# Service difficulty reports: JASC 6300

A list on [JASC 6300](https://openairdocs.org/jasc/6300.md).

Reports filed under 6300 · Main Rotor Drive System, newest first.

Page 1 of 13 · 637 reports

- [SDR QMLA2026091420065](https://openairdocs.org/sdr/QMLA2026091420065.md): Chip Detector · inoperative · Sep 14, 2026 · N429HF · Bell 429
  > XMSN CHIP DETECTOR INOP CAME ON TWICE IN FLIGHT AND WENT OUT BEFORE LANDING, DURING RETURN LEG TO BASE, AFTER HALFWAY POINT. INSPECTED LH TRANSMISSION CHIP DETECTOR, VERIFIED CONDITION AND SECURITY. COULD NOT DUPLICATE.
- [SDR 2026FA0000648](https://openairdocs.org/sdr/2026FA0000648.md): Coupling · cracked · Aug 17, 2026 · N4247V · Skrsky S58JT
  > CRACKED AROUND METAL ON COUPLING
- [SDR 8HBR20260830086](https://openairdocs.org/sdr/8HBR20260830086.md): Sprag Clutch · damaged · Aug 10, 2026 · N924SH · Robsin R22BETA
  > PILOTS FOUND A TEAR IN ONE OF THE DRIVE V-BELTS. UPON INSPECTION OF THE CLUTCH ASSEMBLY, THE UPPER SHEAVE HAD A SHARP STEP WORN INTO IT. AFTER DISASSEMBLY OF THE SPRAG CLUTCH DAMAGE WAS FOUND ON THE CLUTCH AND ONE OF THE CLUTCH SHAFT BEARINGS.
- [SDR EVCA202607011](https://openairdocs.org/sdr/EVCA202607011.md): Warning Light · false activation · Jul 1, 2026 · N728AE · Bell 407
  > DEPARTED HOSPITAL, XSMN CHIP LIGHT ILLUMINATED APPROX 2 MIN AFTER DEPARTURE. ABORTED FLIGHT, CONDUCTED PRECAUTIONARY EMERGENCY LANDING AT AIRPORT. REMOVED AND INSPECTED UPPER AND LOWER TRANS AND FREE WHEELING CHIP DETECTORS, REMOVED AND CHECKED FILTER, AND FOU
- [SDR QMLA2026032720024](https://openairdocs.org/sdr/QMLA2026032720024.md): Warning Message · illuminated · Mar 27, 2026 · N819LF · Urocop EC135P2
  > TRANSMISSION CHIP CAUTION ILLUMINATED MULTIPLE TIMES WHILE IN CRUISE FLIGHT. CAUTION REMAINED ON FOR LAST 3 MINUTES OF FLIGHT.
- [SDR 2026FA0000086](https://openairdocs.org/sdr/2026FA0000086.md): Sprag Assy · slipped · Feb 5, 2026 · N745B · Doug 600N
  > THE REPAIR STATION REPORTED COMPLETION OF AN OVERHAUL ON AN OVERRUNNING CLUTCH ASSY, OVERHAUL RECORDS INDICATE THAT BEARING P/N 369F5457-1 WAS INSTALLED IN LIEU OF THE SPECIFIED 369F5457-3. OVERHAUL DOCUMENTATION FURTHER INDICATES THAT POST OVERHAUL RUN-IN TES
- [SDR 2025FA0000701](https://openairdocs.org/sdr/2025FA0000701.md): Sheave · worn · Oct 10, 2025 · N115LE · Robsin R22BETAII
  > UPPER ANODIZED SHEAVE P/N A170-1 WORN. REQUIRES REPLACEMENT OF CLUTCH SHAFT ASSEMBLY P/N A018-1
- [SDR 2025FA0000700](https://openairdocs.org/sdr/2025FA0000700.md): Sheave · worn · Oct 10, 2025 · N150LE · Robsin R22BETAII
  > UPPER ANODIZED SHEAVE WORN. REQUIRES REPLACEMENT OF CLUTCH SHAFT ASSEMBLY.
