# Service difficulty reports: Allison 250-C30

A list on [Allison 250-C30](https://openairdocs.org/engine/allison-250-c30.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 9 · 402 reports

- [SDR EVCA03312026](https://openairdocs.org/sdr/EVCA03312026.md): Battery · unserviceable · Mar 25, 2026 · N176AE · Bell 206L1 · Electrical Power System
  > ELECTRICAL FAILURE, COMMS, NAV, AUTO PILOT.
- [SDR EVCA20250623001](https://openairdocs.org/sdr/EVCA20250623001.md): Pump · failed · Jun 23, 2025 · N248AE · Bell 206L3 · Hydraulic Pump (Electric/Engine), Main
  > HYDRAULIC FAILURE
- [SDR EVCA20240903001](https://openairdocs.org/sdr/EVCA20240903001.md): Blower Motor · odor · Sep 2, 2024 · N785AE · Bell 206L4 · Air Distribution Fan
  > STRONG ELECTRICAL BURNING SMELL IN CABIN. TURNED OFF THE AC AND THE SMELL WENT AWAY.
- [SDR EVCA202408120001](https://openairdocs.org/sdr/EVCA202408120001.md): Attach Fitting · cracked · Aug 6, 2024 · N563AE · Bell 206L4 · Rotorcraft Tail Boom
  > UPPER LEFT TAILBOOM ATTACHMENT FITTING, TAILBOOM SIDE, CRACKED FROM EDGE TO EDGE ACROSS TWO FWD OUTBOARD RIVETS
- [SDR EVCA20240810001](https://openairdocs.org/sdr/EVCA20240810001.md): Stiffener · cracked · Jul 31, 2024 · N438AE · Bell 206L4 · Fuselage Miscellaneous Structure
  > THE STATION 145 CLIP IS CRACKED BY A RIVET HOLE ON THE RIGHT HAND SIDE.
- [SDR EVCA20240506001](https://openairdocs.org/sdr/EVCA20240506001.md): Engine · odor · May 3, 2024 · N59AE · Bell 206L1 · Engine (Turbine/Turboprop)
  > ABORT DUE TO STRONG FUEL SMELL WITHIN AIRCRAFT
- [SDR YTRA2024012500001](https://openairdocs.org/sdr/YTRA2024012500001.md): Engine · shutdown · Jan 24, 2024 · N763MH · Skrsky S76A · Engine (Turbine/Turboprop)
  > IN FLIGHT ENGINE SHUTDOWN.
- [SDR YTRA202402020001](https://openairdocs.org/sdr/YTRA202402020001.md): Blades · separated · Jan 24, 2024 · N763MH · Skrsky S76A · Turbine Section
  > IN FLIGHT ENGINE SHUTDOWN. ON TEARDOWN INSPECTION IT WAS DISCOVERED THAT THE 1ST STAGE TURBINE WHEEL BLADES HAD SEPARATED FORM THE BODY OF THE WHEEL. SEE BLOCK 6 BELOW FOR DETAILED INFORMATION ON WHEEL.
- [SDR EVCA202310110001](https://openairdocs.org/sdr/EVCA202310110001.md): Unknown · unknown · Oct 10, 2023 · N53AE · Bell 206L1 · Air Distribution System
  > CREW AND PILOT NOTICED ACRID SMELL IN AIRCRAFT. CREW INITIALLY UNSURE WHETHER IS WAS ENVIRONMENTAL OR INSIDE AIRCRAFT. PILOT SAID SMELL WAS INDICITAVE OF A ELECTRICAL ISSUE OR BURNING WIRES. SMELL SUBSIDED AFTER OPENING WINDOWS. ON THE SUBSEQUENT FLIGHT, THE S
- [SDR EVCA09262023](https://openairdocs.org/sdr/EVCA09262023.md): Frame · cracked · Sep 26, 2023 · N138AE · Bell 206L1 · Fuselage Main, Frame
  > CRACK IN R/H ROLLOVER CLOSE OUT PANEL APPROX 1 INCH LONG EXTENDING TO EDGE OF PANEL. P/N 206-031-117-443. THIS PART WILL PROBABLY HAVE TO BE REMOVED TO REPAIR THE FRAME MIGHT CONSIDER REPLACEMENT OF PANEL IF PROCURABLE.
