGE AREA PER SLOPE SHALL BE PERMITTED PER AMM. INSPECTION WAS CARRIED IAW AMM 64-10-00, 6-3. THIS AIRCRAFT REMAINS OUT OF SERVICE AT THE TIME OF THIS
- [SDR AC2R2016070601](https://openairdocs.org/sdr/AC2R2016070601.md): Lock Nut · defective · Jul 5, 2016 · N139CN · Agusta AW139
  > 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 TORQUE WAS APPLIED. THESE NUTS ARE USED ON TAIL ROTOR DAMPER BRACKET ATTACHMENT. WE HAVE REMOVED THIS BATCH, LOT NR J000020289-0000 OF NUTS F
- [SDR QMLA2013071613100](https://openairdocs.org/sdr/QMLA2013071613100.md): Pivot · corroded · Jul 16, 2013 · N433CM · Urocop EC135P2
  > THE PILOT REPORTED THAT ON FINAL APPROACH, THE LT TAIL ROTOR PEDAL BECAME STUCK, AND THE ACFT BEGAN FLYING TO THE RIGHT. DECIDED TO ABORT APPROACH, COULD NOT GAIN CONTROL TO LAND AT DESTINATION. DECLARED AN EMERGENCY, AND AFTER 20 SECONDS, PEDAL MOVEMENT R
- [SDR CA130508014](https://openairdocs.org/sdr/CA130508014.md): Screw · missing · May 3, 2013 · Doug MD900
  > (CAN) FOD DAMAGE TO NOTAR FAN. STATOR BLADE RETAINER SCREW FOUND MISSING.
- [SDR CA121010010](https://openairdocs.org/sdr/CA121010010.md): Pin · failed · Oct 10, 2012 · Bell 206B
  > (CAN) WHILE DOING PREFLIGHT CHECKS FOR A TRAINING FLIGHT WITH DUAL PILOTS AND DUAL CONTROLS INSTALLED, TRAINING PILOT WAS IN THE LT SEAT DURING START-UP. ONCE AT IDLE, THE PILOT IN THE LT SEAT ADJUSTED HIS SITTING POSITION, PUSHING HIMSELF BACKWARDS WHILE APPL
- [SDR ALGA2012061201](https://openairdocs.org/sdr/ALGA2012061201.md): Rotor · damaged · Jun 12, 2012 · N687AL · Bell 407
  > ONE TRUNNION, PN 407-312-100-101, SN LKFS3425, HAS ELASTOMERIC EXTRUSION, FOUR WORN BEARINGS, PN 406-312-100-101 AND TWO PITCH HORNS PN 406-012-108-107, PITTING. CORROSION BEYOND LIMITS.
- [SDR 2009FA0000920](https://openairdocs.org/sdr/2009FA0000920.md): Gearbox · leaking · Sep 29, 2009 · N656RB · Hughes 269C
  > PILOT NOTE THE TAIL ROTOR GEARBOX WAS LEAKING. GEARBOX WAS CLEANED WITH SOLVENT AND AIR DRIED AND THEN GROUND RAN FOR 2-3 MIN. LEAKAGE AND CRACK WERE NOTED IN AREA DEPICTED IN DIAGRAM BELOW. LOGBOOK RESEARCH NOTED NO EVIDENCE OF DAMAGE HISTORY OR TAIL ROTOR
- [SDR QMLA052309018](https://openairdocs.org/sdr/QMLA052309018.md): Chip Detector · illuminated · May 23, 2009 · N117NC · Bolkms BK117C1
  > IN CRUISE FLIGHT, TO PICK UP A PATIENT AT 2500MSL, ACFT EXPERIENCED A T/R CHIP LIGHT. THE ACFT COMPLETED THE EMERGENCY PROCEDURE FOR SAME, DIVERTED TO AN AIRPORT ABOUT 3 MILES AWAY, CALLING THE COMM CENTER AND ADVISED OF THE SITUATION. NORMAL SHUTDOWN COMPLETE
- [SDR CA090325007](https://openairdocs.org/sdr/CA090325007.md): Bearing · corroded · Mar 24, 2009 · Skrsky S61N
  > (CAN) NEW BEARING RECIEVED, FOUND TO BE CORRODED AS REMOVED FROM UNOPENED ORIGINAL PACKAGING.