- [SDR HEEA202501070001](https://openairdocs.org/sdr/HEEA202501070001.md): Gearbox · chipped · Jan 2, 2025 · N393PH · Bolkms BK117D2EURO
  > AFTER LEVEL OFF AT 6000' OUTBOUND, APPROXIMATELY 15NM SOUTH OF HOUMA, MGB CHIP CAUTION CAME ON. PERFORMED "CHIP PULSE" PER THE CHECKLIST WITH NO EFFECT. RETURNED TO HOUMA AND CONTACTED MAINTENANCE.
- [SDR 2025FA0000698](https://openairdocs.org/sdr/2025FA0000698.md): Sheave · worn · Sep 24, 2024 · N3040K · Robsin R22BETAII
  > UPPER ANODIZED SHEAVE WORN. REQUIRES REPLACEMENT OF CLUTCH SHAFT ASSEMBLY.
- [SDR 2024FA0000495](https://openairdocs.org/sdr/2024FA0000495.md): Clutch · making metal · Jul 9, 2024 · N842JH · Hughes 369E
  > DURING AIRCRAFT INSPECTION AN AIRCRAFT MECHANIC QUESTIONED DISCOLORING OF THE OVERRUNNING CLUTCH OUTPUT BEARING GREASE. THE BEARING DID NOT DEMONSTRATE ANY ABNORMAL PLAY OR ROUGHNESS. THE CLUTCH HAD THE CORRECT AMOUNT OF OIL INSTALLED. IT WAS DECIDED TO DISAS
- [SDR M3XA2024070130009](https://openairdocs.org/sdr/M3XA2024070130009.md): Transmission · making metal · Jun 30, 2024 · N516MT · Bell 407
  > PILOT REPORTED A MAIN XMSN CHIP LIGHT IN FLIGHT AND PERFORMED A PRECAUTIONARY LANDING IN MANHATTAN, KS WITHOUT INCIDENT. MECHANIC INSPECTED ALL 3 CHIP DETECTORS AND FOUND NOTHING VISIBLE ON THE CHIP DETECTORS. XMSN IS CURRENTLY IN PROCESS OF REPLACEMENT DUE
- [SDR M3XA20240629008](https://openairdocs.org/sdr/M3XA20240629008.md): Transmission · making metal · Jun 29, 2024 · N516MT · Bell 407
  > PILOT REPORTED A MAIN XMSN CHIP LIGHT IN FLIGHT AND PERFORMED A PRECAUTIONARY LANDING WITHOUT INCIDENT. MECHANIC INSPECTED ALL 3 CHIP DETECTORS AND FOUND ONLY SOME FUZZ ON THE LOWER SUMP CHIP DETECTOR. PERFORMED A SERVICEABILITY CHECK AND MOC WITH NO FURTH
- [SDR QMLA2024010320001](https://openairdocs.org/sdr/QMLA2024010320001.md): Unknown · unknown · Jan 2, 2024 · N958AL · Urocop EC135T2
  > XMSN CHIP LIGHT ILLUMINATED WHILE IN CRUISE FLIGHT. I CHECKED THE TRANSMISSION OIL PRESSURE WHICH SEEMED TO BE FLUCTUATING +/- 0.2 PSI. I WAS LESS THAN A MILE FROM SPOKANE INTERNATIONAL AIRPORT AND, GIVEN THE INDICATIONS I HAD, DECLARED AN EMERGENCY AND LANDED
- [SDR 2023FA122200001](https://openairdocs.org/sdr/2023FA122200001.md): Transmission · installed · Dec 19, 2023 · N716KV · Hughes 369E
  > DURING A 135 TOUR OPERATION EXPERIENCED A MAIN ROTOR TRANSMISSION CHIP LIGHT RESULTING IN A PRECAUTIONARY LANDING. ANOTHER HELICOPTER WAS BROUGHT IN WITH MAINTENANCE PERSONNEL AND BROUGHT ALL PASSENGERS BACK TO THE AIRPORT. THE MAIN ROTOR CHIP DETECTORS WERE I
- [SDR QMLA2023120520111](https://openairdocs.org/sdr/QMLA2023120520111.md): Transmitter · unknown · Dec 2, 2023 · N145HH · Bolkms BK117C2
  > DURING RETURN FLIGHT FROM BAYSTATE HOSPITAL BACK TO BASE, WHILE OVER BRADLEY AIRPORT (KBDL) THE RIGHT-SIDE MAIN ROTOR TRANSMISSION PRESSURE INDICATION DROPPED TO 0. LANDING WAS PERFORMED AT KBDL MANAGEMENT, OCC, AND MAINT. WHERE THEN NOTIFIED.
