# Allison 250-C20J

- Type: Engine model (FAA registry)
- Registry code: 03088
- Manufacturer (registry): ALLISON
- Model: 250-C20J
- Engine type: Turbo-shaft
- Power: 420 hp
- Data sheet: [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs)
- Holder: Rolls-Royce Corporation
- Installed in: 16 registered aircraft
- Page: https://openairdocs.org/engine/allison-250-c20j

Model codes come from the FAA registry's reference file.

## ADs that may apply (OpenAirDocs)

Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

- [AD 2022-10-06](https://openairdocs.org/ad/2022-10-06): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20C (T63-A-720) and 9 more. Effective Jun 28, 2022
- [AD 2018-13-01](https://openairdocs.org/ad/2018-13-01): Turbine Governor · Rolls-Royce 250-C10 (T63-A-5), 250-C18, 250-C18A and 24 more. Effective Aug 16, 2018
- [AD 2006-16-04](https://openairdocs.org/ad/2006-16-04): Inspection of the fuel nozzle screen · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Sep 7, 2006
- [AD 2006-13-06](https://openairdocs.org/ad/2006-13-06): Gas producer rotor assembly tie bolts · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 16 more. Effective Jul 26, 2006
- [AD 2005-10-13](https://openairdocs.org/ad/2005-10-13): Turbine energy absorbing ring · Rolls-Royce 250-B17B, 250-B17C, 250-B17D and 7 more. Effective Jun 22, 2005
- [AD 2004-26-09](https://openairdocs.org/ad/2004-26-09): Compressor Adaptor Couplings · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 8 more. Effective Feb 8, 2005
- [AD 2001-24-12](https://openairdocs.org/ad/2001-24-12): Helical Torquemeter Gearshaft Assembly · Rolls-Royce 250-B17, 250-B17C, 250-B17D and 13 more. Effective Dec 19, 2001
- [AD 98-24-28](https://openairdocs.org/ad/98-24-28): Main Fuel Control Bellows · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 36 more. Effective Jan 7, 1999
- [AD 96-19-01](https://openairdocs.org/ad/96-19-01): Superior Air Parts Manufacture Approval (PMA) Bearings · Rolls-Royce 250-B15G, 250-B17F, 250-B17F/1 and 17 more. Effective Sep 26, 1996
- [AD 88-17-01](https://openairdocs.org/ad/88-17-01): Fuel Controls · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 26 more. Effective Mar 1, 1989
- [AD 82-24-05](https://openairdocs.org/ad/82-24-05): Control Assembly and Power Turbine Governor Assembly · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Nov 26, 1982
- [AD 77-15-12](https://openairdocs.org/ad/77-15-12): Power Turbine Coupling Nut · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 23 more. Effective Sep 23, 1977

Historical (superseded or no longer in force):

- [AD 2017-18-14](https://openairdocs.org/ad/2017-18-14) (historical): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20F and 8 more. Effective Oct 13, 2017
- [AD 2015-02-22](https://openairdocs.org/ad/2015-02-22) (historical): Repetitive visual inspections · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 15 more. Effective Mar 9, 2015
- [AD 2004-24-09](https://openairdocs.org/ad/2004-24-09) (historical): Fuel nozzle · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 40 more. Effective Jan 5, 2005

