# Service difficulty reports: Allison 250-C20

A list on [Allison 250-C20](https://openairdocs.org/engine/allison-250-c20.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 19 · 945 reports

- [SDR 2026FA0000472](https://openairdocs.org/sdr/2026FA0000472.md): Lock Nut · failed · May 28, 2026 · N774CB · Hughes 369E · Engine (Turbine/Turboprop)
  > MS20143 NUTS ARE UTILIZED TO SECURE WITHIN THE ENGINE ASSEMBLY THE FOLLOWING ARTICLES COMPRESSOR, TURBINE, FUEL CONTROL, GOVERNOR, FUEL PUMP, TACH GENERATORS, GEARBOX SPLIT LINE, AND HAVE BEEN FOUND NUMEROUS OCCASIONS BACKING OFF. THE MS21043 NUTS HAVE BEEN R
- [SDR EVCA07192021](https://openairdocs.org/sdr/EVCA07192021.md): Control Unit · malfunctioned · Jul 19, 2021 · N108AE · Bell 206L1 · Battery/Charger System
  > RECENTLY INSTALLED SYSTEM TRUE BLUE BATTERY WAS GETTING A RED TEMP HOT CAUTION LIGHT FOR THE AIRCRAFT BATTERY WHEN THE STARTER BUTTON WAS PRESSED. THE BATTERY WOULD NOT PHYSICALLY BE HOT BUT THE TEMP LIGHT WOULD ILLUMINATE ABOVE 3% N1 AND EXTINGUISH BELOW 3% N
- [SDR QMLA2020052820022](https://openairdocs.org/sdr/QMLA2020052820022.md): Duct · loose · May 26, 2020 · N911AL · Bell 407 · Heating System
  > DURING CRUISE FLIGHT, CREW AND PATIENT COMPLAINED OF CARBON MONOXIDE POISONING SYMPTOMS INCLUDING LIGHT HEADEDNESS, SLEEPINESS AND HEADACHE. HEATER WAS IN OFF POSITION, BOTH SWITCHES, BUT HEAT AND FUMES WERE COMING FROM HEATER VENT IN AFT COMPARTMENT OF AIRCRA
- [SDR QMLA2019112299087](https://openairdocs.org/sdr/QMLA2019112299087.md): Engine · making metal · Nov 19, 2019 · N911AL · Bell 407 · Engine (Turbine/Turboprop)
  > DURING ROUTINE INSPECTION OF ENGINE CHIP DETECTORS FOUND NUMEROUS CHIPS AND DEBRIS ON BOTH UPPER AND LOWER CHIP PLUGS. AMOUNT AND SIZE EXCEEDED ALLOWABLE PER ROLLS ROYCE C47-250 EMM. *** THIS AIRCRAFT REMAINS OOS AT THE TIME OF THIS SUBMISSION TO REPLACE THIS
- [SDR CA190716009](https://openairdocs.org/sdr/CA190716009.md): Gyro · faulty · Jun 29, 2019 · Bell 206B · Directional Gyro and Indicating System
  > (CAN) IT WAS REPORTED TO BELL:SHORTLY AFTER TAKEOFF, SMOKE STARTED TO FILL THE COCKPIT. THE PILOT TURNED OFF THE BATTERY, OPENED THE SIDE WINDOW, AND MADE AN EMERGENCY LANDING BACK AT THE POINT OF DEPARTURE. ONCE ALL ELECTRICAL POWER HAD BEEN TURNED OFF, INCLU
- [SDR 2019FA0000194](https://openairdocs.org/sdr/2019FA0000194.md): Engine · making metal · Jun 25, 2019 · N808JH · Hughes 369E · Powerplant System
  > ENGINE CHIP LIGHT ILLUMINATED WHEN ENGINE WAS BROUGHT TO FLIGHT IDLE AFTER ENGINE START UP. MAINTENANCE FOUND 2 FLAKES WITHIN LIMITS ON THE UPPER CHIP PLUG.A 30 MINUTE GROUND RUN WAS PERFORMED, THE PLUGS WERE INSPECTED AGAIN AND FOUND CLEAN. AIRCRAFT RETURNED