- [SDR YV3R2023120100591](https://openairdocs.org/sdr/YV3R2023120100591.md): Actuator · defective · Nov 20, 2023 · Robsin R22BETAII
  > CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: A051-1 DOES NOT RETRACT WHEN SWITCH IS TURNED TO THE OFF POSITION AFTER FLIGHT.
- [SDR 2025FA0000699](https://openairdocs.org/sdr/2025FA0000699.md): Sheave · worn · Oct 4, 2023 · N552LE · Robsin R22BETAII
  > UPPER ANODIZED SHEAVE P/N A170-1 WORN. REQUIRES REPLACEMENT OF CLUTCH SHAFT ASSEMBLY P/N A018-1
- [SDR 2023F00338](https://openairdocs.org/sdr/2023F00338.md): Link · unknown · Aug 29, 2023 · N53ZA · Bell 206L4
  > PILOT REPORTED HEARING A LOUD (THUMP NOISE) WHEN THE AIRCRAFT WAS PICKED UP TO A HOVER DURING REPOSITIONING FROM ONE HELI-PAD TO ANOTHER @ KJRB OPERATIONS. WHEN THE TECH TEAM WAS DISPATCHED, THEY DISCOVERED THE BOTTOM AFT LH LIFT LINK HAVING EXCESSIVE PLAY.
- [SDR YV3R2023092900579](https://openairdocs.org/sdr/YV3R2023092900579.md): Actuator · defective · Aug 25, 2023 · Robsin R44RAVENII
  > CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 ONLY HAD ONE TENSION PLATE WORKING.
- [SDR 2023FA0000664](https://openairdocs.org/sdr/2023FA0000664.md): Bearing Race · cracked · Aug 24, 2023 · N530WH · Hughes 369F
  > F-DUTCH OUTER RACO PIN 369F5453-1 SIN 5640-0834 WAS ROTUMED FROM NDE PROFESSIONALS. INC. AS REJECTED DUO TO THREE MARKED CRACKS. ONE RUNNLNG THE LENGTH OF THE SPLINE.
- [SDR QR9R2023080900007](https://openairdocs.org/sdr/QR9R2023080900007.md): Transducer · failed · Aug 9, 2023 · Bolkms BK117C2
  > AFTER 2 HOURS INTO FLIGHT #1 TRANSMISSION PRESSURE INDICATION WENT TO.7 THEN TO NORMAL (CENTER OF BLACK), THEN WENT TO ZERO THEN BACK TO NORMAL. REDUCTION OF PRESSURE AND LANDING HAD NO CHANGE. REDUCING TO IDLE THEN TO 100% YIELDED NO CHANGE OF INDICATIONS. A
- [SDR QMLA2023080620058](https://openairdocs.org/sdr/QMLA2023080620058.md): Transmission · unknown · Aug 5, 2023 · N408LN · Bell 407
  > TRANSMISSION CHIP LIGHT ILLUMINATED IN FLIGHT. FOUND INSIGNIFICANT DEBRIS, AS DEFIED IN BELL MM, CHAPTER 63.