- [SDR 2023FA0000571](https://openairdocs.org/sdr/2023FA0000571.md): Fuel Cell · abnormal · Sep 14, 2023 · N911WY · Hughes 369FF · Fuel Storage
  > PMA REPLACEMENT FUEL CELL IS CAUSING FUEL TO TURN GREEN. FUEL WAS SENT OUT TO A LAB TO BE TESTED AND TESTS WERE INCONCLUSIVE AS TO THE SUBSTANCE BUT IT IS SUSPECTED TO BE A DYE. THE MANUFACTURE WAS CONTACTED AND DENIES PUTTING ANY DYE IN THE TANK DURING THEIR
- [SDR YV3R2023100200581](https://openairdocs.org/sdr/YV3R2023100200581.md): Wire Harness · malfunctioned · Sep 1, 2023 · N66YP · Robsin R66 · Engine Indicating System Wiring
  > CUSTOMER REPORTED HARNESS ASSEMBLY P/N: F049-012 MALFUNCTIONED, N1 INDICATOR FLUCTUATING DURING FLIGHT.
- [SDR EVCA202303220001](https://openairdocs.org/sdr/EVCA202303220001.md): Pan · leaking · Mar 22, 2023 · N886AE · Bell 206L4 · Engine (Turbine/Turboprop)
  > FUEL SMELL IN AIRCRAFT CABIN. OIL/FUEL SEEP FOUND UNDER ENGINE PAN. CLEANED, INSPECTED, RESEALED ENGINE PAN DRAIN HOLE.
- [SDR 2022F00465](https://openairdocs.org/sdr/2022F00465.md): Hook · failed · Nov 2, 2022 · N511NC · Hughes 369FF · Cargo Compartments
  > DURING SIDE PULL OPERATIONS, THE SIDE PULL HOOK SHAFT ASSEMBLY SHEARED IN HALF AND DEPARTED THE AIRCRAFT. VISUAL INSPECTIONS INDICATE METALLURGY ISSUES IN THE APPARENT MATERIAL. THE HOOK HAS BEEN SENT OUT FOR FURTHER DAMAGE EVALUATION TO DETERMINE CAUSE OF FA
- [SDR EVCA20220825001](https://openairdocs.org/sdr/EVCA20220825001.md): Unknown · odor · Aug 24, 2022 · N239AE · Bell 206L1 · Air Distribution System
  > FUEL SMELL IN HOVER AND WHEN BANKING RIGHT. PILOT COULD NOT SMELL FUEL. ONE CREW CAN SMELL FUEL IN AFT CABIN. NO FUEL LEAKS PRESENT. CANNOT SEAL HOSE ON END TO LEAK CHECK
- [SDR 2020FA0000167](https://openairdocs.org/sdr/2020FA0000167.md): Fuel Cell · leaking · Aug 11, 2021 · N557CP · Hughes 369FF · Fuel Storage
  > LEFT FUEL CELL DEVELOPED LEAK DUE TO RUBBING WITH VERTICAL SUPPORTS AT CENTER BEAM STRUCTURE. INSTALLED ANTI-CHAFF TAPE TO ALL VERTICAL STIFFENERS. REPLACED FUEL CELL WITH REPAIRED LEFT CELL. NOTED THAT THE LAST SEVERAL NEWER MANUFACTURED HELICOPTERS LACKED
- [SDR YV3R2020092900355](https://openairdocs.org/sdr/YV3R2020092900355.md): Dual Tachometer · defective · Sep 24, 2020 · N801GT · Robsin R66 · Main Rotor Indicating System
  > CUSTOMER REPORTED DUAL TACHOMETER ASSEMBLY P/N: F792-1 NEEDLES STICK OCCASIONALLY DURING START-UP.
- [SDR EVCA202009183](https://openairdocs.org/sdr/EVCA202009183.md): Combustion Liner · cracked · Sep 17, 2020 · N334AE · Bell 206L3 · Turbine Engine Combustion Section
  > DURING INSPECTION, CRACKS WERE VISUALLY FOUND ON THE ENGINE COMBUSTION LINER.
