# Service difficulty reports: JASC 6710

A list on [JASC 6710](https://openairdocs.org/jasc/6710.md).

Reports filed under 6710 · Main Rotor Control, newest first.

Page 1 of 24 · 1,151 reports

- [SDR QMLA2026030820016](https://openairdocs.org/sdr/QMLA2026030820016.md): Collective · loose · Mar 8, 2026 · N492AE · Urocop EC135P2
  > HEALTHNET 1 WAS DISPATCHED FOR AN IFT FROM RUBY TO WEST PENN. WE WERE TURNING LONG FINAL FOR BRAVO PAD, AND I WAS GETTING THE AIRCRAFT IN AN APPROACH PROFILE. WHILE I WAS LOWERING THE COLLECTIVE, IT HIT A STICKING POINT ABOUT HALFWAY DOWN. I CALLED FOR THE ABO
- [SDR 2025FA0000647](https://openairdocs.org/sdr/2025FA0000647.md): Vartoms · faulted · Sep 12, 2025 · N240SF · Bolkms BK117C2
  > VARTOMS SYSTEM KICKED INTO MANUAL MODE AS ENGINES COULDN'T HOLD TORQUE MATCHING AT THE SPECIFIC POWER SETTING. SYSTEM WAS TROUBLESHOT AND FOUND TO BE WITHIN ALL PARAMETERS. NO DEFECTS NOTED DURING TEST FLIGHTS.
- [SDR 2025FA0000014](https://openairdocs.org/sdr/2025FA0000014.md): Coll Pitch Cntr · abnormal · Jan 3, 2025 · N140SF · Bolkms BK117C2
  > COLLECTIVE FRICTION WAS TOO LIGHT ALLOWING COLLECTIVE TO FALL WHEN HANDS OFF CONTROLS. FOUND THE COLLECTIVE FRICTION KNOB FULLY LOOSENED AND NOT TIGHTENED TO INPUT COLLECTIVE FRICTION ON THE COLLECTIVE ALLOWING THE CONSTANT POWER TO BE MAINTAINED.
- [SDR 2024FA0000193](https://openairdocs.org/sdr/2024FA0000193.md): Boot · debonded · Feb 28, 2024 · N446TC · Robsin R44RAVENII
  > C156-2 BLADE BOOTS FAILED. THE RUBBER IS DELAMINATING. WE HAVE SEEN THIS FROM 3 PAIRS OF THE LATEST REVISION OF BOOTS AND HAVE PRESENTED IT TO THE MANUFACTURER. THEY DO NOT ACKNOWLEDGE THE PROBLEM EXISTING. CONFRENCE WITH OTHER OPERATORS CONFIRMS OUR EXPER
- [SDR U0GA202311150001](https://openairdocs.org/sdr/U0GA202311150001.md): Control Rod · damaged · Nov 13, 2023 · N760BG · Skrsky S76C
  > BRISTOW RECENTLY DISCOVERED A LOOSE JAM NUT ON AFT M/R SERVO INPUT ROD END DURING A SCHEDULED INSPECTION. THE JAM NUT IS THE SUBJECT OF FAA AD 2015-19-51, AD 2017-19-01 AND SIK AWL 300 HOUR INSPECTION ITEM 30A. THE INTENT OF THESE INSPECTIONS IS ‘. TO DETECT
- [SDR U0GA FCD 00487](https://openairdocs.org/sdr/U0GA%20FCD%2000487.md): Control Rod · cracked · Sep 12, 2023 · N228BJ · Urocop EC135P2
  > DURING AIRCRAFT INSPECTION PROMPTED BY SIMILAR DEFECT ON ANOTHER FLEET AIRCRAFT. CRACK FOUND ON LH (LONGITUDNAL) MR SERVO INPUT FLIGHT CONTROL ROD. REF EC135P2+ IPC IPC 22-18-10-01, ITEM 10
- [SDR U0GA TL 248039](https://openairdocs.org/sdr/U0GA%20TL%20248039.md): Control Rod · cracked · Sep 12, 2023 · N325DB · Urocop EC135P2