- [SDR QMLA2023072520055](https://openairdocs.org/sdr/QMLA2023072520055.md): Transmission · making metal · Jul 25, 2023 · N223AM · Bell 407
  > XMSN CHIP LIGHT CAME ON DURING CRUISE FLIGHT.
- [SDR 8HBR20230730053](https://openairdocs.org/sdr/8HBR20230730053.md): Seal · faulty · Jun 5, 2023 · N924SH · Robsin R22
  > +DURING A 100 HOUR INSPECTION IT WAS FOUND THAT THE AFT SPRAG CLUTCH SEAL WAS MIGRATING OUT OF THE RETAINER HOUSING.
- [SDR YV3R2023071000575](https://openairdocs.org/sdr/YV3R2023071000575.md): Clutch · faulty · May 30, 2023 · Robsin R44
  > CUSTOMER REPORTED HEAVY YAW MOVEMENTS WITH LOUD NOISES, C018-4 CLUTCH ASSEMBLY HAS ALUMINUM AND STEEL PARTICLES IN OIL.
- [SDR YV3R2023061400571](https://openairdocs.org/sdr/YV3R2023061400571.md): Switch · defective · May 19, 2023 · Robsin R44
  > CUSTOMER REPORTED SWITCHES ASSEMBLY P/N: C053-2 HAS LOOSE CONNECTIONS.
- [SDR YV3R2023061400569](https://openairdocs.org/sdr/YV3R2023061400569.md): Actuator · defective · May 18, 2023 · N938SH · Robsin R22BETAII
  > CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: A051-1 STOPS AND STARTS WHEN UNDER LOW COMPRESSION.
- [SDR 2023F00149](https://openairdocs.org/sdr/2023F00149.md): Module · chipped · May 18, 2023 · N950PH · Skrsky S92A
  > APPROXIMATELY 18 MILES FROM KHUM THE #2 INPUT CHIP LIGHT ILLUMINATED. EMERGENCY PROCEDURES WERE PERFORMED AND WE CONTINUED TO RWY 18. WE PERFORMED A ROLL ON LANDING AND TAXIED TO THE LINE.
- [SDR YV3R2023051000566](https://openairdocs.org/sdr/YV3R2023051000566.md): Actuator · defective · Apr 28, 2023 · Robsin R22BETAII
  > CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: A051-1 SPRINGS ARE NOT WORKING.
- [SDR QMLA2023042520033](https://openairdocs.org/sdr/QMLA2023042520033.md): Transmission · unknown · Apr 24, 2023 · N208AM · Bell 407
  > WHILE IN CRUISE FLIGHT, TRANSMISSION CHIP DETECTOR LIGHT ILLUMINATED ALONG WITH A CAUTION LIGHT AND AUDIBLE ALERT.LANDED IMMEDIATELY AND MX INSPECTED CHIP DETECTORS. FOUND FERROUS METAL FLAKE MATERIAL ON MGB CHIP PLUG (LOWER) AND DETERMINED TO BE SIGN OF NORMA
- [SDR YV3R2023042700556](https://openairdocs.org/sdr/YV3R2023042700556.md): Actuator · defective · Apr 5, 2023 · N476AT · Robsin R22BETAII
  > CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: A051-1 OPERATES INTERMITTENTLY.
- [SDR QMLA2023031520014](https://openairdocs.org/sdr/QMLA2023031520014.md): V-Belt · unknown · Mar 15, 2023 · N240SH · Urocop EC130T2
  > PL DUE TO ILLUMINATION OF SERVO AND HYD2 CAUTION LIGHT. CAUTION LIGHTS ILLUMINATED WHILE AT CRUISE FLIGHT. PL CONDUCTED TO THE NEAREST AIRPORT. POST FLIGHT INSPECTION REVEALED THE BELT FOR THE BELT-DRIVEN HYDRAULIC PUMP HAD SEPARATED.
