# Service difficulty reports: JASC 6730

A list on [JASC 6730](https://openairdocs.org/jasc/6730.md).

Reports filed under 6730 · Rotorcraft Servo System, newest first.

Page 1 of 13 · 647 reports

- [SDR 454A260420151853](https://openairdocs.org/sdr/454A260420151853.md): Spring · overtorqued · Apr 20, 2026 · N369PA · Bell 407
  > DURING CLIMBOUT, LOUD BRIEF BUZZING NOISE HEARD. CREW STARTED SMELLING A CHARRING SMELL. CHARRING SMELL INCREASED WHILE ON THE GROUND. MAINTENANCE CREW TROUBLESHOT. EXTERNAL HYDRO POWER WAS APPLIED TO ATTEMPT TO IDENTIFY THE SERVO. COULD NOT REPLICATE THE CHAR
- [SDR PN1R202602200002](https://openairdocs.org/sdr/PN1R202602200002.md): Servo Control · leaking · Feb 20, 2026 · N568AE · Snias AS350B3
  > DURING INSPECTION FOUND RIGHT HAND MAIN ROTOR SERVO HAS STATIC LEAK. REPLACED SERVO.
- [SDR QR9R2023032200001](https://openairdocs.org/sdr/QR9R2023032200001.md): Actuator · illuminated · Mar 22, 2023 · Bolkms BK117C2
  > DURING FLIGHT THE ACTUATOR MASTER CAUTION ILLUMINATED. AIRCRAFT STARTED TO EXPERIENCE HEADING/TRIM ANOMALIES. FLIGHT CONTROLS ALSO BECAME INCREASINGLY SLUGGISH. DURING TEST FLIGHT EVAL, 35 MINUTES INTO FLIGHT, ACTUATOR ILLUMINATED ON CAD. PFD DISPLAYED A YAW A
- [SDR QR9R20220311001](https://openairdocs.org/sdr/QR9R20220311001.md): Actuator · failed · Mar 11, 2022 · Bolkms BK117C2
  > AIRCRAFT FAILED AP TEST. TF MOC FOUND AP TEST FAILED WITH "Y" CAUT ON PFD AND AP1 / AP2 TRIM CAUTIONS ON CAD. HYD TEST PERFORMED DURING RUNUP FOUND PEDALS TO BE TIGHT WHEN TESTING SYSTEM #2. TAIL ROTOR ACTUATOR FAILED CONTROL FORCES TEST WITH A MEAN MEASUREMEN
- [SDR AC2A202110029201](https://openairdocs.org/sdr/AC2A202110029201.md): Servo · unserviceable · Oct 2, 2021 · N292MH · Skrsky S92A
  > TAIL ROTOR SERVO CONTROL LINKAGE INTERCONNECT LINK BEARINGS WORN TO LIMITS
- [SDR QR9R20210921001](https://openairdocs.org/sdr/QR9R20210921001.md): Actuator · out of tolerance · Sep 21, 2021 · Bolkms BK117C2
  > T/R ACTUATOR INPUT LEVER BEARING WORN PAST TOLERANCE OF.6 MM. MEASURES.762 MM RADIAL PLAY. MAINTENANCE REPLACED T/R ACTUATOR IAW AMM 67-34-00, 4-1. OPS CHECK COMPLETED OK IAW 05-60-00, 6-1. *NOT FOUND IN AIRCRAFT INQUIRY
- [SDR AC2A202109299201](https://openairdocs.org/sdr/AC2A202109299201.md): Control Servo · unserviceable · Sep 20, 2021 · N927SC · Skrsky S92A
  > TAIL ROTOR SERVO CONTROL LINKAGE BEARINGS WORN TO LIMITS
- [SDR CA190705005](https://openairdocs.org/sdr/CA190705005.md): Servo · abnormal · Jul 3, 2019 · Urocop EC130B4
  > (CAN) DURING THE DAILY INSPECTION AFTER THE LAST FLIGHT OF THE DAY, THE FORWARD MAIN ROTOR SERVO INPUT ROD WAS FOUND WITH ABNORMAL MOVEMENT. THE SERVO WAS OVERHAULED 637.6 HOURS PRIOR TO THIS EVENT. THE AIRCRAFT IS GROUNDED AND THE SERVO REMOVED FROM THE AI
- [SDR CA190603014](https://openairdocs.org/sdr/CA190603014.md): Servo · leaking · May 30, 2019 · Snias AS350B3
  > (CAN) HYRAULIC SERVO STARTED LEAKING BEYOND LIMITS AND WAS REMOVED FOR REPAIR AND REPLACED WITH OVERHAULED UNIT. NOR FURTHER ACTION REQUIRED. (TC# 20190603014)
- [SDR CA190524013](https://openairdocs.org/sdr/CA190524013.md): Servo · damaged · May 23, 2019 · Agusta AW139
  > (CAN) ON TWO SEPARATE OCCASIONS WE HAVE RECEIVED A HYDRAULIC COMPONENT WITH ALUMINUM SHIPPING CAPS THAT HAVE A RUBBER SEAL INSIDE WHICH BECOMES DISLODGED ON CAP REMOVAL AND THE RUBBER SEAL STAYS INSIDE THE PORT ON THE NEWLY INSTALLED COMPONENT. LUCKILY, IT HAS
- [SDR YV3R2019012200088](https://openairdocs.org/sdr/YV3R2019012200088.md): Servo · leaking · May 15, 2019 · Robsin R44RAVENII
  > CUSTOMER REPORTED HYDRAULIC SERVO ASSEMBLY P/N: D212-1 IS LEAKING.