## Registered aircraft (16)

- [N100NJ](https://openairdocs.org/aircraft/N100NJ): [Alba Leasing Services LLC](https://openairdocs.org/faa-owner/ALBA%20LEASING%20SERVICES%20LLC), [Scottsdale, AZ](https://openairdocs.org/faa-place/AZ/Scottsdale), built 1987, S/N 3992
- [N104AP](https://openairdocs.org/aircraft/N104AP): [Rock Creek Leasing LLC](https://openairdocs.org/faa-owner/ROCK%20CREEK%20LEASING%20LLC), [Sapulpa, OK](https://openairdocs.org/faa-place/OK/Sapulpa), built 1990, S/N 4149
- [N105AP](https://openairdocs.org/aircraft/N105AP): [Bearing Tree Land Surveying LLC](https://openairdocs.org/faa-owner/BEARING%20TREE%20LAND%20SURVEYING%20LLC), [Oklahoma City, OK](https://openairdocs.org/faa-place/OK/Oklahoma%20City), built 1995, S/N 4381
- [N11CQ](https://openairdocs.org/aircraft/N11CQ): [Scotts Helicopter Service Inc](https://openairdocs.org/faa-owner/SCOTTS%20HELICOPTER%20SERVICE%20INC), [Le Sueur, MN](https://openairdocs.org/faa-place/MN/Le%20Sueur), built 1984, S/N 3778
- [N130PL](https://openairdocs.org/aircraft/N130PL): [State University Of Iowa](https://openairdocs.org/faa-owner/STATE%20UNIVERSITY%20OF%20IOWA), [Iowa City, IA](https://openairdocs.org/faa-place/IA/Iowa%20City), built 1985, S/N 163345
- [N260BH](https://openairdocs.org/aircraft/N260BH): [Powcres LLC](https://openairdocs.org/faa-owner/POWCRES%20LLC), [Pequannock, NJ](https://openairdocs.org/faa-place/NJ/Pequannock), built 1991, S/N 4179
- [N308LC](https://openairdocs.org/aircraft/N308LC): [Leon County Sheriffs Office](https://openairdocs.org/faa-owner/LEON%20COUNTY%20SHERIFFS%20OFFICE), [Tallahassee, FL](https://openairdocs.org/faa-place/FL/Tallahassee), built 1995, S/N 4367
- [N3399](https://openairdocs.org/aircraft/N3399): [Scotts Helicopter Service](https://openairdocs.org/faa-owner/SCOTTS%20HELICOPTER%20SERVICE), [Le Sueur, MN](https://openairdocs.org/faa-place/MN/Le%20Sueur), built 1968, S/N 305
- [N4328](https://openairdocs.org/aircraft/N4328): [Aircraft Guaranty Corp Trustee](https://openairdocs.org/faa-owner/AIRCRAFT%20GUARANTY%20CORP%20TRUSTEE), [Oklahoma City, OK](https://openairdocs.org/faa-place/OK/Oklahoma%20City), built 1994, S/N 4328
- [N449S](https://openairdocs.org/aircraft/N449S): [S & L Farm And Ranch LLC](https://openairdocs.org/faa-owner/S%20%26%20L%20FARM%20AND%20RANCH%20LLC), [Georgetown, TX](https://openairdocs.org/faa-place/TX/Georgetown), built 1998, S/N 4495
- [N452MC](https://openairdocs.org/aircraft/N452MC): [Citrus County Mosquito Control District](https://openairdocs.org/faa-owner/CITRUS%20COUNTY%20MOSQUITO%20CONTROL%20DISTRICT), [Lecanto, FL](https://openairdocs.org/faa-place/FL/Lecanto), built 1995, S/N 4377
- [N64GK](https://openairdocs.org/aircraft/N64GK): [Aerospace Trust Management LLC Trustee](https://openairdocs.org/faa-owner/AEROSPACE%20TRUST%20MANAGEMENT%20LLC%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1995, S/N 4339
- [N67442](https://openairdocs.org/aircraft/N67442): [Anatasia Mosquito Control District](https://openairdocs.org/faa-owner/ANATASIA%20MOSQUITO%20CONTROL%20DISTRICT), [Saint Augustine, FL](https://openairdocs.org/faa-place/FL/Saint%20Augustine), built 1994, S/N 5152
- [N67873](https://openairdocs.org/aircraft/N67873): [Mf Choppers LLC](https://openairdocs.org/faa-owner/MF%20CHOPPERS%20LLC), [Beeville, TX](https://openairdocs.org/faa-place/TX/Beeville), built 1995, S/N 5218
- [N67978](https://openairdocs.org/aircraft/N67978): [Mf Helicopters LLC](https://openairdocs.org/faa-owner/MF%20HELICOPTERS%20LLC), [East Troy, WI](https://openairdocs.org/faa-place/WI/East%20Troy), built 1995, S/N 5237
- [N862M](https://openairdocs.org/aircraft/N862M): [Chorman Spraying LLC](https://openairdocs.org/faa-owner/CHORMAN%20SPRAYING%20LLC), [Milton, DE](https://openairdocs.org/faa-place/DE/Milton), built 1997, S/N 4473