- [SDR HDNA20230222001](https://openairdocs.org/sdr/HDNA20230222001.md): Swashplate · cracked · Feb 21, 2023 · N117CH · Bolkms BK117B1
  > DURING THE PERFORMANCE OF A DAILY AIRWORTHINESS CHECK THE MAIN ROTOR SWASHPLATE SUPPORT WAS FOUND CRACKED. CRACKS ARE NOT ALLOWED ON THIS COMPONENT.
- [SDR 2023F00059](https://openairdocs.org/sdr/2023F00059.md): Transmission · chipped · Feb 18, 2023 · N418PH · Bell 407
  > DURING CRUISE, TRANSMISSION CHIP LIGHT ILLUMINATED. AT APPROXIMATELY 1310 IN CRUISE FLIGHT AT 1250FT ENROUTE TO EI11H, THE TRANSMISSION CHIP LIGHT ILLUMINATED. THE STUDENT FLYING RELINQUISHED THE CONTROLS TO ME. I MADE A MAYDAY CALL AND DECLARED AN EMERGENCY T
- [SDR YV3R2023031500552](https://openairdocs.org/sdr/YV3R2023031500552.md): Actuator · defective · Feb 16, 2023 · Robsin R44RAVENII
  > CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 FAILED SWITCH TEST.
- [SDR QR9R2023020700002](https://openairdocs.org/sdr/QR9R2023020700002.md): Transmitter · warning light · Feb 7, 2023 · Bolkms BK117C2
  > UPON STARTING THE #1 ENGINE, #1 TRANSMISSION OIL PRESSURE INDICATED 0. #2 OIL PRESSURE WAS 1.4. REMOVED AND REPLACED #1 TRANSMISSION OIL PRESSURE TRANSMITTER IAW AMM 63-41-00, 4-4. RUNUP COMPLETED IAW AMM 05-60-00, 6-12. TRANSMISSION PRESSURE NORMAL.
- [SDR QMLA2023011120003](https://openairdocs.org/sdr/QMLA2023011120003.md): Friction Ring · damaged · Jan 6, 2023 · N493LG · Snias AS350B3
  > FOUND ON PRE-FLIGHT SUSPECT MOVEMENT BETWEEN SWASHPLATE UNI-BALL AND MAST AT TEFLON OUTER FRICTION RING. THE CORRECTIVE ACTION TAKEN BY THE MECHANIC ON DUTY AT THE TIME WAS “REMOVED TORN PEEL SHIM FROM TOP OF SWASHPLATE ASSEMBLY. REASSEMBLED TOP OF ROTATING R
- [SDR YV3R2022092300541](https://openairdocs.org/sdr/YV3R2022092300541.md): Sheave · defective · Sep 15, 2022 · Robsin R22BETAII
  > CUSTOMER REPORTED SHEAVE (LOWER) P/N: A493-1 HAS BUBBLING UNDER METALIZING MATERIAL.
- [SDR QMLA2022082920059](https://openairdocs.org/sdr/QMLA2022082920059.md): None · none · Aug 26, 2022 · N916LH · Airbus A300*
  > DURING CRUISE FLT M/T CHIP CAUTION ILLUMINATED. 30 SECONDS LATER BATT DISCONNECT CAUTION ILLUMINATED. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE ARRIVED, REMOVED / INSPECTED / CLEANED M/T CHIP PLUG, FOUND CATEGORY "C" CHIP. SAVED CHIP AND OIL ANALY
- [SDR QR9R20220801001](https://openairdocs.org/sdr/QR9R20220801001.md): Filter · damaged · Aug 1, 2022 · Bolkms BK117C2
  > AFTER RECEIVING PART FROM SUPPLY AND PRIOR TO INSTALLATION, MAINTENANCE DETECTED THE FILTER ASSEMBLY MATING SURFACE WAS DAMAGED BEYOND LIMITS.
