# Service difficulty reports: Allison 250-C20F

A list on [Allison 250-C20F](https://openairdocs.org/engine/allison-250-c20f.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 2 · 87 reports

- [SDR TLLA205070200139](https://openairdocs.org/sdr/TLLA205070200139.md): Engine · making metal · Jun 26, 2025 · N355TH · Aerosp AS355F1 · Engine (Turbine/Turboprop)
  > #1 ENGINE CHIP LIGHT ILLUMINATED DURING FLIGHT. PILOT LANDED AT FIRST SAFEST SPOT AT SOUTHWEST WYOMING REGIONAL AIRPORT WITH NO INCIDENT. GROUNDED AC. SENT MECHANIC OUT AND FOUND CHIPS ON UPPER MAG. PLUG ON GEARBOX
- [SDR CA190528012](https://openairdocs.org/sdr/CA190528012.md): Gearbox · making metal · May 24, 2019 · Aerosp AS355F2 · Main Rotor Gearbox
  > (CAN) MAIN GEARBOX BEVEL REDUCTION (MGB) CHIP LIGHT ON AIRCRAFT STARTUP, AIRCRAFT GROUNDED. DURING STARTUP PILOT NOTICED, MGB CHIP LIGHT ILLUMINATED. PILOT SHUTDOWN, AND INSPECTED ALL MGB CHIP PLUGS. THE LOWER MGB CHIP PLUG CONTAINED A LARGE CHIP. A PICTURE
- [SDR H0CR2018050101](https://openairdocs.org/sdr/H0CR2018050101.md): Compressor · delaminated · Apr 26, 2018 · Aerosp AS355F2 · Turbine Engine Compressor Section
  > NR 1 AND 2 ENGINE POWER CHECKS WERE TRENDING DOWN. DURING ROUTINE 300HR/12MONTH INSPECTION, FOUND EXCESSIVE DELAMINATION OF THE LINING OF THE COMPRESSOR CASE HALVES ON THE ENGINES. REPLACED THE WORN CASE HALVES, AND PERFORMED POWER CHECKS, RESULTS WERE IMPROV
- [SDR CA150603011](https://openairdocs.org/sdr/CA150603011.md): Servo · failed · Jun 3, 2015 · Aerosp AS355F2 · Rotorcraft Servo System
  > (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 CA150411001](https://openairdocs.org/sdr/CA150411001.md): Control Cable · frozen · Mar 11, 2015 · Aerosp AS355F1 · Power Lever
  > (CAN) AIRCRAFT WAS PARKED OUTSIDE ON COLD MORNING. DURING START, PIC NOTED NOT BEING ABLE TO BRING ENGINES FROM IDLE TO FLIGHT RPM. SUBSEQUENT INSPECTION OF CONTROL SYSTEM FOUND MOISTURE PENETRATED AND FROZE INSIDE THE FLEXIBLE CONTROL CABLE RENDERING IT INO
- [SDR VMIA201506101671](https://openairdocs.org/sdr/VMIA201506101671.md): Bearing · failed · Jan 26, 2015 · N709AC · Aerosp AS355F1 · Turbine Engine Compressor Section
  > ENGINE FAILURE INFLIGHT DUE TO COMPRESSOR BEARING NR 2 FAILURE.
- [SDR CA111125001](https://openairdocs.org/sdr/CA111125001.md): Line · cracked · Nov 18, 2014 · Aerosp AS355F1 · Turbine Engine Oil System
  > (CAN) FLARED END OF OIL PRESSURE DELIVERY TUBE CRACKED UNDER FERRULE, CAUSING OIL PRESSURE LOSS AND SUBSEQUENT IN-FLIGHT SHUTDOWN OF RT ENGINE. US REG NR N355AG INCIDENT OCCURED 18 NOV 2011 ENGINE RECEIVED 23 NOV 2011 CRACK DISCOVERED 23 NOV 2011.
- [SDR 2014F00158](https://openairdocs.org/sdr/2014F00158.md): Fire Warning · activated · Sep 25, 2014 · N102UM · Aerosp AS355E · Fire Detection
  > LEFT ENGINE FIRE LIGHT ILLUMINATED IN FLIGHT.
- [SDR CA150108008](https://openairdocs.org/sdr/CA150108008.md): Bearing · failed · Jul 9, 2014 · Aerosp AS355F1 · Engine (Turbine/Turboprop)
  > (CAN) ENGINE CHIP LIGHT ILLUMINATED. FOUND NR 5 BEARING BRINELLED.