  > DURING AIRCRAFT INSPECTION PROMPTED BY SIMILAR DEFECT ON ANTHER FLEET AIRCRAFT. CRACK FOUND ON LH (LONGITUDNAL) MR SERVO INPUT FLIGHT CONTROL ROD. REF EC135P2+ IPC IPC 22-18-10-01, ITEM 10
- [SDR U0GA TL 247933](https://openairdocs.org/sdr/U0GA%20TL%20247933.md): Control Rod · cracked · Sep 11, 2023 · N127JL · Urocop EC135P2
  > DURING AIRCRAFT AAIP INSPECTION CRACK FOUND ON LH (LONGITUDNAL) MR SERVO INPUT FLIGHT CONTROL ROD. REF EC135P2+ IPC IPC 22-18-10-01, ITEM 10
- [SDR U0GA202307072410](https://openairdocs.org/sdr/U0GA202307072410.md): Lock Nut · cracked · Jul 6, 2023 · N820FT · Agusta A109E
  > WHILE PERFORMING THE POST FLIGHT CHECK IT WAS FOUND THAT THE SWASHPLATE SUPPORT WAS LOOSE AT ITS MOUNTING POINT. UPON FURTHER INSPECTION IT WAS FOUND THAT ALL 6 NUTS WERE WORN AT THE BASE AND 5 OF THE 6 WERE CRACKED. ALL NUTS WERE BACKED OFF APPROX.1.5 TURNS A
- [SDR QR9R202305220002](https://openairdocs.org/sdr/QR9R202305220002.md): Actuator · warning message · May 22, 2023 · Bolkms BK117C2
  > ACTUATER FAIL CAUTION MESSAGE AND CIRCUT BREAKER POPPED 45 MINUTES INTO FLIGHT. BACKUP SAS AND ACTUATOR MESSAGES INDICATED ON CAD. REMOVED AND REPLACED YAW SEMA IAW AMM 67-20-00,4-14. MOC COMPLETED IAW AMM 05-60-00 6-1.
- [SDR HDNA20220629001](https://openairdocs.org/sdr/HDNA20220629001.md): Control Rod · cracked · Jun 29, 2022 · N145FH · Bolkms BK117C2
  > MAINTENANCE NOTED DURING THE PERFORMANCE OF A "DAILY AIRWORTHINESS CHECK" MULTIPLE CRACKS AT THE FORWARD END OF THE NON-BOOSTED COLLECTIVE UPPER FLIGHT CONTROL ROD PART NUMBER B291M00X4101.
- [SDR QR9R20220624001](https://openairdocs.org/sdr/QR9R20220624001.md): Actuator · illuminated · Jun 24, 2022 · Bolkms BK117C2
  > P ACTUATOR FAILURE ON TAKEOFF FROM PAD. DURING TEST FLIGHT EVALUATION, ACTUATOR LIGHT ILLUMINATED ON CAD WITH A MOMENTARY FLASH OF THE AMBER P BLOCK ON PFD. AP1 OR AP2 DID NOT DISENGAGE AT ANY MOMENT NOR FLASHED ON CAD. REPLACED SEMA ACTUATOR IAW 67-10-00,4-2.
- [SDR XSFA20211016001](https://openairdocs.org/sdr/XSFA20211016001.md): Spring · misinstalled · Oct 16, 2021 · N963SA · Snias AS350B2
  > WHILE CONVERTING AIRCRAFT CONFIGURATION FROM SINGLE PILOT CONTROLS TO DUAL PILOT CONTROLS FOR PILOT TRAINING, MECHANIC FOUND COLLECTIVE CONTROL SPRING, SPRING WASHER, AND COVER LEFT IN COLLECTIVE CONTROL BOX. PREVIOUS MECHANIC HAD CONVERTED AIRCRAFT FROM DUAL
- [SDR 2A6R202107016112](https://openairdocs.org/sdr/2A6R202107016112.md): Shaft · corroded · Jul 2, 2021 · N135HN · Urocop EC135P2
  > DURING 1000 HOUR AIR FRAME INSPECTION, FOUND THE COLLECTIVE SHAFT UNDER THE COCKPIT FLOOR CORRODED BEYOND LIMITS.