- [SDR YV3R201911220214](https://openairdocs.org/sdr/YV3R201911220214.md): Sensor · defective · Nov 5, 2019 · N593KM · Robsin R66 · Standard Practices/Structures
  > CUSTOMER REPORTED SENSOR ASSEMBLY P/N: G768-3 IS DEFECTIVE.
- [SDR 2020FA0000043](https://openairdocs.org/sdr/2020FA0000043.md): Ring · cracked · Jul 18, 2019 · N800VK · Robsin R66 · Engine (Turbine/Turboprop)
  > DURING AN ANNUAL INSPECTION OF THE AIRFRAME AND 200HR INSPECTION OF THE ENGINE, A CRACK IN THE SLINGER RING DISK OF THE ENGINE SHAFT WELDMENT WAS DISCOVERED. THE CRACK ANIMATES FROM A MANUFACTURING HOLE IN THE SLINGER RING DISK AND MOVES TOWARDS THE CENTER WH
- [SDR CA190814007](https://openairdocs.org/sdr/CA190814007.md): Clamp · ruptured · Jul 17, 2019 · Robsin R66 · Starter-Generator
  > (CAN) INITIAL INSTALLATION OF STARTER/GENERATOR P/N: RR30000412, WITH ORIGINAL QAD CLAMP ALWAYS INSTALLED IN ACCORDANCE WITH MANUFACTURER RECOMMENDATIONS OPERATORS MAINTENANCE MANUAL 80-11-10-400-801. DURING THE FIRST ENGINE CRANK AFTER STARTER/GEN INSTALLATIO
- [SDR CA190403018](https://openairdocs.org/sdr/CA190403018.md): Mount · cracked · Apr 3, 2019 · Robsin R66 · Battery Box Structure
  > (CAN) BATTERY MOUNTING SHELF PN G249-1 FOUND CRACKED AT CONTACT WITH BATTERY FWD AND AFT OUTBOARD CORNERS. (TC# 20190403018)
- [SDR DXMR20200219163](https://openairdocs.org/sdr/DXMR20200219163.md): Bearing · seized · Mar 4, 2019 · N557CP · Hughes 369FF · Main Rotor Mast/Swashplate
  > DURING EXTREME COLD WEATHER, SWASHPLATE UNIBALL SEIZED ON M/R DRIVESHAFT CAUSING STIFF COLLECTIVE FORCES.
- [SDR H44R2016051300001](https://openairdocs.org/sdr/H44R2016051300001.md): Cover Plate · worn · May 11, 2016 · N532EZ · Hughes 369FF · Engine/Transmission Coupling
  > DURING REPLACEMENT OF THE OVER RUNNING CLUTCH, A SPECIAL TOOL IS REQUIRED TO TORQUE THE INTERNAL WRENCHED RETENTION NUT INSIDE THE PTO SHAFT OF THE ENGINE. WHEN THE TOOL WAS WITHDRAWN PART OF IT REMAINED STUCK IN THE NUT, THE TECH DID NOT REALIZE THAT THIS HA
- [SDR 2016FA0000011](https://openairdocs.org/sdr/2016FA0000011.md): Angle · cracked · Dec 30, 2015 · N530KK · Hughes 369FF · Fuselage Miscellaneous Structure
  > THE ANGLE HAS CRACKED ON ALL OF OUR ACFT. THE ANGLE IS RIVETED AND SCREWED INTO PLACE DIRECTLY BEHIND THE LOWER LT ENGINE MOUNT. CAUSE OF THE CRACK IS UNKNOWN, VIBRATION LEVELS WERE WITHIN ACCEPTABLE LEVELS AND NO UNUSUAL WEAR WAS NOTED. POSSIBLE CAUSE IS
- [SDR CA151009003](https://openairdocs.org/sdr/CA151009003.md): Shaft · seized · Oct 8, 2015 · Skrsky S76A · Turbine Governor
  > (CAN) WHILE TROUBLESHOOTING, AN UNCOMMANDED TORQUE OSCILLATION IN FLIGHT WHICH WAS DISCOVERED TO BE A TURBINE PROBLEM, THE ANOMALY WITH THE RECENTLY REPLACED GOVERNOR WAS DISCOVERED. THE SHAFT/POINTER ON THE GOVERNOR WAS FOUND SEIZED. WITH AN ABNORMAL AMOUNT
- [SDR CA151005009](https://openairdocs.org/sdr/CA151005009.md): Line · collapsed · Oct 2, 2015 · Skrsky S76A · Aircraft Fuel Distribution System
  > (CAN) INLET HOSE FOR FUEL, COLLAPSED CAUSING THE NR 1 ENGINE TO FLAMEOUT.