- [SDR CA190409008](https://openairdocs.org/sdr/CA190409008.md): Blade · mismanufactured · Mar 26, 2019 · Bell 206B · Main Rotor Blades
  > (CAN) UPON INSTALLATION OF A SET OF NEW MAIN ROTOR BLADES IT WAS DISCOVERED THE ALIGNMENT PIN WAS MISSING FROM ONE OF THE NEW BLADES. PART NUMBER 206-010-200-151 AND COULD NOT BE INSTALLED ONTO THE AIRCRAFT. AFTER CONTACTING THE BELL TECHNICAL REP. HE THEN DIR
- [SDR X2RA2018F00000](https://openairdocs.org/sdr/X2RA2018F00000.md): Fuel Control · failed · Dec 14, 2017 · N240FL · Hughes 369D · Fuel Control/Turbine Engines
  > PILOT EXPERIENCED DELAYED HOT AND ERRATIC STARTS. FOUND PLAY IN THE POINTER ROD, THIS WOULD AFFECT THE START SCHEDULING. THE SLOP IS WHERE THE POINTER ROD ENGAGES THE THROTTLE ARM. AT TIMES THE THROTTLE SEEMED AS IF IT WERE HITTING A STOP. FIRST START OK,
- [SDR HDNA20160917012](https://openairdocs.org/sdr/HDNA20160917012.md): Engine · making metal · Sep 17, 2016 · N911WK · Bolkms BO105CBS · Engine (Turbine/Turboprop)
  > AT CRUISE, THE MAG PLUG 2 WARNING LIGHT ILLUMINATED. REDUCED POWER TO ESTABLISH A SUITABLE OEI CONDITION AND CALLED FOR THE APPLICABLE RFM EMERGENCY PROCEDURE CHECKLIST. AN ATTEMPT WAS MADE TO EXTINGUISH THE WARNING LIGHT WITH NO SUCCESS. PERFORMED A SINGLE EN
- [SDR K2DA20160308001](https://openairdocs.org/sdr/K2DA20160308001.md): Blade · delaminated · Mar 5, 2016 · N506PH · Hughes 369E · Tail Rotor Blades
  > UPON THE DAILY INSPECTION, A COIN TAP TEST WAS PERFORMED ON THE TAIL ROTOR BLADES. TAIL ROTOR BLADE, PN 500P3100-105, SN C519 WAS DISCOVERED TO BE DELAMINATED. THE DELAMINATION CONSISTS OF A 1.5 INCH AREA OF THE LE ABRASION STRIP ON THE OTBD SIDE OF THE BLAD
- [SDR 9EK2016F00000](https://openairdocs.org/sdr/9EK2016F00000.md): B-Nut · loose · Feb 15, 2016 · N730TS · Bolkms BO105S · Turbine Engine Oil System
  > FOUND B-NUT LOOSE ON ENGINE THAT ATTACHES RETURN OIL LINE TO RESERVOIR. LINE DOES NOT HAVE ANY SAFETYING PROVISION. METAL FITTING ASSY WAS FOUND LOOSE NOT HOSE.
- [SDR 2016FA0000076](https://openairdocs.org/sdr/2016FA0000076.md): Blade · delaminated · Feb 9, 2016 · N506PH · Hughes 369E · Tail Rotor Blades
  > UPON THE DAILY INSPECTION, A COIN TAP TEST WAS PERFORMED ON THE TAIL ROTOR BLADES AND BLADE WAS DISCOVERED TO BE DELAMINATED. THE DELAMINATION CONSISTS OF A 2" AREA OF THE L/E ABRASION STRIP ON THE OTBD SIDE OF THE BLADE AND A 1" AREA OF THE L/E ABRASION STRI
- [SDR K2DA20160107001](https://openairdocs.org/sdr/K2DA20160107001.md): Blade · delaminated · Dec 31, 2015 · N506PH · Hughes 369 · Tail Rotor Blades
  > DURING DAILY INSPECTION, AFTER THE DAYS FLIGHTS, ONE OF THE TAIL ROTOR BLADES WAS FOUND TO HAVE VARIOUS SPOTS, VARYING IN LENGTH FROM.5 INCHES TO 2 INCHES, WHERE THE LE WAS DELAMINATING FROM THE BLADE, PN 500P3100-105, SN C700. WE TAP TEST THE LE DAILY.