- [SDR 2021FA0000063](https://openairdocs.org/sdr/2021FA0000063.md): Shaft · mismanufactured · Feb 26, 2021 · N37214
  > FOLLOWING A WRONG REPAIR PROCESS OF THE FREEWHEEL SHAFT, IT HAS BEEN OBSERVED A CASEHARDENING THICKNESS MEASURED AT 0.7 MM INSTEAD OF A VALUE REQUIRED BETWEEN 1.2 MM AND 1.4MM. THIS NON-CONFORMITY CAN REDUCE THE FATIGUE STRENGTH IN THOSE SECTIONS AND A CRACK B
- [SDR QMLA2020052920024](https://openairdocs.org/sdr/QMLA2020052920024.md): Collective Stick · corroded · May 28, 2020 · N145HN · Bolkms BK117C2
  > DURING INSPECTION A 4360.3 ITEM 3.4.4 FOUND CORROSION ON THE COPILOT SIDE COLLECTIVE SHAFT AT THE WELD FOR COLLECTIVE LEVER. AIRCRAFT REMAINS OUT OF SERVICE AT HIS TIME, PENDING REPLACEMENT OF COLLECTIVE CONTROL SHAFT.
- [SDR X2RA2020061500001](https://openairdocs.org/sdr/X2RA2020061500001.md): Bearing · seized · May 5, 2020 · N138TX · Hughes 369D
  > PILOT NOTICED THE COLLECTIVE MOTION WAS RATCHETY. INSPECTION FOUND THAT THE BEARINGS, SELF-ALIGNING, WERE SEIZED UP SOLID. REPLACEMENT OF THE LINK ASSY CURED THE ISSUE. THE LINK HAD BEEN INSTALLED NEW, 3 DAYS BEFORE WITH 11.4 HOURS TSN AT REMOVAL.
- [SDR CA191210010](https://openairdocs.org/sdr/CA191210010.md): Link · failed · Jul 31, 2019 · Bell 407
  > (CAN) DURING REGULAR 2500HRS INSPECTION. INSERT FAILED PROOF LOADING PREMATURELY (APPROX 100IN-LBS) (TC# 20191210010)
- [SDR YV3R2019071900148](https://openairdocs.org/sdr/YV3R2019071900148.md): Servo · leaking · Jul 15, 2019 · Robsin R44
  > CUSTOMER REPORTED HYDRAULIC SERVO P/N: D212-1 IS LEAKING.
- [SDR YV3R2019071900147](https://openairdocs.org/sdr/YV3R2019071900147.md): Servo · leaking · Jul 15, 2019 · Robsin R44
  > CUSTOMER REPORTED HYDRAULIC SERVO P/N: D212-1 IS LEAKING FROM CONTROL VALVE SIDE PLATES.
- [SDR YV3R2019071900146](https://openairdocs.org/sdr/YV3R2019071900146.md): Servo · leaking · Jul 15, 2019 · Robsin R44
  > CUSTOMER REPORTED HYDRAULIC SERVO P/N: D212-1 IS LEAKING FROM CONTROL VALVE SIDE PLATES.
- [SDR YV3R2019071900145](https://openairdocs.org/sdr/YV3R2019071900145.md): Servo · leaking · Jul 15, 2019 · Robsin R44
  > CUSTOMER REPORTED HYDRAULIC SERVO P/N: D212-1 IS LEAKING FROM CONTROL VALVE SIDE PLATES.
- [SDR YV3R2019071800144](https://openairdocs.org/sdr/YV3R2019071800144.md): Servo · leaking · Jul 15, 2019 · Robsin R44RAVENII
  > CUSTOMER REPORTED HYDRAULIC SERVO ASSEMBLY P/N: D212-1 LEAKED UPON TESTING AFTER INSTALLATION.
- [SDR YV3R2019012200143](https://openairdocs.org/sdr/YV3R2019012200143.md): Servo · leaking · Jul 15, 2019 · Robsin R44RAVENII
  > CUSTOMER REPORTED HYDRAULIC SERVO ASSEMBLY P/N: D212-1 LEAKED UPON TESTING AFTER INSTALLATION.