- [SDR CA150706012](https://openairdocs.org/sdr/CA150706012.md): Jam-Nut · loose · Jun 24, 2015 · Bell 206L4 · Main Rotor Control
  > (CAN) DURING ARRIVAL INSPECTION, ONE OF THE MR PITCH CHANGE LINKS WAS FOUND TO HAVE BOTH THE UPPER & LOWER JAM NUTS LOOSE. THE UPPER NUT HAD THE REQUIRED SAFETY BUT NO TORQUE ON EITHER END OF THE LINK.
- [SDR HQPR2015FA0000080](https://openairdocs.org/sdr/HQPR2015FA0000080.md): Drive Gear · failed · Feb 26, 2015 · N922SD · Hughes 369E · Engine (Turbine/Turboprop)
  > DURING FLIGHT PILOT NOTICED A N2 PERCENT ROTOR/ENGINE TACHOMETER FLUCTUATION. OPERATING PERCENT IS 103.0 PERCENT AND WOULD INCREASE 1 TO 2 PERCENT ABOVE OR 1 TO 2 PERCENT BELOW DEPENDING ON THE POSITION OF THE COLLECTIVE WHEN APPLYING OR DECREASING POWER DEMA
- [SDR EVCA20140717001](https://openairdocs.org/sdr/EVCA20140717001.md): Mount · corroded · Jul 12, 2014 · N117AE · Bell 206L1 · Engine Mount Section
  > DURING ACFT ENG CHANGE MX NOTED LT & RT ENG MOUNT LEGS, PN 206-064-106-101 & 206-064-107-103 SEVERELY CORRODED & REQUIRES REPLACEMENT.
- [SDR CA140627013](https://openairdocs.org/sdr/CA140627013.md): Turbine Wheel · failed · Jun 26, 2014 · Robsin R66 · Turbine Section
  > (CAN) DURING FLIGHT, THE PILOT HEARD AN ABNORMAL NOISE, SAW N1 AND N2 FLUCTUATIONS AND OBSERVED A CHIP LIGHT. HE LANDED IMMEDIATELY USING ENGINE POWER. THE HELICOPTER WAS TRANSPORTED FOR TROUBLESHOOTING. THE OIL SYS WAS FLUSHED. DURING THE SUBSEQUENT GROUN
- [SDR CA140627014](https://openairdocs.org/sdr/CA140627014.md): Nut · missing · Jun 25, 2014 · Bell 407 · Turbine Section
  > (CAN) TURBINE ATTACH HARDWARE FOUND LOOSE AND 1 MISSING.
- [SDR Y3AR2014FA0000403](https://openairdocs.org/sdr/Y3AR2014FA0000403.md): Combustion Case · leaking · Jun 18, 2014 · Turbine Engine Combustion Section
  > OUTER COMBUSTION CASE FOUND TO BE LEAKING AT WIRE MESH PATCH COVERING BUTT WELD DURING OUTER COMBUSTION CASE PRESSURE TEST.
- [SDR CA140509006](https://openairdocs.org/sdr/CA140509006.md): Nut · cracked · May 6, 2014 · Robsin R66 · Main Landing Gear
  > (CAN) DURING FIRST 100 HR INSPECTION, SPOTTED GAP, VISIBLE BOLT SHANK, BETWEEN AIRFRAME MOUNTED SPHERICAL BEARING AND F239-2, RT AFT LANDING GEAR STRUT ASSY. FURTHER INSPECTION REQUIRED REMOVING STRUT FAIRING, AND BONDED RAIN CAP TO GAIN ACCESS TO THE NUT. F
- [SDR YTRA20140313001](https://openairdocs.org/sdr/YTRA20140313001.md): Engine · making metal · Mar 12, 2014 · N171RL · Bell 206L4 · Engine (Turbine/Turboprop)
  > THE PILOT MADE A PRECAUTIONARY LANDING DUE TO AN ENG CHIP LIGHT ILLUMINATION.