- [SDR YV3R2019012200087](https://openairdocs.org/sdr/YV3R2019012200087.md): Servo · leaking · May 15, 2019 · Robsin R44RAVENII
  > CUSTOMER REPORTED HYDRAULIC SERVO ASSEMBLY P/N: D212-1 WAS LEAKING.
- [SDR YV3R2019012200084](https://openairdocs.org/sdr/YV3R2019012200084.md): Servo · leaking · May 15, 2019 · Robsin R44RAVENII
  > CUSTOMER REPORTED HYDRAULIC SERVO ASSEMBLY IS LEAKING.
- [SDR AC2R2019060549206](https://openairdocs.org/sdr/AC2R2019060549206.md): Servo · worn · May 12, 2019 · N292MH · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR YV3R2019012200079](https://openairdocs.org/sdr/YV3R2019012200079.md): Servo · leaking · May 6, 2019 · Robsin R44
  > CUSTOMER REPORTED HYDRAULIC SERVO ASSEMBLY P/N: D212-1 IS LEAKING.
- [SDR AC2R2019050201](https://openairdocs.org/sdr/AC2R2019050201.md): Pressure Switch · leaking · Apr 30, 2019 · N639GG · Agusta AW139
  > WHILE ENTERING A LEFT DOWNWIND FOR RWY 18 INTO KGAO ABOUT 3 MILES SOUTH OF THE AIRFIELD, THE HYDRAULIC UTIL PRESS CAS ILLUMINATED. WENT TO THE HYDRAULIC SYNOPTIC PAGE AND THE #2 HYDRAULIC RESERVOIR WAS INDICATING 50% HYDRAULIC FLUID. IMMEDIATELY LOWERED THE LA
- [SDR HDNA201904290015](https://openairdocs.org/sdr/HDNA201904290015.md): Servo · damaged · Apr 29, 2019 · N135BU · Urocop EC135P1
  > THE AFT RIGHT HOLD DOWN BOLT FOR THE COLLECTIVE MAIN ROTOR SERVO ACTUATING ROD COLLAR, BOLT HEAD SEPARATED FROM BOLT SHAFT.
- [SDR YV3R2019012200071](https://openairdocs.org/sdr/YV3R2019012200071.md): Servo · leaking · Apr 18, 2019 · Robsin R44
  > CUSTOMER REPORTED HYDRAULIC SERVO P/N: D212-1 WAS LEAKING.
- [SDR YV3R2019012200069](https://openairdocs.org/sdr/YV3R2019012200069.md): Servo · leaking · Apr 17, 2019 · Robsin R44
  > CUSTOMER REPORTED HYDRAULIC SERVO P/N: D212-1 HAD AN OIL LEAK.