- [SDR 2008FA0000337](https://openairdocs.org/sdr/2008FA0000337.md): Rod · chafed · Jul 1, 2008 · N83WP · Bell 206L3
  > DURING AN INSPECTION THE THE TAIL ROTOR PITCH CONTROL TUBE SLEEVES, WE DISCOVERED THAT BELLCRANK PN 206-001-763-001 HAD BEEN CHAFED INTO BY THE RIVET SECURING THE ROD END OF ROD ASSEMBLY PN 206-011-725-001. THIS WEAR OCCURS WHEN LEVER ASSEMBLY PN 206-011-722-1
- [SDR CA080403004](https://openairdocs.org/sdr/CA080403004.md): Trunnion · mismanufactured · Mar 31, 2008 · Bell 412EP
  > (CAN) MFG WAS ADVISED THAT 14 PCS. OF 212-076-004-101 SERVO ACTUATOR, TAIL ROTOR HAD A MISMANUFACTURED DETAIL. ONE OF THE SUSPECT UNITS WAS DELIVERED TO A CUSTOMER ON THE ACFT NOTED ABOVE. OTHER SUSPECT UNITS WERE ALSO DELIVERED TO CUSTOMERS. THE 14 SUSPECT
- [SDR CA071115005](https://openairdocs.org/sdr/CA071115005.md): Tail Rotor · out of balance · Nov 15, 2007 · Snias AS350B2
  > (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. SENDING T/R TO MFG FOR EVALUATION. (TC NR 20071115005)
- [SDR 2006FA0000116](https://openairdocs.org/sdr/2006FA0000116.md): Bellcrank · elongated · Nov 11, 2005 · Snias AS350B2
  > DURING 500 HOUR INSPECTION AND REMOVAL OF T/R SERVO OVERCENTERING MECHANISM, IT WAS DISCOVERED THAT THE MAIN SUPPORT BOLT AND THE BELLCRANK PIVOT BOLT WERE VERY DIFFICULT TO REMOVE. THE BELLCRANK PIVOT BOLT WAS OBVIOUSLY HAMMERED IN BY EVIDENCE OF THE RAISE
- [SDR ALGA104923](https://openairdocs.org/sdr/ALGA104923.md): Pitch Horn · corroded · Jul 22, 2005 · N557AL · Bell 407
  > EXCESSIVE PITTING FROM CORROSION BEYOND LIMITS / INSTALLED 2EA NEW PITCH HORNS BY OVERHAUL SHOP.
- [SDR ALGA098887](https://openairdocs.org/sdr/ALGA098887.md): Bearing · bent · Dec 8, 2004 · N1067D · Bell 206L1
  > BENT EXCESSIVLY, UNABLE TO SHIM NEW BEARINGS / REPLACED BLADE
- [SDR CA041213005](https://openairdocs.org/sdr/CA041213005.md): Bushing · cracked · Dec 4, 2004 · Snias AS350B2
  > (CAN) DURING ROUTINE HYDS OFF TRAINING, TAIL ROTOR INPUTS MADE THROUGH TAIL ROTOR PEDALS WERE NOT BEING TRANSFERRED TO TAIL ROTOR. PILOTS RESELECTED HYDS ON & TAIL ROTOR RESPONDED NORMALLY TO TAIL ROTOR INPUTS. AIRCRAFT RETURNED TO HANGAR FOR INSPECTION. WHEN
- [SDR TXER097946](https://openairdocs.org/sdr/TXER097946.md): Fairing · cracked · Oct 17, 2004 · N155EW · Urocop EC155B
  > TAIL ROTOR FAIRING CRACKED.
- [SDR KBM2004F00243](https://openairdocs.org/sdr/KBM2004F00243.md): Bearing · worn · Oct 15, 2004 · N313LV · Snias AS350B2
  > HALF SHELLS, WORN BEYOND LIMITS, REMOVED AND REPLACED.
- [SDR TXER100925](https://openairdocs.org/sdr/TXER100925.md): Tail Rotor · worn · Aug 30, 2004 · N588SC · Urocop EC120B
  > TAIL ROTOR, OUT OF LIMITS PER 64-21-00,6-9 ZONE D.
- [SDR HEEA087161](https://openairdocs.org/sdr/HEEA087161.md): Bearing · worn · Jun 9, 2003 · N3116L · Bell 206L3
  > WORN BEARINGS. SCRAPPED.
- [SDR CA030708009](https://openairdocs.org/sdr/CA030708009.md): Control Arm · chafed · May 1, 2003 · Bell 212
  > (CAN) CONTROL TUBE AT PRIOR MAINTENANCE EVENT WAS INSTALLED BACKWARDS (180 DEGREES OUT). TUBE HAD NYLATRON SLEEVES BUT REVERSED POSITION CAUSED WEAR AT AFT FAIRLEAD. TUBE WORN 0.013. TUBE WALL THICKNESS IS 0.035. PART REPLACED.