- [SDR CA130603019](https://openairdocs.org/sdr/CA130603019.md): Shaft · damaged · May 23, 2013 · Aerosp AS355F2 · Fuel Control/Turbine Engines
  > (CAN) IN FLIGHT SURGE ON NR 1 ENGINE DURING MAINTENANCE OPERATIONS, THE FCU WAS REMOVED AND FOUND INPUT SHAFT DAMAGED.
- [SDR 2012FA0000808](https://openairdocs.org/sdr/2012FA0000808.md): Servo Control · worn · Dec 10, 2012 · N58020 · Aerosp AS355F1 · Rotorcraft Servo System
  > DURING THE ACCIDENT INVESTIGATION, ABNORMALITIES IN THE FORE & AFT SERVO ACTUATOR WERE NOTED. THE SERVO ACTUATOR WAS SENT TO THE NTSB LAB FOR EXAMINATION IN WHICH THERE IS A STRONG POSSIBILITY THAT THE UPPER ROD END ON THE FORE & AFT SERVO WAS A PROBLEM. THE
- [SDR 2011F00023](https://openairdocs.org/sdr/2011F00023.md): Fire Detector · false indication · Jan 31, 2011 · N614CL · Aerosp AS355F2 · Fire Detection
  > WHILE FLYING TO DESTINATION, THE LT ENGINE FIRE LIGHT ILLUMINATED. 1 PASSENGER WAS ABOARD. PILOTS MADE A PRECAUTIONARY DIVERSION TO OTHER AIRPORT WHICH WAS THE CLOSEST AIRPORT. UPON LANDING, UNLOADED THE PASSENGER AND CALLED OUR MX DEPARTMENT AND OPS DEPART
- [SDR E30A20090704001](https://openairdocs.org/sdr/E30A20090704001.md): Engine · making metal · Jul 4, 2009 · N912KY · Aerosp AS355F2 · Engine (Turbine/Turboprop)
  > NR 1 ENGINE CHIP LIGHT ILLUMINATED ON MASTER WARNING PANEL. CHIPS FOUND ON DETECTORS, ENGINE REMOVED FOR REPAIR.
- [SDR CA070912008](https://openairdocs.org/sdr/CA070912008.md): Pump · defective · Sep 10, 2007 · Aerosp AS355F2 · Engine Fuel Pump
  > (CAN) ENGINE AUTO-REIGNITION ACTIVATED IN FLIGHT. REPORTS OF SOFT (BANG) PRECEEDING DECEL. INVESTIGATION REVEALED AIR IN FUEL SYSTEM, SUBSEQUENT TROUBLESHOOTING FOUND ENGINE DRIVEN FUEL PUMP DEFECTIVE. (TC NR 20070912008)
- [SDR BAQA20070011](https://openairdocs.org/sdr/BAQA20070011.md): Wire Harness · fatigued · Apr 15, 2007 · N912KY · Aerosp AS355F2 · Fire Protection System Wiring
  > DURING CRUISE FLIGHT THE RT (NR 2) ENGINE FIRE WARNING LIGHT ILLUMINATED WITH NO SECONDARY INDICATION OBSERVED. AIRCRAFT LANDED SAFELY AT A NEARBY EMS HELIPAD WHERE TECH FOUND A BROKEN WIRE AT ONE OF THE ENGINE DETECTORS. WIRING REPAIRED IAW MFG STANDARD PRA
- [SDR BAQA200700005](https://openairdocs.org/sdr/BAQA200700005.md): Compressor · seized · Mar 1, 2007 · N942MS · Aerosp AS355F2 · Engine (Turbine/Turboprop)
  > PILOT WENT TO START NR 1 ENGINE. ENGINE WOULD NOT TURN. FOUND ENGINE SEIZED. REMOVED AND REPLACED ENGINE ASSEMBLY. BROUGHT ENGINE TO ARC, DISASSEMBLED ENGINE AND FOUND 2 (6TH STAGE) COMPRESSOR BLADES BROKEN AND SEIZED THE COMPRESSOR, ALSO REMOVED THE TURBINE
- [SDR MHI2005F00000](https://openairdocs.org/sdr/MHI2005F00000.md): Skin · cracked · Jul 21, 2005 · N406LH · Aerosp AS355F1 · Vertical Stabilizer, Plate/Skin