- [SDR AC2R2019060549203](https://openairdocs.org/sdr/AC2R2019060549203.md): Servo · worn · Mar 9, 2019 · N921GL · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR CA190220027](https://openairdocs.org/sdr/CA190220027.md): Limit Switch · leaking · Feb 10, 2019 · Snias AS350B3
  > (CAN) REPLACEMENT SERVO FOR SDR 20190220025 LEAKED AFTER 0.2 TEST FLIGHT. LIMIT SWITCH LEAKING HYDRAULIC FLUID AND ALSO LIMIT SWITCH LIGHT ILLUMINATION DIM ON 4 ALPHA PANEL IN COCKPIT. SUSPECT COLD OUTSIDE AIR TEMPERATURES - 35 C AS CAUSE OF PROBLEM. (TC# 2019
- [SDR CA190220025](https://openairdocs.org/sdr/CA190220025.md): Limit Switch · leaking · Feb 9, 2019 · Snias AS350B3
  > (CAN) REPLACEMENT SERVO FOR SDR REPORT 20190207017 LEAKED AFTER 1.5 HOURS OF FLIGHT. LIMIT SWITCH LEAKING HYDRAULIC FLUID. SUSPECT OPERATIONS IN COLD OUTSIDE AIR (- 35 C) TEMPERATURES CAUSING PROBLEM. (TC# 20190220025)
- [SDR YV3R2019021200021](https://openairdocs.org/sdr/YV3R2019021200021.md): Servo · leaking · Feb 7, 2019 · N217DK · Robsin R44
  > CUSTOMER REPORTED OIL LEAK FROM SERVO.
- [SDR YV3R2019021200020](https://openairdocs.org/sdr/YV3R2019021200020.md): Servo · leaking · Feb 7, 2019 · N217DK · Robsin R44
  > CUSTOMER REPORTED OIL LEAK FROM SERVO.
- [SDR YV3R2019021200019](https://openairdocs.org/sdr/YV3R2019021200019.md): Servo · leaking · Feb 5, 2019 · N217DK · Robsin R44
  > CUSTOMER REPORTED OIL LEAK FROM SERVO.
- [SDR AC2R2019060549208](https://openairdocs.org/sdr/AC2R2019060549208.md): Servo · worn · Mar 1, 2018 · N392JS · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR M3XA2018010401](https://openairdocs.org/sdr/M3XA2018010401.md): Servo · leaking · Jan 4, 2018 · N253MT · Urocop EC135P2
  > PL FOR CYCLIC BACK PRESSURE CAUSING RESISTANCE TO PILOT INPUT. PATIENT WAS PICKED UP, ENROUTE, WHEN THE PILOT FELT HIS CYCLIC INPUT HAD REARWARD PRESSURE. PILOT MADE PL AT A HOSPITAL WITHOUT INCIDENT. UPON MECHANICS INSPECTION FOUND COLLECTIVE SERVO LEAKING
- [SDR HEER20171013748](https://openairdocs.org/sdr/HEER20171013748.md): Servo · leaking · Oct 13, 2017 · N947PH · Skrsky S92A
  > THR NR 2 MAIN ROTOR SERVO IS LEAKING AT UPPER PISTON. REPLACED THE NR 2 MAIN ROTOR SERVO ASSEMBLY.
- [SDR AC2R2019060549207](https://openairdocs.org/sdr/AC2R2019060549207.md): Servo · worn · May 2, 2017 · N392JS · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR AC2R2019060549205](https://openairdocs.org/sdr/AC2R2019060549205.md): Servo · worn · Jan 10, 2017 · N292MH · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR HEER20160928327](https://openairdocs.org/sdr/HEER20160928327.md): Bearing · burned · Sep 28, 2016 · N923PH · Skrsky S92A
  > AFTER LOSS OF TAIL ROTOR AUTHORITY PRIOR TO LANDING, MAINTENANCE REMOVED T/R SERVO FOR REPLACEMENT, THE TAIL ROTOR PITCH CONTROL SHAFT AND BEARING WAS FOUND DAMAGED. THE BEARING WAS BURNT AND THE SEAL WAS FOUND INSIDE THE GEARBOX, THE SHAFT WAS DISCOLORED FRO
- [SDR AC2R2019060549204](https://openairdocs.org/sdr/AC2R2019060549204.md): Servo · worn · Sep 11, 2016 · N292MH · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR AC2R2019060549202](https://openairdocs.org/sdr/AC2R2019060549202.md): Servo · worn · Aug 12, 2016 · N921G · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR 2016FA0000274](https://openairdocs.org/sdr/2016FA0000274.md): Servo · failed · Jun 2, 2016 · N866MB · Snias AS350B3
  > M/R SERVO WARNING LIGHT ILLUMINATED ON CAUTION ADVISORY PANEL, AFTER TAKEOFF. PRECAUTIONARY LANDING WAS MADE AT NEARBY AIRPORT. RIGHT LATERAL SERVO WAS REPLACED. ACFT RETURNED TO SERVICE.