- [SDR DCGA2015FA0000622](https://openairdocs.org/sdr/DCGA2015FA0000622.md): Engine · making metal · Dec 3, 2015 · N808JH · Hughes 369E · Engine (Turbine/Turboprop)
  > PILOT GOT AN INTERMITTENT ENGINE CHIP LIGHT INDICATION AFTER TAKEOFF AND RETURNED FOR LANDING. MAINTENANCE FOUND LIGHT EXTINGUISHED BUT FOUND METAL ON UPPER AND LOWER ENGINE CHIP PLUGS. ENGINE WAS REMOVED FROM THE ACFT FOR FURTHER INSPECTION.
- [SDR 8MHR2015FA0000422](https://openairdocs.org/sdr/8MHR2015FA0000422.md): Nozzle · fractured · Aug 24, 2015 · Engine (Turbine/Turboprop)
  > ENGINE WAS REPORTED TO HAVE N1 LOCKUP. ON DISASSEMBLY OF THE TURBINE, FOUND 6 OF THE 8 LOCATING TANGS SEPARATED FROM THE SECOND STAGE NOZZLE.
- [SDR QMLA2015081415072](https://openairdocs.org/sdr/QMLA2015081415072.md): Skin · cracked · Aug 14, 2015 · N911AL · Bell 407 · Fuselage Main, Plate/Skin
  > FOUND CRACK IN UPPER AFT FUSELAGE SKIN NEAR THE UPPER LT LONGERON AS DESCRIBED, THE SUBJECT OF AD2015-05-04 & ASB 407-11-95, TB 407-12-96. DURING THE COMPLIANCE WITH AMC EO-13-5310-EO-212. CRACK IS APPROX 1.5" LONG, STARTING AT THE UPPER LT LONGERON & TRAVEL
- [SDR ALGA0730201536129](https://openairdocs.org/sdr/ALGA0730201536129.md): Bearing · worn · Jul 15, 2015 · N487AL · Bell 407 · Turbine Section
  > DURING CRUISE FLIGHT ENGINE CHIP LIGHT ILLUMINATED. LANDED ON AN OFFSHORE PLATFORM, EXAMINED CHIP PLUG FOUND METAL PARTICLES. UPON RECOVERY OF AIRCRAFT & SUBSEQUENT TEAR DOWN OF ENGINE, THE NATURE OF THE PROBLEM WAS DETERMINED TO BE THE NUMBER FIVE BEARING I
- [SDR K2DA20150602001](https://openairdocs.org/sdr/K2DA20150602001.md): Pump · failed · May 31, 2015 · N508PH · Hughes 369E · Main Rotor Gearbox
  > DURING CRUISE FLIGHT THE MAIN ROTOR TRANSMISSION LOW OIL PRESS LIGHT ELIMINATED. AN UNSCHEDULED PRECAUTIONARY LANDING WAS MADE IN AN OPEN FIELD WITHOUT INCIDENT. FOLLOWED MM TROUBLESHOOTING PROCEDURES & FOUND THE MAIN ROTOR TRANSMISSION OIL PUMP FAULTY. REP
- [SDR K2DA2015FA0000256](https://openairdocs.org/sdr/K2DA2015FA0000256.md): Pump · failed · May 31, 2015 · N508PH · Hughes 369E · Main Rotor Gearbox
  > DURING CRUISE FLIGHT, THE MAIN ROTOR TRANSMISSION LOW OIL PRESSURE LIGHT ELIMINATED. AN UNSCHEDULED PRECAUTIONARY LANDING WAS MADE IN AN OPEN FIELD WITHOUT INCIDENT. FOLLOWED MM TROUBLE SHOOTING PROCEDURES AND FOUND THE MAIN ROTOR TRANSMISSION OIL PUMP FAULT
- [SDR DCGA2015FA0000217](https://openairdocs.org/sdr/DCGA2015FA0000217.md): Turbine · out of tolerance · May 19, 2015 · N808JH · Hughes 369E · Turbine Section
  > PILOT REPORTED CHIRPING NOISE FROM ENGINE AT END OF DAY SHUTDOWN. MAINTENANCE REMOVED TURBINE ASSY FOR SUSPECT N2 RUBBING.