  > (REF NR: 104942) DURING INSPECTION, FOUND THE UPPER STABILIZER FIN, RT LWR DOUBLER AND NOSE SKIN CRACKED FROM THE 2ND FORWARD RIVET OF THE DOUBLER ACCROSS THE NOSE SKIN. REPLACED STABILIZER WITH SERVICEABLE STABILIZER. (K)
- [SDR HE89099847](https://openairdocs.org/sdr/HE89099847.md): Starter Gen · unserviceable · Mar 17, 2005 · Aerosp AS355F1 · Starter-Generator
  > STARTER WOULDN'T START ENGINE
- [SDR CA040909005](https://openairdocs.org/sdr/CA040909005.md): Pitch Link · broken · Sep 5, 2004 · Aerosp AS355F1 · Main Rotor Head
  > (CAN) DURING CRUISE FLIGHT PILOT FELT SUDDEN VIBRATION IN THE M/R FLIGHT CONTROLS SYSTEM. A/C LANDED AT FIRST SUITABLE SITE. UPON INSPECTION, AME DISCOVERED THAT THE 'SCREW IN' RETAINING CUPS ON ONE OF THE M/R PITCH LINKS LOWER ROD ENDS DISINTEGRATED THUS AL
- [SDR CA040811008](https://openairdocs.org/sdr/CA040811008.md): Blower · damaged · Aug 5, 2004 · Aerosp AS355F1 · Rotorcraft Cooling Fan System
  > (CAN) DURING OPERATION A NOISE WAS HEARD FROM THE BACK OF THE AIRCRAFT, AIRCRAFT WAS LANDED AND DURING INSPECTION TO DETERMINE THE ORIGIN OF THE SOUND IT WAS NOTED THAT THE OIL COOLER BLOWER ASSY WAS DAMAGED AND HAD SEVERAL PIECES MISSING. THE AIRCRAFT WAS RET
- [SDR CA040324003](https://openairdocs.org/sdr/CA040324003.md): Bellcrank · damaged · Mar 7, 2004 · Aerosp AS355F1 · Tail Rotor Control System
  > (CAN) TAIL ROTOR BELLCRANK FOUND WITH WEAR DAMAGE ON INSIDE YOKE AREA AT THE ATTACHMENT BOLT WITH THE TAIL ROTOR PITCH CHANGE SPIDER. THE WEAR CORRESPONDS TO THE BEARING SURFACE OF BALL END P/N 350A33-2150-01. IT IS SUSPECTED THAT THE ATTACHMENT BOLT WAS NOT T
- [SDR CA040324004](https://openairdocs.org/sdr/CA040324004.md): Ring · worn · Mar 7, 2004 · Aerosp AS355F1 · Main Rotor Head
  > (CAN) ALL 3 DROOP RING YOKES WERE FOUND WITH WEAR DAMAGE ON OUTSIDE DIAMETER. THIS WEAR CORRESPONDS WITH WEAR FOUND ON THE DROOP RING CONTACT FITTINGS P/N 350A31-1852- 20 ON EACH STAR ARM. SUSPECT THAT THE YOKES WERE AT ONE TIME INSTALLED UNDER EACH STAR ARM
- [SDR BAQA089603](https://openairdocs.org/sdr/BAQA089603.md): Fuel Control · malfunctioned · Nov 5, 2003 · N912KY · Aerosp AS355F2 · Fuel Controlling System
  > FUEL CONTROL PRODUCING HUNG STARTS, OCCURING BETWEEN 50 PERCENT AND 60 PERCENT. REPLACED WITH SERVICEABLE UNIT. 11/10/03
- [SDR CA031114007](https://openairdocs.org/sdr/CA031114007.md): Connector · burned · Oct 16, 2003 · Aerosp AS355F1 · Fuel System Wiring
  > (CAN) WHILE THE AIRCRAFT WAS IN CRUISE FLIGHT, A BURNING ODOR WAS NOTICED IN THE CABIN. THE PILOT LANDED THE AIRCRAFT UNEVENTFULLY. THE BURNING ODOR WAS TRACED TO THE OVERHEAD LT FUEL PUMP SWITCH. WHEN THE OVERHEAD PANELS WERE REMOVED A BURNED PUMP SWITCH CON
- [SDR BAQA089111](https://openairdocs.org/sdr/BAQA089111.md): Pump · leaking · Sep 12, 2003 · N109DU · Agusta A109E · Engine Fuel Pump
  > LEAKING FUEL FROM DRIVESHAFT. REPLACED WITH SERVICEABLE UNIT.