- [SDR H4QA20160223001](https://openairdocs.org/sdr/H4QA20160223001.md): Servo · malfunctioned · Feb 22, 2016 · N718MD · Snias AS350B3
  > DURING FLIGHT THE PILOT REPORTED THAT HIS RT TAIL ROTOR PEDAL WOULD PRESS FWD BUT HIS LT PEDAL COULD ONLY TRAVEL TO NEUTRAL POSITION. TOWER WAS CONTACTED & A REQUEST TO PERFORM A STUCK PEDAL LANDING WAS MADE. THE ACFT LANDED SAFELY & THE ENSUING MX INVESTIGA
- [SDR CA160217003](https://openairdocs.org/sdr/CA160217003.md): Servo · leaking · Feb 12, 2016 · Snias AS350B3
  > (CAN) THIS IS THE 4TH SERVO TO LEAK OUT OF THE LIMIT SWITCH AREA IN THE LAST 2 MONTHS WITH VERY LITTLE TIME SINCE REPAIR.
- [SDR CA160128006](https://openairdocs.org/sdr/CA160128006.md): Limit Switch · leaking · Jan 21, 2016 · Urocop EC130B4
  > (CAN) FORWARD RT SERVO WITH LIMIT SWITCH. THE ACTUAL ACFT WAS A B3. 1ST SERVO HAD 72.6 HOURS SINCE O/H, FOUND OIL LEAKING OUT OF TOP, LIMIT SWITCH, AFTER MAINTENANCE FLIGHT. 2ND SERVO HAD 3.4 HRS SINCE REPAIR, FOUND OIL LEAKING OUT OF TOP, LIMIT SWITCH, AFTE
- [SDR 39LA20151206150](https://openairdocs.org/sdr/39LA20151206150.md): Servo · leaking · Dec 6, 2015 · N261F · Skrsky S61N
  > DURING CRUISE FLIGHT, THE FLIGHT CREW SMELLED AN ODOR. THE CREW CHIEF DISCOVERED A HYD LEAK, THE DECISION WAS MADE TO DIVERT. THE FLIGHT CONTINUED WITHOUT FURTHER INCIDENT. R & R AUXILIARY SERVO ASSEMBLY IAW S61N MM 65-44-0.
- [SDR CA151207008](https://openairdocs.org/sdr/CA151207008.md): Servo · leaking · Dec 4, 2015 · Snias AS350B3
  > (CAN) ON DAILY INSPECTION CREWS NOTICED OIL FORMING ON COWLING HINGE UPON REVIEW FOUND SERVO LEAKING FROM THE TOP CAP. ALL THE SERVO`S THAT WE HAVE THAT HAVE LEAKED, ALL LEAKED FROM TOP CAP AND WERE THIS PN SERVO.
- [SDR ZS4R20151012001](https://openairdocs.org/sdr/ZS4R20151012001.md): Bolt · worn · Oct 12, 2015 · Skrsky S76B
  > INPUT LEVER, STOP PIN AND BOLT ARE WORN EXCESSIVELY.
- [SDR HEER20150925719](https://openairdocs.org/sdr/HEER20150925719.md): Servo · failed · Sep 25, 2015 · N933PH · Skrsky S92A
  > LEFT MAIN ROTOR SERVO BLEW OUT SERVO PISTON SEAL. THIS EMPTIED THE NR 2 HYRAULIC PUMP/RESERVOIR MODULE. CREW WAS NOTIFIED BY ILLUMINATION OF THE NR 2 TAIL ROTOR AND MAIN ROTOR SERVO AND HYDRAULIC PUMP AND LOW RESERVOIR LOW FAIL LIGHT. REPLACED UNSERVICEABLE
- [SDR CA150603011](https://openairdocs.org/sdr/CA150603011.md): Servo · failed · Jun 3, 2015 · Aerosp AS355F2
  > (CAN) RIGHT MAIN SERVO PN 31026-110 TSO 0.0 RETURNED FROM OVERHAULED. SERVO INSTALLED ON AIRCRAFT & FAILED ELECTRICAL SERVO FUNCTION TEST. SERVO PN 31026-110 REMOVED UNENVIABLE TSO 0.0. SERVO RETURNED. DESCRIPTION OF DEFECT, SERVO LIMIT WARNING INDICATION
- [SDR AC2R2019060549201](https://openairdocs.org/sdr/AC2R2019060549201.md): Servo · worn · May 17, 2015 · N921GL · Skrsky S92A
  > BEARINGS, LINKAGE AND SLINED PIVOT SHAFT WORN.