- [SDR QMLA2015041515029](https://openairdocs.org/sdr/QMLA2015041515029.md): Heater · pilot error · Apr 15, 2015 · N911AL · Bell 407 · Heating System
  > FLIGHT CREW SMELLED HOT PLASTIC IN AFT CABIN AREA WHILE HEATER WAS IN USE. THIS IS AN ELECTRICALLY ACTUATED SYS, OPERATED BY THE PILOT. IF PILOT SELECTED SETTINGS ARE TOO HIGH, THE HEATER CAN RUN VERY HOT TO THE AFT CABIN, SEPARATELY FROM THE COCKPIT, THIS W
- [SDR HDNA201502190004](https://openairdocs.org/sdr/HDNA201502190004.md): Engine · making metal · Feb 19, 2015 · N911LF · Bolkms BO105CB* · Engine (Turbine/Turboprop)
  > ON STARTUP NR 1 ENG CHIP LIGHT ILLUMINATED. UPON INSPECTION OF CHIP DETECTORS FOUND UPPER DETECTOR TO HAVE EXCESSIVE AMOUNTS OF METAL. R & R TURBINE.
- [SDR 2015FA0000049](https://openairdocs.org/sdr/2015FA0000049.md): Scissors · unserviceable · Jan 30, 2015 · N82LF · Aerosp AS355F2 · Main Rotor Mast/Swashplate
  > INSTALLED THE O/H SCISSORS LINK AND WAS NOTIFIED BY THE CUSTOMER THAT ON A ROUTINE ALF CHECKS, ON THE ROTATING SCISSORS LINK THAT ABLE ENGINEERING HAD RE-BUSHED AND REFINISHED AT CONSIDERABLE COST AND DELAY, THE UPPER ATTACHMENT TO MAST FITTING EXHIBITED SOME
- [SDR 2015FA0000003](https://openairdocs.org/sdr/2015FA0000003.md): Bladder · leaking · Jan 8, 2015 · N454JH · Doug MD500E · Fuel Storage
  > SMALL PUDDLE OF FUEL FOUND ON THE GROUND UNDER THE BELLY OF THE ACFT AT PREFLIGHT. MAINTENANCE FOUND A SMALL PUNCTURE IN THE RT FUEL BLADDER OF AN UNCONFIRMED ORIGIN.
- [SDR FTYRN201410180001](https://openairdocs.org/sdr/FTYRN201410180001.md): Combustion Case · cracked · Oct 27, 2014 · N64JB · Bell 206B3 · Turbine Engine Combustion Section
  > NOTED A HIGH TOT INDICATION ON APPROACH TO LAND AT HOME STATION. VISUALLY INSPECTED AND FOUND CRACK IN OUTER COMBUSTION CASE ASSEMBLY.
- [SDR CA140903012](https://openairdocs.org/sdr/CA140903012.md): Bearing · rough · Aug 24, 2014 · Hughes 369D · Tail Rotor Control System
  > (CAN) AFTER LANDING AND DURING ENGINE WIND DOWN, A LOUD SQUEAL WAS HEARD COMING FROM THE AFT OF THE HELICOPTER. IT WAS DETERMINED THAT THE NOISE WAS EMANATING FROM THE TAIL ROTOR PITCH CONTROL BEARINGS. THE TAIL ROTOR PITCH CONTROL LINKS WERE DISCONNECTED AN
- [SDR K2DA20140701001](https://openairdocs.org/sdr/K2DA20140701001.md): Pressure Switch · faulty · Jul 1, 2014 · N506PH · Hughes 369E · Main Rotor Gearbox
  > MAIN ROTOR TRANSMISSION LOW OIL PRESS LIGHT ILLUMINATED IN FLIGHT PREFORMED PRECAUTIONARY LANDING. TRANSMISSION OIL PRESS SWITCH INOPERATIVE. REPLACED PRESS SWITCH RAN ENG, OPERATIONS CHECKED GOOD & LEAK CHECKED GOOD, RETURNED TO SERVICE.