- [SDR AUS20030944](https://openairdocs.org/sdr/AUS20030944.md): Skin · cracked · Sep 11, 2003 · Aerosp AS355F1 · Rotorcraft Tail Boom
  > (AUS) TAILBOOM SKIN CRACKED IN AREA LOCATED AFT OF THE TAIL ROTOR GEARBOX. CRACK ORIGINATED FROM RIVET HOLE IN TAIL ROTOR GEARBOX COWL BRACKET. CRACKED HAD EXTENDED AFT FOR APPROX 50.8MM TO 76. 2MM (2IN TO 3IN) IN AN AREA NOT NORMALLY VISIBLE WITH VERTICAL STA
- [SDR CA040806008](https://openairdocs.org/sdr/CA040806008.md): Planetary Gear · spalled · Aug 30, 2003 · Aerosp AS355F1 · Main Rotor Gearbox
  > (CAN) EPI CYCLIC WAS MAKING METAL. SOURCE WAS THE PLANET GEAR INNER RACE WAS SPALLING AND MAKING METAL.
- [SDR BAQA088838](https://openairdocs.org/sdr/BAQA088838.md): Transmitter · inoperative · Aug 25, 2003 · N9UC · Aerosp AS355F2 · Engine BMEP/Torque Indicating
  > TORQUE TRANSMITTER IS INOPERATIVE. REPLACED WITH SERVICEABLE UNIT.
- [SDR CA030617002](https://openairdocs.org/sdr/CA030617002.md): Rib · cracked · May 20, 2003 · Aerosp AS355F1 · Vertical Stabilizer, Spar/Rib
  > (CAN) DURING ROUTINE INSPECTION OF THE UPPER VERTICAL FIN ATTACHMENT FRAME, AME DISCOVERED RIB TO BE CRACKED. RIB REPLACED AS PER REPAIR MANUAL AND A/C RETURNED TO SERVICE.
- [SDR BAQA086321](https://openairdocs.org/sdr/BAQA086321.md): Adjuster · loose · May 2, 2003 · N911TM · Aerosp AS355F1 · Fuel Controlling System
  > ENGINE N1 IDLE ADJUSTMENT SCREW HAS FREE MOVEMENT EITHER RIGHT HAND OR LEFT HAND. REPLACED WITH SERVICEABLE UNIT.
- [SDR CA030305003](https://openairdocs.org/sdr/CA030305003.md): Nut · loose · Feb 28, 2003 · Aerosp AS355F1 · Main Rotor Brake
  > (CAN) FLT CREW REPORTED THAT THE ROTOR BRAKE HAD NO EFFECT WHEN APPLIED. THE ROTOR BRAKE PACK WAS BEING INSPECTED AND TO HAVE SHIMS ADJUSTED WHEN THE OUT PUT FLANGE LOCK NUT WAS FOUND ON THE DECK BELOW THE FLANGE. THE OUTPUT FLANGE WAS REMOVED AND INSPECTED WI
- [SDR BAQA082689](https://openairdocs.org/sdr/BAQA082689.md): Governor · malfunctioned · Dec 27, 2002 · N5797X · Aerosp AS355F1 · Turbine Governor
  > NR 2 ENGINE SN 841010 WOULD NOT TRIM. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA081639](https://openairdocs.org/sdr/BAQA081639.md): Engine · malfunctioned · Dec 12, 2002 · N941MS · Aerosp AS355F2 · Engine (Turbine/Turboprop)
  > ENGINE FAILING POWER CHECK. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA081640](https://openairdocs.org/sdr/BAQA081640.md): Engine · malfunctioned · Dec 12, 2002 · N941MS · Aerosp AS355F2 · Engine (Turbine/Turboprop)
  > ENGINE FAILING POWER CHECK. REPLACED WITH SERVICEABLE UNIT.