## NTSB investigations (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN19LA309](https://openairdocs.org/ntsb/CEN19LA309), Sep 9, 2019: Bell 206 (N19TV), Walkerton, IN, substantial damage. Probable cause: The partial loss of engine power due to fuel contamination.
- [NTSB ERA10WA394](https://openairdocs.org/ntsb/ERA10WA394), Jul 29, 2010: Bell Helicopter Textron Canada 206B (N527TK), Libertad, Uruguay, substantial damage, 1 fatal

## FAA accident and incident reports (3)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20190909012949A](https://openairdocs.org/incident/20190909012949A), Sep 9, 2019: Bell 206B (N19TV), Walkerton, IN, Destroyed. While spraying a field, the PIC was coming to the end of a pass. As he went to climb to clear a row of pine trees, the rotorcraft engine lost power. The ship…
- [Incident 20020530020519I](https://openairdocs.org/incident/20020530020519I), May 30, 2002: Bell 206B3 (N11CQ), East Gull Lake, MN, Minor damage. (-23) On take off from East Gull Lake, MN. Aircraft contacted two power lines. Aircraft landed in a field sustaining minor damage. Pilot/mechanic inspected…
- [Incident 19930621028489I](https://openairdocs.org/incident/19930621028489I), Jun 21, 1993: Bell 206B3 (N11CQ), Golden Valley, MN, Minor damage. A golf ball penetrated windshield on approach to landing. Landed safely. Golf course is located near helipad.

## Service difficulty reports (58, newest 50)

As reported by operators and repair stations, by the model named in the report.