- [SDR AC2A084868](https://openairdocs.org/sdr/AC2A084868.md): Bearing · rough · Feb 24, 2003 · N430CT · Bell 430
  > TAIL ROTOR BEARING IS ROUGH. REPALCED BEARING.
- [SDR AC2A084863](https://openairdocs.org/sdr/AC2A084863.md): Lock Plate · damaged · Feb 24, 2003 · N430CT · Bell 430
  > LOCK PLATE HAD TO BE REPLACED WHEN TAILROTOR WAS REMOVED FOR PROBLEM OF A WORN, RUSTED TRUNNION, AND CRACKED SPLINE ON TAIL GEARBOX OUTPUT SHAFT. REPLACED LOCKPLATE ASSEMBLY.
- [SDR HEEA079987](https://openairdocs.org/sdr/HEEA079987.md): Housing · leaking · Jun 10, 2002 · N510PH · Bell 407
  > TAIL ROTOR CONTROL HOUSING LEAKING.
- [SDR HEEA078367](https://openairdocs.org/sdr/HEEA078367.md): Mount · damaged · Mar 22, 2002 · N457PH · Bell 407
  > RUBBED IS UNBONDED FROM SHOCK MOUNT.
- [SDR HEEA077682](https://openairdocs.org/sdr/HEEA077682.md): Bearing · separated · Jan 11, 2002 · N973AE · Snias AS350B
  > TAIL ROTOR BEARING SEPARATION.
- [SDR HEEA077272](https://openairdocs.org/sdr/HEEA077272.md): Bearing · failed · Nov 21, 2001 · N499PH · Bell 407
  > OIL COOLER SHAFT BEARING FAILED.
- [SDR LS1R076728](https://openairdocs.org/sdr/LS1R076728.md): Bellcrank · worn · Oct 22, 2001 · N5027P · Hughes 369D
  > TAIL ROTOR BELLCRANK EARS WORN AND SPRUNG.
- [SDR HEEA076586](https://openairdocs.org/sdr/HEEA076586.md): Bearing · worn · Oct 11, 2001 · N3108E · Bell 206L3
  > BEARINGS WORN AND RUSTED. REPLACED WITH SERVICEABLE PART.
- [SDR LS1R074920](https://openairdocs.org/sdr/LS1R074920.md): Link · worn · Jul 20, 2001 · N5027P · Hughes 369D
  > PART IS WORN EXCESSIVELY.
- [SDR LS1R074919](https://openairdocs.org/sdr/LS1R074919.md): Link · worn · Jul 20, 2001 · N5027P · Hughes 369D
  > PART IS WORN EXCESSIVELY.
- [SDR HEEA073576](https://openairdocs.org/sdr/HEEA073576.md): Rod · worn · Jun 18, 2001 · N6160Y · Bell 206L3
  > WORN BEARING. REPLACED WITH SERVICEABLE ASSY.
- [SDR HEEA073575](https://openairdocs.org/sdr/HEEA073575.md): Rod · rough · Jun 18, 2001 · N45RP · Bell 206L1
  > ROUGH BEARING. REPLACED WITH SERVICEABLE ASSY.
- [SDR HEEA073574](https://openairdocs.org/sdr/HEEA073574.md): Rod · binding · Jun 18, 2001 · N21497 · Bell 206L3
  > BINDING. REPLACED WITH SERVICEABLE ASSY.
- [SDR HEED065731](https://openairdocs.org/sdr/HEED065731.md): Bellcrank Assy · worn · Dec 15, 1999 · N236X · Bell 230
  > BELLCRANK ASSY HAS WORN BEARING. REPLACED UNIT.
- [SDR HEED065725](https://openairdocs.org/sdr/HEED065725.md): Link Assy · worn · Dec 14, 1999 · N236X · Bell 230
  > LINK ASSY HAS WORN BEARINGS.
- [SDR AC2A0000008](https://openairdocs.org/sdr/AC2A0000008.md): Bushing · frozen · Sep 5, 1999 · N430CH · Bell 430
  > LOWER AFT MOUNT FOR TAIL ROTOR GUARD LOOSE (BUSHING FROZEN ON BOLT CAUSING WEAR AD PLAY). (X)
- [SDR 2000ZZZX799](https://openairdocs.org/sdr/2000ZZZX799.md): Bolt · worn · Sep 4, 1999 · N117MV · Bolkms BK117A3
  > BOLT WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.
- [SDR 2000ZZZX797](https://openairdocs.org/sdr/2000ZZZX797.md): Bolt · worn · Aug 30, 1999 · N417BK · Bolkms BK117B1
  > BOLT WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

Next page: https://openairdocs.org/jasc/6400/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 = '6400'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/jasc/6400/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.