- [SDR CA021119003](https://openairdocs.org/sdr/CA021119003.md): Hub · cracked · Oct 8, 2002 · Aerosp AS355F1 · Tail Rotor Blades
  > (CAN) IT WAS NOTED THAT ON THE LAST SHUTDOWN A NOISE WAS BEING GENERATED FROM THE T/R BLADE ASSY REGION. IT WAS MENTIONED TO AN ENGINEER AND THEY CARRIED OUT A EQUIVALENT TO A 30 HOUR INSPECTION AS PER AD 84-064-037(B)R3. (NO DISASSEMBLY) A VERY SLIGHT NOISE
- [SDR CA021031003](https://openairdocs.org/sdr/CA021031003.md): Bearing · worn · Sep 24, 2002 · Aerosp AS355F1 · Turbine Engine Compressor Section
  > (CAN) AIRCRAFT IN CRUISE FLIGHT. PILOT NOTICED NG FLUCTUATION BETWEEN ENGINES, FOLLOWED BY ENGINE AT NR 2 CHIP LIGHT AND AN UNUSUAL NOISE & HOWL. PILOT SHUTDOWN NR 2 ENGINE AND MADE UNSCHEDULED LANDING AT NEARBY AIRPORT. NR 2 ENGINE COMPRESSOR SAGS FOUND WORN
- [SDR CA020911002](https://openairdocs.org/sdr/CA020911002.md): Bushing · debonded · Sep 3, 2002 · Aerosp AS355F1 · Main Rotor Head
  > (CAN) ON A DAILY INSPECTION ONE BUSHING WAS FOUND TO BE DEBONDED. THE RETAINING BOLT WAS COMPLETELY PULED OUT OF THE STARFLEX. PILOT REPORTED NO ABNORMAL VIBRATION. STARFLEX ASSEMBLY REPLACED BEFORE NEXT FLIGHT.
- [SDR CA020828005](https://openairdocs.org/sdr/CA020828005.md): Bearing · elongated · Aug 9, 2002 · Aerosp AS355F1 · Tail Rotor Drive Shaft
  > (CAN) NOISE WAS HEARD FROM OIL COOLER FAN AREA ON SHUTDOWN. INSPECTION REVEALED NR 6 T/R DRIVESHAFT SUPPORT BEARING BOLT HOLES HAD ELONGATED AND ALLOWED THE T/R DRIVESHAFT AND FAN SHAFT TO MOVE OUT OF ALIGNMENT. NR 6 BEARING SUPPORT, BEARING AND BEARING TRAN
- [SDR 2002FA0000809](https://openairdocs.org/sdr/2002FA0000809.md): Spline Adapter · fretted · Jul 2, 2002 · Aerosp AS355* · Turbine Engine Compressor Section
  > NEW COMPRESSOR SPLINE ADAPTER WAS PURCHASED FROM MANUFACTURER. SERVICE BULLETIN T-069 WAS PACKAGED WITH THE SPLINE ADAPTER, PROVIDING INSTRUCTIONS TO MODIFY THE IMPELLER THAT THE ADAPTER WAS GOING TO BE INSTALLED IN. BULLETIN WAS LATER RECALLED BY MANUFACTURE
- [SDR CA020521008](https://openairdocs.org/sdr/CA020521008.md): Ball Joint · worn · May 14, 2002 · Aerosp AS355F1 · Rotorcraft Flight Control
  > (CAN) AFTER LAST FLIGHT INSPECTION THE LOWER ROD END WAS FOUND TO BE LOOSE. THE STAKED AREA AROUND THE BALL WAS WORN ENOUGH TO ALLOW IT TO COME OUT OF THE ROD END. NEW ROD END INSTALLED.
- [SDR 2002FA0000789](https://openairdocs.org/sdr/2002FA0000789.md): Seal · leaking · Apr 5, 2002 · N941MS · Aerosp AS355F2 · Engine Fuel Pump
  > MECHANIC NOTICED DRIPPING OF FLUID WHILE AIRCRAFT TOOK OFF, RADIOED PILOT AND REQUESTED AIRCRAFT TO RETURN TO BASE. INSPECTION FOUND FUEL COMING FROM (SEAL DRAIN). REMOVAL OF PUMP, INSPECTION FOUND SHAFT SEAL DETERIORATED.
- [SDR AUS20020106](https://openairdocs.org/sdr/AUS20020106.md): Hook · faulty · Feb 14, 2002 · Aerosp AS355F1 · Passenger Compartment Equipment
  > (AUS) SAFETY HARNESS USED BY CAMERAMAN FAULTY. SNAP HOOK ON HARNESS MAY UNDER SOME CIRCUMSTANCES HAVE THE SPRING LOADED SAFETY CATCH FORCED OPEN ALLOWING THE SNAP HOOK TO SEPARATE FROM THE AIRCRAFT ATTACHMENT POINT.