- [SDR 2025F00130](https://openairdocs.org/sdr/2025F00130), May 19, 2025: DRIVE SHAFT. CRACKED. DURING 12 MONTH INSPECTION FOUND CRACKS RADIATING FROM WHERE THE RIVETS ARE INSTALLED ON EITHER END ON ONE OF THE SEGMENTED RIVETED DRIVE SHAFT ASSEMBLY. THIS W
- [SDR R73A20210315001](https://openairdocs.org/sdr/R73A20210315001), Mar 8, 2021: ENGINE. MAKING METAL. DURING CRUISE FLIGHT THE PILOT OBSERVED THE "ENGINE CHIP" CAUTION LIGHT ILLUMINATED. PIC LANDED SAFELY IN A NEARBY FOOTBALL FIELD. FOUND (1) SMALL METAL SLIVER 
- [SDR CA190726010](https://openairdocs.org/sdr/CA190726010), Jul 22, 2019: INDICATOR. MALFUNCTIONED. (CAN) INDICATOR FOUND TO BE ROTATED IN TAIL ROTOR GEARBOX HOUSING. SIGHT GLASS REMOVED AND INDICATOR FOUND INSTALLED UPSIDE DOWN. UPSIDE DOWN INSTALLATION OCCUR
- [SDR 2017F00027](https://openairdocs.org/sdr/2017F00027), Dec 4, 2016: BLADE. FAILED. DURING CLIMB 850 FEET, LATERAL VIBRATION CAME. LANDING PROCEDURES, AFTER VISUAL INSPECTION MAIN ROTOR BLADE TIP CAME OUT. AFTER DEEP INSPECTION AT HOME BASE, TE
- [SDR NKVR20150817001](https://openairdocs.org/sdr/NKVR20150817001), Sep 8, 2015: SUPPORT. CRACKED. DURING INSPECTION, FOUND RT LG TUNNEL CRACKED, STATION 125, WL 21, RBL 13.5 & LBL 13.5, UPON FURTHER INSPECTION A CRACK IN THE SAME LOCATION WAS FOUND ON THE LT
- [SDR NKVR20150817002](https://openairdocs.org/sdr/NKVR20150817002), Sep 8, 2015: SUPPORT. CRACKED. DURING INSPECTION, RT LG TUNNEL SUPPORT FOUND TO BE CRACKED.
- [SDR NKVR20150908001](https://openairdocs.org/sdr/NKVR20150908001), Sep 8, 2015: STIFFENER. CRACKED. DURING INSPECTION, STIFFENER FOUND TO BE CRACKED NEAR TAIL BOOM ATTACH INSPECTION PANEL.
- [SDR NKVR20150908002](https://openairdocs.org/sdr/NKVR20150908002), Sep 8, 2015: STIFFENER. CRACKED. DURING INSPECTION, STIFFENER NEAR TAIL BOOM ATTACH INSPECTION PANEL FOUND TO BE CRACKED.
- [SDR CA150827011](https://openairdocs.org/sdr/CA150827011), Aug 24, 2015: BEARING. FAILED. (CAN) ACFT WARNING SYSTEM INDICATED METAL CHIP GENERATION INSIDE MAIN TRANSMISSION. TRANSMISSION REMOVED FROM ACFT AND INVESTIGATION FOUND DUPLEX BEARING DETERI
- [SDR CA140826026](https://openairdocs.org/sdr/CA140826026), Aug 11, 2014: RIB. CRACKED. (CAN) WHEN CARRYING OUT A 300 HR INSPECTION ON THE ACFT, A CRACK WAS FOUND ON THE LT STABILIZER ATTACHMENT FITTING OF THE INBD RIB. THERE WERE NO DEFECTS FOUND 
- [SDR 2013FA0000294](https://openairdocs.org/sdr/2013FA0000294), May 15, 2013: ENGINE. MAKING METAL. DURING FLIGHT, PILOT HEARD INCREASING "RUMBLING" NOISE. PILOT LANDED TO THE NEAREST LANDABLE SIDE APPROX 2 MIN AFTER THE NOISE STARTED. RUMBLING DECREASED SIMUL
- [SDR 2013FA0000667](https://openairdocs.org/sdr/2013FA0000667), May 3, 2013: BEARING. FAILED. ENGINE CHIP LIGHT DURNG FLIGHT, PILOT HEARD INCREASING "RUMBLING" NOISE. LANDED TO THE NEAREST LANDABLE SITE, APPROXIMATELY TWO MINUTES AFTER THE NOISE STARTED.
- [SDR 2013FA0000668](https://openairdocs.org/sdr/2013FA0000668), May 3, 2013: BEARING. FAILED. ENGINE CHIP LIGHT, DURING FLIGHT, PILOT HEARD INCREASING "RUMBLING" NOISE. LANDED TO THE NEAREST LANDABLE SITE, APPROX 2 MIN AFTER THE NOISE STARTED. RUMBLING D