- [SDR YV3R2022091300534](https://openairdocs.org/sdr/YV3R2022091300534.md): Actuator · defective · Jul 28, 2022 · Robsin R22BETAII
  > CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: A051-1 WAS INTERMITTENT IN OPERATION.
- [SDR EVCA202207220002](https://openairdocs.org/sdr/EVCA202207220002.md): Mast · corroded · Jul 22, 2022 · N726AE · Bell 407
  > CORROSION FOUND INSIDE MAST DURING 12 MONTH INSPECTION
- [SDR 8HBR20220722045](https://openairdocs.org/sdr/8HBR20220722045.md): Seal · faulty · Jul 20, 2022 · N8340S · Robsin R22BETA
  > PILOT FOUND THE AFT SPRAG CLUTCH SEAL MIGRATED OUT OF THE RETAINER DURING HIS POST FLIGHT INSPECTION.
- [SDR EVCA202207220001](https://openairdocs.org/sdr/EVCA202207220001.md): Mast · corroded · Jul 20, 2022 · N715AE · Bell 407
  > CORROSION FOUND INSIDE MAST DURING 12 MONTH INSPECTION
- [SDR EVCA2022072100001](https://openairdocs.org/sdr/EVCA2022072100001.md): Mast · corroded · Jul 20, 2022 · N196AE · Bell 407
  > CORROSION FOUND INSIDE MAST ON 12 MONTH INSPECTION
- [SDR QMLA2022071220040](https://openairdocs.org/sdr/QMLA2022071220040.md): Gearbox · warning light · Jul 11, 2022 · N563AM · Snias AS350B2
  > WE WERE RETURNING TO BASE AFTER COMPLETING AN INTERFACILITY TRANSFER. WE WERE FLYING ALONG, MINDING OUR OWN BUSINESS WHEN THE MGB CHIP LIGHT ILLUMINATED. I IMMEDIATELY STARTED LOOKING FOR A SAFE PLACE TO CONDUCT A PRECAUTIONARY LANDING. FOUND AN OPEN LIT AREA
- [SDR QMLA2022051620028](https://openairdocs.org/sdr/QMLA2022051620028.md): None · used · May 13, 2022 · N357AM · Bell 407
  > INTERMITTENT TRANSMISSION CHIP LIGHT. TRANSMISSION CHANGED OUT AT ACFT TT 2605+37 ON DATE 4/21/2022. INSPECTED CHIP DECTETECTORS FOUND SMALL A SLIVER OF METAL ON LWR CHIP DETECTOR. CLEANED ALL CHIP DETECTORS. DRAINED AND RESERVICED TRANSMISSION FUILDS. REMOVED
- [SDR QR9R20220420001](https://openairdocs.org/sdr/QR9R20220420001.md): Brake Pads · damaged · Apr 20, 2022 · Bolkms BK117C2
  > AIRCRAFT RESTRICTED FROM USE OF ROTOR BRAKE DUE TO ROTOR BRAKE TOOK EXCESSIVE AMOUNT OF TIME, 3 MINUTES (25-50 SECONDS NORMAL STOPPING TIME 05-60-00,6-1) TO STOP MAIN ROTOR SYSTEM. UPON INVESTIGATION FOUND PIECES OF ROTOR BRAKE PADS LYING ON DECK, BRAKE DISC G
- [SDR 2022F00174](https://openairdocs.org/sdr/2022F00174.md): Drive Gear · crushed · Mar 31, 2022 · N352EV · Snias AS350B2
  > DURING A GROUND RUN IN PREPARATION FOR A FERRY FLIGHT, THE PILOT FELT A SIGNIFICANT VIBRATION IN THE AIRFRAME ACCOMPANIED BY AN ABNORMAL NOISE AND MGB CHIP CAUTION LIGHT. THE PILOT PERFORMED A NORMAL ENGINE SHUTDOWN AND INFORMED MAINTENANCE PERSONNEL. UPON R

Next page: https://openairdocs.org/jasc/6300/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 = '6300'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/jasc/6300/reports

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