- [SDR CA150224021](https://openairdocs.org/sdr/CA150224021.md): O-Ring · leaking · Feb 2, 2015 · Urocop EC130B4
  > (CAN) DURING PERFORMANCE OF P-CHECK, DAILY INSPECTION/AFTER LAST FLIGHT, HYDRAULIC FLUID FOUND LEAKING AT LOAD SENSOR AREA, FROM UNDER CUP ASSY, PN 801540 OF RT MAIN ROTOR SERVO. SERVO MFG COMPONENT MM WITH ILLUSTRATED PARTS BREAKDOWN, 67-39-13, DOES NOT BREA
- [SDR CA140819004](https://openairdocs.org/sdr/CA140819004.md): Servo · malfunctioned · Aug 7, 2014 · Bell 205A1
  > (CAN) WHEN PILOT CARRIED OUT START UP CHECK LIST AT IDLE, A HYDRAULIC SYSTEMS CHECK WAS CARRIED OUT. SYSTEM 2 WAS CLOSED AND CONTROLS FUCTIONED PROPERLY. SYSTEM 2 WAS TURNED ON AND SYSTEM 1 WAS CLOSED. THE COLLECTIVE BEGAN TO RISE SLOWLY. THE TEST WAS CARRI
- [SDR I2WA201407180001](https://openairdocs.org/sdr/I2WA201407180001.md): Control Servo · leaking · Jul 18, 2014 · N197BH · Snias AS350B2
  > DURING CRUISE FLIGHT, THE HYDRAULIC LIGHT ILLUMINATED AND THE HORN CAME ON. THE PILOT SLOWED THE ACFT AIRSPEED AND TURNED THE HYDRAULICS OFF. HE THEN PROCEEDED TO MAKE A RUN ON LANDING AT A PRIVATE AIRPORT. MECHANIC DISCOVERED THERE WAS NO HYDRAULIC FLUID I
- [SDR CA140710007](https://openairdocs.org/sdr/CA140710007.md): Control Rod · worn · Jul 9, 2014 · Agusta AW109SP
  > (CAN) DURING INSPECTION, THE ECS RETURN LINE HAD COME LOSE IN FLIGHT, AND STARTED TO WEAR A HOLE IN TO ONE OF THE MAIN ROTOR SERVO CONTROL RODS. THE ECS LINE IS A 2" ORANGE SCAT HOSE CONNECTED TO THE ECS SYS WITH A STANDARD CLAMP. THE CLAMP WAS INSPECTED AND
- [SDR HCMA2014FA0000434](https://openairdocs.org/sdr/HCMA2014FA0000434.md): Servo · excess play · Jul 3, 2014 · N11QG · Urocop EC130B4
  > DURING A DAILY INSPECTION IT WAS NOTICED THAT THE LEFT HAND SERVO INPUT LEVER HAD LATERAL PLAY. UPON REMOVING THE COVER, IT APPEARS THAT THE SHIM UNDER THE BEARING ASSEMBLY WAS COMING OUT OF THE BORE.
- [SDR QMLA2014042914045](https://openairdocs.org/sdr/QMLA2014042914045.md): Actuator · leaking · Apr 29, 2014 · N145HH · Bolkms BK117C2
  > THE TAIL ROTOR ACTUATOR WAS FOUND SEEPING. THIS ACTUATOR WAS IN SERVICE FOR 146 HOURS, ABOUT THE AVERAGE TIME FOR REPLACEMENT EXPERIENCED AT THIS FACILITY WITH THIS ACFT. THE LEAKAGE RATE EXCEEDS THE LIMITS SPECIFIED IN THE MBB BK117C-2 AMM IAW CH 67-34-00,
- [SDR 39LA2014041570](https://openairdocs.org/sdr/39LA2014041570.md): Servo Control · corroded · Apr 15, 2014 · N505R · Urocop AS365N3
  > MAIN ROTOR SERVO CYLINDER, PN 7112-3B, SN 494 HAS SEVERE INTERGRANULAR CORROSION ON THE LOWER ATTACH POINT.

Next page: https://openairdocs.org/jasc/6730/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 = '6730'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/jasc/6730/reports

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