- [SDR CA130402001](https://openairdocs.org/sdr/CA130402001), Feb 8, 2013: NUT. CRACKED. (CAN) DURING A 50 HOUR LUBE BEING CARRIED OUT ON THE M/R HUB ASSY, IT WAS NOTICED THAT A MS21042L4, NUT WHICH RETAINS 1 OF THE 2 THROUGH BOLTS, WHICH RETAINS TH
- [SDR CA110615011](https://openairdocs.org/sdr/CA110615011), Jun 14, 2011: BEARING. LOOSE. DRAG PIN BEARING CAME LOOSE IN THE SLEEVE.
- [SDR CA080519001](https://openairdocs.org/sdr/CA080519001), May 15, 2011: DRIVE SHAFT. DAMAGED. (CAN) THE INTERNAL SPRING INSIDE THE DRIVE SHAFT COUPLING GEAR WAS FOUND TO HAVE BEEN DAMAGED DUE TO IMPROPER INSTALLATION DURING LAST CALENDAR INSPECTION. DAMA
- [SDR 2010FA0001212](https://openairdocs.org/sdr/2010FA0001212), Dec 1, 2010: HYDROMECH UNIT. MALFUNCTIONED. LOSS OF HYD POWER AND WITHOUT NR INDICATED.
- [SDR 2010FA0001065](https://openairdocs.org/sdr/2010FA0001065), Jul 27, 2010: COUNTERWEIGHT. LOOSE. ACFT WAS PERFORMING A TRAINING MISSION WHEN THE MID SPAR MAIN ROTOR BLADE WEIGHT CAME LOOSE. THE ACFT PRECAUTIONARY LANDED WITH NO INJURIES. THE MID SPAR BLADE 
- [SDR CA100702008](https://openairdocs.org/sdr/CA100702008), Jun 28, 2010: ACCUMULATOR. CRACKED. PILOT REPORTED M/R DROOPING OFF WHEN POWER IS APPLIED. RECORDS SHOWED GOVERNOR NEAR T/X FOR O/H. SUSPECT GOVERNOR WAS REPLACED, GROUND RUN AND LEAK TESTS WERE P
- [SDR CA090922007](https://openairdocs.org/sdr/CA090922007), Sep 21, 2009: ELT. FAILED. (CAN) E.L.T SWITCHED ON WITH NO REASON AND WOULD NOT RESPOND TO RESET, NOT FROM REMOTE SWITCH AND NOT DIRECTLY FROM E.L.T SWITCH. E.L.T BATTERIES NEEDED TO BE D
- [SDR CA090309002](https://openairdocs.org/sdr/CA090309002), Feb 26, 2009: MOUNT. CORRODED. (CAN) DURING COMPLIANCE OF TB206-89-129 (REMOVAL OF ENGINE MOUNT LEG CLAMSHELL DAMPERS), IT WAS NOTICED AFTER THE REMOVAL OF THE CLAMSHELL DAMPERS AND THEIR PAC
- [SDR ULXR2009022580899](https://openairdocs.org/sdr/ULXR2009022580899), Feb 25, 2009: MODULE. INOPERATIVE. AUTO REIGNITION SYS DID NOT TEST ON PREFLIGHT INSP. REPLACED AUTO REIGNITION MODULE AND CORRECTED PROBLEM. CAUSE OF FAILURE INSIDE BOX IS UNKNOWN.
- [SDR 2008FA0000846](https://openairdocs.org/sdr/2008FA0000846), Nov 24, 2008: GROUND WIRE. MISSING. MFG HAS REMOVED A GROUND WIRE FROM BOTH ELECTRIC BOOST PUMPS. GROUND HAS BEEN ON EARLIER MODELS, REMOVED SINCE SN: 4205 IAW WIRING DIAGRAMS. CAUTION LIGHTS FOR 
- [SDR 2008FA0000609](https://openairdocs.org/sdr/2008FA0000609), Sep 5, 2008: BLADE. FAILED. THIRD STAGE COMPRESSOR BLADE, ONE OF THE BLADES WAS "THROWN" FROM THE PART. NOTE: THIS COMPRESSOR WHEEL IS A ONE-PIECE BLADE DISK. (K)
- [SDR 2008FA0000459](https://openairdocs.org/sdr/2008FA0000459), Jul 1, 2008: METER. MALFUNCTIONED. AC MAINT HOBBS METER FOUND RUNNING SLOW. THIS PROBLEM CAUSES THE ACTUAL TT OF THE AC TO BE INCORRECT. THIS PROBLEM CAUSED THE AC TO OVER RUN INSPECTIONS, AND TI
- [SDR CA071115003](https://openairdocs.org/sdr/CA071115003), Nov 15, 2007: BOLT. CRACKED. (CAN) COMPRESSOR TIEBOLT S/N KU506716 FOUND CRACKED AXIALLY UPON REWORK AT MPI AFTER REMOVAL OF SILVER PLATING ON EXTERIOR OF PART. PART SCRAPPED. CRACK WAS NOT
- [SDR AWTR113954](https://openairdocs.org/sdr/AWTR113954), Feb 2, 2007: MOUNT. CRACKED. FOUND 2.5 IN CRACK FROM LT REAR MOUNT HOLE FWD.