- [SDR IAVA201406110001](https://openairdocs.org/sdr/IAVA201406110001.md): Combustion Case · cracked · May 30, 2014 · N1197 · Bell 407 · Turbine Section
  > OUTER COMBUSTION CASE CRACKED ON THE RT SIDE UNDER WIRE REINFORCEMENT PATCH.
- [SDR K2DA20140427001](https://openairdocs.org/sdr/K2DA20140427001.md): Shaft · worn · Apr 27, 2014 · N508PH · Hughes 369E · Main Rotor Gearbox
  > TRANSMISSION OIL PRESS LIGHT DURING FLIGHT. PRECAUTIONARY LANDING PREFORMED. TRANSMISSION OIL PUMP INPUT SHAFT NOT PROPERLY SEATED & WORN. REPLACED INPUT SHAFT PN 10807-2 IAW MD CSP-COM-5 CH 63-20-25. PERFORMED GND RUN & LEAK CHECK. RETURNED TO SERVICE.
- [SDR DCGA2014042500280](https://openairdocs.org/sdr/DCGA2014042500280.md): Wire · shorted · Apr 23, 2014 · N808JH · Hughes 369E · Engine Indicating System Wiring
  > PILOT REPORTED AN ENGINE CHIP LIGHT. THE CHIP LIGHT WAS EXTINGUISHED WHEN CHIP PLUGS WERE REMOVED AND CLEANED. DURING OPS CHECKS THE LIGHT CAME BACK ON. MAINTENANCE ULTIMATELY DISCOVERED A SHORTING WIRE IN THE LOWER ENGINE CHIP DETECTOR CONNECTOR. THE BAD P
- [SDR WO5A2014042100261](https://openairdocs.org/sdr/WO5A2014042100261.md): Bearing · failed · Apr 1, 2014 · N888SD · Hughes 369E · Fuel Control/Turbine Engines
  > OPERATOR EXPERIENCED ERRATIC ENGINE OPERATION INCLUDING INABILITY TO LIGHT OFF AS WELL AS UNCOMMANDED INCREASES IN N2 & NR SPEEDS. PILOT REPORTED THAT DURING LANDING FROM A HOVER TAXI, NOTICED N2 AND NR RISING AND ROLLED THE THROTTLE TO IDLE AT WHICH TIME THE
- [SDR CA130812003](https://openairdocs.org/sdr/CA130812003.md): Blade · damaged · Aug 10, 2013 · Bell 206B · Main Rotor Blades
  > (CAN) IN CRUISE FLIGHT THE PILOT NOTICED A CHANGE IN BLADE NOISE, LIKE PLASTIC BAG ON BLADE, WAS APPROXIMATELY 1 MILE FROM THE BASE, SHUTDOWN THE ACFT, AND CHECKED THE BLADES, FOUND YELLOW MAIN-ROTOR BLADE, SN A-7716 TIP CAP NOT FLUSH WITH THE BLADE, BUT THE
- [SDR CA130612006](https://openairdocs.org/sdr/CA130612006.md): Ecu · failed · Jun 5, 2013 · Bell 407 · Fuel Control/Turbine Engines
  > (CAN) 11 PM LOCAL TIME. THE PILOT MADE A NORMAL OUTBOUND FLIGHT AND SHUTDOWN AT A TRAUMA SCENE. 5 MINUTES INTO A 10 MINUTE RETURN FLIGHT THE FADEC DEGRADE LIGHT, AUTO RELIGHT LIGHT CAME ON WITH ALL OTHER INDICATIONS NORMAL FADEC REMAINED IN AUTO MODE. THE PI
- [SDR CA130509006](https://openairdocs.org/sdr/CA130509006.md): Elt · failed · May 9, 2013 · Bell 206B · Emergency Locator Beacon
  > (CAN) ELT FAILED POWER OUTPUT TEST FOR 121.5 MHZ AND 406 MHZ. UNIT FLASHED CODE INDICATING LO RF POWER. POWER CONFIRMED WITH BEACON TEST EQUIPMENT. ELT BATTERY DUE 01/2015.