- [SDR YV3R2019071800142](https://openairdocs.org/sdr/YV3R2019071800142.md): Servo · leaking · Jul 15, 2019 · Robsin R44RAVENII
  > CUSTOMER REPORTED HYDRAULIC SERVO ASSEMBLY P/N: D212-1 LEAKED UPON TESTING AFTER INSTALLATION.
- [SDR 2A6R2019062052804](https://openairdocs.org/sdr/2A6R2019062052804.md): Shaft · corroded · Jun 20, 2019 · N911EF · Urocop EC135P2
  > DURING INSPECTION FOUND CORROSION ON THE COLLECTIVE SHAFT AT THE FRICTION BRAKE ATTACHMENT POINT. WILL REMOVE AND REPLACE COLLECTIVE SHAFT
- [SDR E3MA2019051000001](https://openairdocs.org/sdr/E3MA2019051000001.md): Actuator · corroded · May 8, 2019 · N884ME · Urocop EC135T2
  > DURING COMPLIANCE WITH EASB EC135-67A-039 PITTING WAS DISCOVERED ON CONNECTING ROD OF THE LATERAL HYDRAULIC ACTUATOR.
- [SDR E3MA2019051000002](https://openairdocs.org/sdr/E3MA2019051000002.md): Actuator · corroded · May 6, 2019 · N703ME · Urocop EC135P2
  > DURING COMPLIANCE WITH EASB EC135-67A-039 PITTING WAS DISCOVERED ON CONNECTING ROD OF THE LATERAL HYDRAULIC ACTUATOR.
- [SDR CA190430031](https://openairdocs.org/sdr/CA190430031.md): Friction Cup · worn · Apr 24, 2019 · Snias AS350D
  > (CAN) HAD COMPLAINT OF FRICTION STICKING, THEN NO FRICTION, FOUND THE FRICTION BALL TO HAVE WEAR ON IT. ALSO HAD THE FRICTION CUP OR FOLLOWER ON IT (SUPPOSED TO BE A 1 PIECE ASSEMBLY, BREAK AND TURN INTO 3 PIECES. (P/N 350A27159100) THIS LOWER CUP WAS THEN AL
- [SDR CA191010017](https://openairdocs.org/sdr/CA191010017.md): Transducer · faulted · Apr 7, 2019 · Skrsky S76C
  > (CAN) NUMBER 1 DECU FAULT APPEARED. DECU FAULT CLEARED BY RESETTING BATTERY. ON NEXT FLIGHT DECU FAULT REAPPEARED ALONG WITH NUMBER 1 ENGINE OSCILLATIONS OF 20%. COLLECTIVE POSITION TRANSDUCER REPLACED - FAULT CLEARED. (TC# 20191010017)
- [SDR YV3R2019012200024](https://openairdocs.org/sdr/YV3R2019012200024.md): Servo · leaking · Feb 15, 2019 · Robsin R44
  > CUSTOMER REPORTED SERVO P/N: D212-1 LEAKING.
- [SDR 2A6R201810035001](https://openairdocs.org/sdr/2A6R201810035001.md): Shaft · corroded · Oct 3, 2018 · N135TG · Urocop EC135T2
  > WHILE INSPECTION OF AN AVIONICS INSTALLATION FOUND CORROSION ON THE COLLECTIVE SHAFT AT THE FRICTION BRAKE ATTACH POINT
- [SDR HEER201804190961](https://openairdocs.org/sdr/HEER201804190961.md): Actuator · binding · Apr 16, 2018 · N410PH · Bell 407
  > AFTER TAKEOFF, ABOUT TO LEVEL OFF AT 1000 FEET, EXPERIENCED A CYCLIC CONTROL ISSUE. CYCLIC BINDING AND HEAVY CREEP REARWARD. HYD ACTUATOR BINDING.