- [SDR CA020213008](https://openairdocs.org/sdr/CA020213008.md): Pump · making metal · Feb 8, 2002 · Aerosp AS355F1 · Engine Fuel Pump
  > (CAN) NR 1 ENGINE FUEL BOOST PUMP WAS MAKING TOO MUCH NOISE AND VIBRATING AS COMPARED TO NR 2 FUEL BOOST PUMP. INSPECTED THE NR 1 ENGINE DRIVEN FUEL PUMP FILTER AND FOUND NON-FERROUS METAL IN THE FILTER. INSPECTED THE FUEL CONTROL FILTER FOR CONTAMINATION AN
- [SDR AUS20020060](https://openairdocs.org/sdr/AUS20020060.md): Gasket · faulty · Jan 25, 2002 · Aerosp AS355F1 · Main Rotor Gearbox
  > (AUS) MAIN ROTOR TRANSMISSION EPICYCLIC RING GEAR GASKET FAULTY. GASKET WAS EXTRUDING FROM BETWEEN THE UPPER AND LOWER CASES AND BREAKING INTO PIECES AND CAUSING AN OIL LEAK WHICH WAS PROGRESSIVELY WORSENING. ON DISASSEMBLY THE MATING CASE FLANGES SHOWEDSIGNS
- [SDR CA020128002](https://openairdocs.org/sdr/CA020128002.md): Door · separated · Jan 18, 2002 · Aerosp AS355F1 · Cargo/Baggage Doors
  > (CAN) IN CRUISE FLIGHT LT BAGGAGE DOOR DEPARTED THE AIRCRAFT, HITTING THE LT ENGINE COWL. THE AIRCRAFT WAS INSPECTED BY A QUALIFIED AME, BAGGAGE DOOR REPLACED, ENGINE COWL REPAIRED AND THE AIRCRAFT WAS RETURNED TO SERVICE.
- [SDR 2001FA0000384](https://openairdocs.org/sdr/2001FA0000384.md): Adapter · corroded · Oct 5, 2001 · Aerosp AS355F1 · Turbine Engine Compressor Section
  > COUPLING HAS EXCESSIVE FRETTING WEAR ON OD SURFACE. CONTINUED OPERATION MAY HAVE CAUSED FAILURE. SAME CONDITION NOTED ON OTHER COUPLINGS OF THE SAME PART NUMBER. THIS PART NUMBER IS CURRENTLY UNDER INVESTIGATION BY ROLLS-ROYCE (ALLISON ENGINE COMPANY)DUE TO
- [SDR AUS20010846](https://openairdocs.org/sdr/AUS20010846.md): Bearing · damaged · Jul 28, 2001 · Aerosp AS355F1 · Turbine Engine Compressor Section
  > (AUS) NO2 ENGINE NO1 BEARING FAILED.
- [SDR 20010322CW015](https://openairdocs.org/sdr/20010322CW015.md): Spline Adapter · cracked · Feb 16, 2001 · N911NW · Aerosp AS355F1 · Tail Rotor Drive Shaft
  > REMOVED ENGINE ASSEMBLY FOR OIL LEAKS. REMOVED COMPRESSOR AND TURBINE FROM GEAR BOX TO REPLACE SEALS AND ORINGS. INSPECTION OF SPLINE ADAPTOR FOUND CRACK RUNNING APPROX 340 DEGREES AROUND ADAPTOR. TOTAL TIME ON PART IS 555.3 SINCE LAST OVERHAUL AT WHICH TIM
- [SDR 20001220SH008](https://openairdocs.org/sdr/20001220SH008.md): Spring · broken · Dec 1, 2000 · N911NW · Aerosp AS355F1 · Turbine Governor
  > DURING ROUTINE FLIGHT, PILOT EXPERIENCED A RAPID YAW TO THE RIGHT. NR 2 ENGINE, SN CAE-840415, SPOOLED DOWN TO FLIGHT IDLE AS THE RESULT OF THE NR 2 ENGINE GOVERNOR RETENTION SPRING FAILURE. GOVERNOR RETENTIONS SPRING WAS REPLACED. AIRCRAFT RETURNED TO SERI
- [SDR AU001261](https://openairdocs.org/sdr/AU001261.md): Case · cracked · Dec 1, 2000 · Aerosp AS355F1 · Turbine Engine Compressor Section
  > (AUS) NR 2 ENGINE LOWER COMPRESSOR CASE HALF HAD DEBONDING OF THEPLASTIC BAND SECTION BETWEEN NR 3 AND NR 4 STAGES. EXCESSIVE SPOOL RUB EVIDENT ON THE PLASTIC SECTIONS CAUSING EXCESSIVE CRACKING. CIRCUMFERENTIAL CRACKING WAS FOUND ACROSS THE ENTIRE SECTION OF

Next page: https://openairdocs.org/engine/allison-250-c20f/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 = '250C20F'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/allison-250-c20f/reports

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