- [SDR 8MHR201311050001](https://openairdocs.org/sdr/8MHR201311050001.md): Combustion Liner · failed · Nov 5, 2013 · Turbine Engine Combustion Section
  > THE COMBUSTION LINER FAILED. THE TABS HOLDING THE AFT OUTER SKIRT FAILED, ALLOWING THE SKIRT TO SEPARATE, AND 2 OF THE TABS WERE INGESTED IN THE TURBINE CAUSING SERIOUS DAMAGE. ALL 4 TURBINE WHEELS HAVE FOD AND ARE SCRAP. THE TURBINE HAS APPROXIMATELY 800 HO
- [SDR 2013FA0000574](https://openairdocs.org/sdr/2013FA0000574.md): Diffuser · cracked · Sep 6, 2013 · Turbine Engine Compressor Section
  > ENGINE WAS MAKING A HIGH PITCHED NOISE. REMOVED ENGINE ASSY AND DISASSEMBLED. FOUND COMPRESSOR DIFFUSER VANE ASSY CRACKED IN SEVERAL SPOTS AT THE BRAZE JOINTS. THIS PART WAS O/H 529.2 HRS BEFORE. THIS IS THE 3RD VANE ASSY WE HAVE FOUND LIKE THIS. PROBABLE
- [SDR CA131022003](https://openairdocs.org/sdr/CA131022003.md): Swashplate · damaged · Jul 31, 2013 · Robsin R66 · Main Rotor Mast/Swashplate
  > (CAN) DURING A 100 HR INSPECTION, WE HAVE FOUND THAT 2 ALLEN BOLTS FROM THE SWASHPLATE WAS CHAFING ON THE SLIDER TUBE. THE DAMAGE WAS LOCATED ON THE FORWARD FACE OF THE TUBE. FOUND THAT THIS CONDITION HAPPEN DURING FLIGHT CONTROLS CHECK WITH THE COLLECTIVE U
- [SDR AC2A07907102013](https://openairdocs.org/sdr/AC2A07907102013.md): Compressor · stalled · Jul 10, 2013 · N31079 · Bell 206L3 · Turbine Engine Compressor Section
  > DURING CLIMB OUT, WHILE PASSING THROUGH 200 FT, THE HELICOPTER EXPERIENCED A COMPRESSOR STALL. TORQUE READINGS WERE MAXED OUT AND THE ACFT EXPERIENCED A RT THEN LT YAW.
- [SDR ALGA050820137398](https://openairdocs.org/sdr/ALGA050820137398.md): Strap · deteriorated · May 7, 2013 · N267AL · Bell 206L4 · Main Rotor System
  > FOUND STRAP MATERIAL DETERIORATED AND WIRES EXPOSED ON STRAP.
- [SDR 2012FA0000814](https://openairdocs.org/sdr/2012FA0000814.md): Skin · cracked · Dec 7, 2012 · N27M · Bell 206L4 · Fuselage Main, Plate/Skin
  > 1" CRACK ON LT SIDE OF TRANSMISSION UPPER CABIN ROOF SHELL STARTING AT A ROW OF RIVETS, SECOND INBD RIVET FS 146.3, LBL APPROX 8.65. REPAIRED IAW REPAIR NR 12RL-113.
- [SDR 2012FA0000769](https://openairdocs.org/sdr/2012FA0000769.md): Longeron · cracked · Nov 7, 2012 · N47MA · Bell 206L3 · Fuselage Main, Longeron/Stringer
  > CRACK FOUND ON LONGERON, ORIGINATING FROM UPPER FWD OTBD RIVET AT BS 228.