- [SDR EVCA201803280001](https://openairdocs.org/sdr/EVCA201803280001.md): Friction Block · dirty · Mar 28, 2018 · N339AE · Snias AS350B2
  > AFTER DEPARTING FROM BASE PILOT NOTED THAT CYCLIC WOULD NOT MOVE PAST CENTER IN THE LEFT DIRECTION AFTER FLYING FOR 5 MINUTES. RETURNED TO BASE AND LANDED WITHOUT INCIDENT. DURING MAINTENANCE INVESTIGATION, FOUND CYCLIC FRICTION ASSEMBLY TO BE DIRTY. AFTER C
- [SDR CHIR201803303212](https://openairdocs.org/sdr/CHIR201803303212.md): Beam · cracked · Mar 12, 2018 · N245CH · Boeing 234
  > AFT ROTOR HEAD WAS IN SHOP FOR A SCHEDULED CENTER ROTOR HUB REPLACEMENT. DURING DISASSEMBLY, HORIZONTAL PIN LOCKING BEAM FOUND TO BE CRACKED. RESEARCH REVEALS THE CRACKED LOCKING BEAM TO BE AN OUTLIER. REPLACED AND COMPONENT RETURNED TO SERVICE.
- [SDR QMLA2018030418028](https://openairdocs.org/sdr/QMLA2018030418028.md): Cyclic Control · malfunctioned · Mar 4, 2018 · N1174U · Bolkms BK117B2
  > PILOT CLAIMED THAT IN LEVEL FLIGHT THE CYCLIC FLIGHT CONTROL WOULD NOT MOVE MORE THAN AN INCH IN ANY DIRECTION. TRIED SYSTEM 2 AND HAD THE SAME BLOCKAGE AND WENT BACK TO SYSTEM 1. NOTED TO ME THAT THE COLLECTIVE AND YAW WAS ACTING NORMAL ONLY THE CYCLIC HAD
- [SDR HEER20180208017](https://openairdocs.org/sdr/HEER20180208017.md): Collective Stick · binding · Feb 8, 2018 · N327PH · Urocop EC135P2
  > DURING APPROACH, THE COLLECTIVE STARTED BINDING AT 30 TORQUE. PERFORMED A GO AROUND AND RETURNED TO BASE. INCREASE IN COLLECTIVE NOT AFFECTED. UNABLE TO LOWER COLLECTIVE BELOW 17 TORQUE. COPILOTS COLLECTIVE STICK LOCKING CIRC SAFETY STIRRUP WAS DEFORMED
- [SDR E3MA2017111600001](https://openairdocs.org/sdr/E3MA2017111600001.md): Actuator · binding · Nov 15, 2017 · N944ME · Urocop EC135T2
  > DURING A POST ENGINE MAINTENANCE GROUND RUN, THE PILOT COULD NOT MOVE THE CYCLIC IN THE AFT DIRECTION DURING THE HYDRAULIC SYSTEM CHECK. INSPECTION OF THE MAIN ROTOR CONTROL SYSTEM REVEALED THAT THE LONGITUDINAL ACTUATOR WAS AT THE FULL AFT TRAVEL LIMIT. WIT
- [SDR HDNR2017111600001](https://openairdocs.org/sdr/HDNR2017111600001.md): Control Rod · cracked · Nov 13, 2017 · N444YE · Urocop EC135P2
  > WHILE PERFORMING SCHEDULED MAINTENANCE, CRACKS WERE FOUND IN THE SAS LONGITUDINAL CONTROL ROD. THE CRACKS EXTEND TO THE RIVET HOLES.
- [SDR FTYR N447BH](https://openairdocs.org/sdr/FTYR%20N447BH.md): Bearing · worn · Oct 20, 2017 · N447BH · Bell 407
  > ROD END BEARING WORN BEYOND LIMITS.
- [SDR JYDR20170810191](https://openairdocs.org/sdr/JYDR20170810191.md): Pilot Valve · scored · Aug 9, 2017 · Skrsky S64E
  > RIGHT LATERAL SERVO RECEIVED WITH A WHITE-UP OF "RIGHT LATERAL SECOND STAGE PILOT VALVE STUCK". CONFIRMED SECOND STAGE PILOT VALVE STUCK. DISASSEMBLED PILOT VALVE AND FOUND SCORING. HYDRAULIC OIL SAMPLE WILL BE SENT OUT TO DETERMINE WHAT CAUSED SCORING OF PILO
- [SDR EVCA201705301](https://openairdocs.org/sdr/EVCA201705301.md): Tube · damaged · May 30, 2017 · N269AE · Bell 206L3
  > WHILE PERFORMING INSPECTION OF THE AIRCRAFT, FOUND ONE CYCLIC TUBE TO HAVE THE FIXEDAND NON ADJUSTABLE CLEVIS ON THE TRANSMISSION BELLCRANK END OF THE CONTROL TUBE TO BE ROTATING WITHIN THE TUBE.