- [SDR JBZA20130513003](https://openairdocs.org/sdr/JBZA20130513003.md): Blade · damaged · May 7, 2013 · N22RX · Agusta A109 · Main Rotor Blades
  > WHILE ENROUTE, ACFT HAD A BIRD STRIKE AT THE MAIN ROTOR SYS CAUSING A VIBRATION. CREW MADE A PRECAUTIONARY LANDING AT THE NEAREST AIRPORT. AFTER SHUTDOWN, PILOT INSPECTED THE ACFT AND FOUND 1 OF THE MAIN ROTOR-BLADES DAMAGED AT THE TIP OF THE BLADE FROM THE T
- [SDR CA130502011](https://openairdocs.org/sdr/CA130502011.md): Gearbox · making metal · May 2, 2013 · Bell 206B · Accessory Gearboxes
  > (CAN) ENGINE GEARBOX WAS O/H 7.6 HRS IN SERVICE AND THE PILOT REPORTED AN ENGINE CHIP LIGHT. UPON FURTHER INVESTIGATION OF THE CHIP PLUG, IT APPEARS TO BE A DRILL BIT THAT WAS LEFT IN THE GEARBOX DURING THE O/H PROCESS. IN THE PROCESS OF CHANGING THE ENGINE
- [SDR AQH2013F00000](https://openairdocs.org/sdr/AQH2013F00000.md): Starter Gen · failed · Mar 11, 2013 · N555PP · Bell 206B · Starter-Generator
  > DURING NORMAL FLIGHT, THE PILOT REPORTED THE GENERATOR FAILED. THE HELICOPTER LANDED WITHOUT INCIDENT. SUBSEQUENT INVESTIGATION BY THE PILOT INDICATED THE STARTER GENERATOR WAS NOT TURNING WHEN THE ENGINE WAS ROTATED. UPON REMOVAL IT WAS VERIFIED THE STARTE
- [SDR 2013FA0000553](https://openairdocs.org/sdr/2013FA0000553.md): Bulkhead · cracked · Jan 22, 2013 · Bell 206B3 · Rotorcraft Tail Boom
  > BULKHEAD CRACKED IN LT AFT GEARBOX ATTACHMENT HOLE. CRACKING FOUND VISUALLY DURING CORROSION INSPECTION.
- [SDR CA130110005](https://openairdocs.org/sdr/CA130110005.md): Governor · malfunctioned · Jan 9, 2013 · Bell 206B · Fuel Control/Turbine Engines
  > (CAN) PREFLIGHT INSPECTION OF ACFT REVEALED GOVERNOR BIASING SHAFT, PN 206-062-717-1, ON TRANSMISSION DECK TWISTED AT SHEAR POINT. LINEAR ACTUATOR ARM REMOVED AT GOVERNOR ARM, PN 206-061-107-3, TO INSPECT FOR BINDING. GOVERNOR ARM/SHAFT SEIZED. SERVICEABLE B
- [SDR CA130109010](https://openairdocs.org/sdr/CA130109010.md): Housing · failed · Jan 7, 2013 · Turbine Engine Compressor Section
  > (CAN) THE BEARING HOUSING WAS REMOVED FROM COMPRESSOR ASSEMBLY DUE TO LOW POWER, AND WAS INDUCTED INTO THE SHOP. BEARING HOUSING AND NUT, WITH SHEARED PORTION OF THREADED STUD. THE SMALL LINE OF CLEAN METAL CAN BE SEEN, AND THAT IS ALL THAT EXISTED TO RETA
- [SDR 2013FA0000552](https://openairdocs.org/sdr/2013FA0000552.md): Bulkhead · cracked · Dec 17, 2012 · Bell 206B3 · Rotorcraft Tail Boom
  > BULKHEAD CRACKED IN LT AFT GEARBOX ATTACHMENT HOLE. CRACKING WAS FOUND VISUALLY DURING CORROSION INSPECTION.