- [SDR ALGA2012110729129](https://openairdocs.org/sdr/ALGA2012110729129.md): Unknown · unknown · Nov 6, 2012 · N271AL · Bell 206L4 · Engine RPM Indicating System
  > ON INITIAL ROLL UP OF THROTTLE, THE RPM WAS NOTED AS WELL ABOVE 101 PERCENT AND WAS "BEEPED" DOWN TO 100 PERCENT. FIVE MINUTES INTO THE FLIGHT THE RPM WAS NOTED TO BE WELL BELOW LOWER REDLINE APPROX 98 PERCENT. ATTEMPTED TO BEEP THE RPM UP BUT WAS UNSUCCESS
- [SDR H5FA2012F00177](https://openairdocs.org/sdr/H5FA2012F00177.md): Blade · bent · Oct 3, 2012 · N911FF · Bell 206L3 · Tail Rotor Blades
  > TAIL ROTOR BLADE T/E SKIN DEFORMED AT CORDWISE BALANCE WEIGHT.
- [SDR AC2A201210010001](https://openairdocs.org/sdr/AC2A201210010001.md): Combustion Case · cracked · Oct 1, 2012 · N39LR · Bell 206L1 · Turbine Engine Combustion Section
  > AFTER APPROACH TO INTRACOASTAL, WHILE IN A HOVER, BEGAN RIGHT PEDAL TURN TO TAXI TO THE PAD. LOOKED AT TORQUE GAUGE BEFORE BEGINNING RIGHT PEDAL TURN. TORQUE WAS 60 PERCENT-70 PERCENT. AS I BEGAN RIGHT PEDAL TURN, CROSS-CHECKED TORQUE GAUGE AND SAW A TORQUE S
- [SDR EVCA201207300033](https://openairdocs.org/sdr/EVCA201207300033.md): Structure · delaminated · Jul 30, 2012 · N233AE · Bell 206L3 · Fuselage Miscellaneous Structure
  > FOUND DELAMINATION ON FWD TUB DURING INSPECTION.
- [SDR AC2A66K07172012](https://openairdocs.org/sdr/AC2A66K07172012.md): B-Nut · loose · Jul 17, 2012 · N7266K · Skrsky S76A · Aircraft Fuel Distribution System
  > NR 1 ENGINE FUEL PRESSURE WARNING LIGHT ILLUMINATED IN FLIGHT. FOLLOWED EMERGENCY PROCEDURES CHECKLIST AND RETURNED TO BASE. MX FOUND A LOOSE B-NUT ON PRESSURE SWITCH. B-NUT WAS TIGHTENED AND AIRCRAFT WAS GROUND RUN AND LEAK CHECKED.
- [SDR EVCA201206270031](https://openairdocs.org/sdr/EVCA201206270031.md): Collector · cracked · Jun 19, 2012 · N48EA · Bell 206L3 · Engine Collector/Tailpipe/Nozzle
  > ON ROUTINE INSPECTION FOUND CRACKS IN THE REPAIR WELDS ON THE ENGINE EXHAUST COLLECTOR ASSEMBLY.
- [SDR ALGA2012060802](https://openairdocs.org/sdr/ALGA2012060802.md): Oil System · low pressure · Jun 4, 2012 · N707AL · Skrsky S76A · Engine Oil Indicating System
  > AFTER TAKEOFF, NR 2 ENGINE OIL PRESSURE LIGHT ILLUMINATED WITH CORRESPONDING LOW PRESSURE ON GAUGE. NR 2 CHIP LIGHT ILLUMINATED ON FINAL APPROACH BACK TO PATTERSON BASE. NR 2 ENGINE BECAME VERY ERRATIC, SURGING WITH TORQUE FLUCTUATIONS, AND T5 FLUCTUATIONS.
- [SDR 2012F00097](https://openairdocs.org/sdr/2012F00097.md): Blade · dented · May 4, 2012 · N307MH · Bell 206L3 · Tail Rotor Blades
  > DAILY AIRCRAFT CHECK NOTED DENTS ON TAIL ROTOR BLADES OUTER SURFACE. NON-SHARP DENTS ON OTBD FACE OF BOTH BLADES. NO INDICATION OF STRIKE TO BLADE L/E.

Next page: https://openairdocs.org/engine/allison-250-c30/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 engine_model_key = '250C30'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/allison-250-c30/reports

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