- [SDR EVCA201705261](https://openairdocs.org/sdr/EVCA201705261.md): Control Tube · rotated · May 25, 2017 · N782AE · Bell 206L4
  > FIXED LENGTH COLLECTIVE CONTROL TUBE, FOUND TO HAVE ROTATATED BETWEEN THE CLEVIS AND THE CONTROL TUBE BODY AT THE SERVO END OF THE CONTROL TUBE.
- [SDR EVCA201705221](https://openairdocs.org/sdr/EVCA201705221.md): Control Tube · abnormal · May 22, 2017 · N559AE · Bell 206L4
  > WHILE PERFORMING INSPECTION OF THE AIRCRAFT FOUND THE COLLECTIVE CONTROL TUBE FOUND TO HAVE ROTATIONAL MOVEMENT BETWEEN THE CLEVIS AND THE CONTROL TUBE AT THE JUNCTION WITH THE TRANSMISSION BELLCRANK.
- [SDR EVCA201705201](https://openairdocs.org/sdr/EVCA201705201.md): Control Tube · abnormal · May 20, 2017 · N229AE · Bell 206L1
  > WHILE PERFORMING PREFLIGHT OF THE AIRCRAFT FOUND ONE CYCLIC TUBE TO HAVE THE FIXED AND NONADJUSTABLE CLEVIS ON THE SERVO END OF THE CONTROL TUBE TO BE ROTATING WITHIN THE TUBE.
- [SDR EVCA201705173](https://openairdocs.org/sdr/EVCA201705173.md): Control Tube · abnormal · May 17, 2017 · N469AE · Bell 206L4
  > WHILE PERFORMING A PREFLIGHT INSPECTION OF THE AIRCRAFT FOUND COLLECTIVE CONTROL TUBE TO HAVE ONE OF ITS FIXED AND NONADJUSTABLE CLEVISES TO BE ROTATING WITHIN THE TUBE.
- [SDR EVCA201705172](https://openairdocs.org/sdr/EVCA201705172.md): Tube · damaged · May 17, 2017 · N479AE · Bell 206L4
  > WHILE PERFORMING PREFLIGHT OF THE AIRCRAFT FOUND BOTH CYCLIC TUBES PN: 206-001-193-001 SN: US1214 AND US1215 TO HAVE THEIR FIXED AND NON ADJUSTABLE CLEVISES TO BE ROTATING WITHIN THE TUBES.
- [SDR EVCA201705171](https://openairdocs.org/sdr/EVCA201705171.md): Tube · damaged · May 17, 2017 · N479AE · Bell 206L4
  > WHILE PERFORMING PREFLIGHT OF THE AIRCRAFT FOUND BOTH CYCLIC TUBES TO HAVE THEIR FIXED AND NON ADJUSTABLE CLEVISES TO BE ROTATING WITHIN THE TUBES.
- [SDR 2016FA0000485](https://openairdocs.org/sdr/2016FA0000485.md): Mixing Unit · misinstalled · Oct 11, 2016 · N853BP · Snias AS350B3
  > MAIN ROTOR FLIGHT CONTROL MIXING UNIT HAS BLIND RIVET FASTENERS IN USE WHERE THE ANTICIPATOR CONTROL ARM ATTACHES THE MIXING UNIT.
- [SDR 7AJA20160608003](https://openairdocs.org/sdr/7AJA20160608003.md): Control Servo · unreliable · Jun 2, 2016 · N866M · Snias AS350B3
  > UPON APPROACH, THE AMBER SERVO CAUTION ANNUNCIATOR ILLUMINATED. NO LOSS OF FLIGHT CONTROL WAS OBSERVED. IT WAS FOUND THAT THE RT LATERAL SERVO HAD EXPERIENCE AN INTERNAL FAILURE.

Next page: https://openairdocs.org/jasc/6710/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 = '6710'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/jasc/6710/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.