- [SDR CA121205011](https://openairdocs.org/sdr/CA121205011.md): Elt · malfunctioned · Dec 5, 2012 · Bell 206B · Emergency Locator Beacon
  > (CAN) DURING THE SELF TEST OF THE ELT USING THE REMOTE SWITCH THE SYSTEM RESPONDED WITH AN ERROR CODE OF 3+2 FLASHES INDICATING A LOW RF POWER FAULT. FAULT WAS CONFIRMED DURING BENCH TEST. THE ELT WAS LAST RECERTIFIED JUNE 06, 2012 AND HAD FLOWN 195.7 HOURS
- [SDR CA121203008](https://openairdocs.org/sdr/CA121203008.md): Heater · shorted · Dec 1, 2012 · Bell 206B · Heating System
  > (CAN) SHROUD HEATER NOT WORKING. HEATER CIRCUIT BREAKER TRIPPED. HEATER MOTOR ROUGH TO TURN AND SHORTING OUT INTERNALLY. MOTOR REPLACED.
- [SDR CA121023008](https://openairdocs.org/sdr/CA121023008.md): Encoder · failed · Oct 19, 2012 · Bell 206B · Altimeter, Barometric/Encoder
  > (CAN) ATC REPORTED THAT ACFT WAS NOT REPORTING MODE C. INSPECTION OF ENCODER FOUND WATER ON THE CIRCUIT BOARD WHICH LEAD TO A SHORT. ENCODER REPLACED. MAINTENANCE PERSONNEL WILL INSPECT ACFT FOR ENTRY SOURCE OF WATER.
- [SDR CA121010010](https://openairdocs.org/sdr/CA121010010.md): Pin · failed · Oct 10, 2012 · Bell 206B · Tail Rotor System
  > (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 CA120905008](https://openairdocs.org/sdr/CA120905008.md): Drive Shaft · overtemp · Sep 5, 2012 · Bell 206B · Tail Rotor Drive Shaft
  > (CAN) DURING 100 HR INSPECTION THE DRIVESHAFT TELI-TEMP INDICATORS SHOWED DRIVESHAFT COUPLING WAS OVERTEMPED. DRIVESHAFT RAN 151 HOURS SINCE LAST O/H.
- [SDR CA120905010](https://openairdocs.org/sdr/CA120905010.md): Starter Gen · noisy · Sep 5, 2012 · Bell 206B · Starter-Generator
  > (CAN) NOISE IN ACFT AUDIO SYS WHEN STARTER GENERATOR SWITCHED ON. STARTER GENERATOR REPLACED.
- [SDR K2DA201209070502](https://openairdocs.org/sdr/K2DA201209070502.md): Engine · warning light · Sep 2, 2012 · N506PH · Hughes 369E · Engine (Turbine/Turboprop)
  > ENGINE CHIP LIGHT ILLUMINATED DURING FLIGHT. PRECAUTIONARY LANDING PERFORMED AND ENGINE SHUTDOWN. MX DISPATCHED WITH COMPANY ACFT AND PASSENGERS WERE FLOWN FOR CONTINUATION OF THE FLIGHT. CHIP DETECTORS SHOWED METAL PARTICLES ON THE LOWER CHIP PLUG OF MEDIU
- [SDR CA120905012](https://openairdocs.org/sdr/CA120905012.md): Fuel Control · failed · Aug 25, 2012 · Bell 206B · Fuel Control/Turbine Engines
  > (CAN) DURING START, ALL NRS AND TEMPERATURES WERE NORMAL AT 40 PERCENT N1 ENGINE FLAMED OUT AS IF FUEL WAS CUTOFF. FUEL CONTROL REPLACED.
- [SDR CA120905009](https://openairdocs.org/sdr/CA120905009.md): Governor · malfunctioned · Aug 23, 2012 · Bell 206B · Turbine Governor
  > (CAN) GOVERNOR WILL NOT RECOVER FROM OVERSPEED WHEN COLLECTIVE DECREASED.

Next page: https://openairdocs.org/engine/allison-250-c20/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 = '250C20'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/allison-250-c20/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.