- [SDR HEEA111202](https://openairdocs.org/sdr/HEEA111202), Sep 22, 2006: RELAY. NOISY. NOTED WHINGING NOISE IN RADIO PRIOR TO GENERATOR GOING OFF LINE. CHECKED CIRCUIT BREAKERS AND THEY WERE NOT TRIPPED. RESET GENERATOR, AND LOAD METER SPIKED TO H
- [SDR AU510001926](https://openairdocs.org/sdr/AU510001926), Dec 12, 2005: TRUNNION. CRACKED. (AUS) TAIL ROTOR HUB ASSEMBLY TRUNNION CRACKED ON INNER BEARING RACE. (OTHER CAUSE: MATERIAL ) (CASA NR 510001926)
- [SDR AU510001932](https://openairdocs.org/sdr/AU510001932), Dec 12, 2005: PITCH HORN. DAMAGED. (AUS) MAIN ROTOR HEAD PITCH HORN DAMAGED BEYOND REPAIR. INVESTIGATION FOUND THAT AN INDENTATION IN THE PITCH HORN UPPER SURFACE WAS PREVIOUS DAMAGE THAT HAD BEE
- [SDR CA050719001](https://openairdocs.org/sdr/CA050719001), Jul 15, 2005: GEARBOX. FAILED. THE PILOT OBSERVED LOW/ERRATIC OIL PRESSURE AND TORQUE INDICATIONS AND EXECUTED A PRECAUTIONARY LANDING. A LARGE OIL LEAK WAS FOUND FROM THE EXHAUST STACK (GEAR
- [SDR CA050503004](https://openairdocs.org/sdr/CA050503004), Apr 23, 2005: BEARING. SPALLED. (CAN) ENGINE CHIP DETECTOR WARNING IN FLIGHT. 2ND WARNING LIGHT IN 6 HOURS. FINE FERROUS METAL ON PLUG. SMALL BRASS PARTICLES IN OIL FILTER. TROUBLE SHOOTING IN
- [SDR 2004FA0000849](https://openairdocs.org/sdr/2004FA0000849), Oct 18, 2004: TURBINE WHEEL. FAILED. DURING GROUND RUN, AFTER SCHEDULED TURBINE REPLACEMENT, LEAK CHECKS HAD BEEN COMPLETED AT IDLE POWER. WHILE ADDING POWER, AT ABOUT 85 PERCENT N2 THE NR 3 TURBIN
- [SDR 2004FA0000850](https://openairdocs.org/sdr/2004FA0000850), Oct 18, 2004: TURBINE WHEEL. FAILED. DURING GROUND RUN, AFTER SCHEDULED TURBINE REPLACEMENT, LEAK CHECKS HAD BEEN COMPLETED AT IDLE POWER. WHILE ADDING POWER, AT ABOUT 85 PERCENT N2 THE NR3 TURBINE
- [SDR QR92004F00000](https://openairdocs.org/sdr/QR92004F00000), Jul 6, 2004: ADAPTER. SHEARED. ENGINE REMOVED FROM SERVICE FOR ENGINE CHIP LIGHT ILLUMINATION, FOLLOWED BY ENGINE FAILURE DURING PINNACLE LANDING. TEAR DOWN ANALYSIS REVEALED COUPLING ADAPTER
- [SDR ULX2004F00018](https://openairdocs.org/sdr/ULX2004F00018), Mar 1, 2004: FLYWEIGHT. MALFUNCTIONED. N2 RPM UNSTABLE. WILL NOT HOLD N2 RPM STABILIZED. PROBABLE CAUSE: FLYWHEEL WEIGHT MALFUNCTION.
- [SDR 2003FA0001038](https://openairdocs.org/sdr/2003FA0001038), Sep 16, 2003: BEARING. MALFUNCTIONED. WHILE IN FLIGHT PILOT EXPERIENCED ENGINE HIGH SIDE GOVERNOR FAILURE. THE PILOT WAS UNABLE TO CONTROL RISING ENGINE SPEED WITH THE THROTTLE. RPM ROSE TO 115 PERC
- [SDR HEEA087236](https://openairdocs.org/sdr/HEEA087236), Jun 10, 2003: PUMP. MALFUNCTIONED. INTERMITTENT HANG STARTS ON FIRST START OF DAY. REPAIRED.
- [SDR CA020322009](https://openairdocs.org/sdr/CA020322009), Mar 19, 2002: VENT LINE. OBSTRUCTED. (CAN) DURING SCHEDULED 100 HOUR ANNUAL & 12 MONTH INSPECTION. PROCEEDED TO CHECK OP OF LOW FUEL WARNING SYS. REMOVED FUEL LINE GOING TO AIRFRAME FUEL FILTER AND
- [SDR HEEA076800](https://openairdocs.org/sdr/HEEA076800), Oct 16, 2001: COUPLING. CORRODED. N1 COUPLING HAS EXCESSIVE RUST CAUSING PITTING.
- [SDR CA010809016](https://openairdocs.org/sdr/CA010809016), Jul 22, 2001: CASE. DAMAGED. (CAN) ON WINDUP FROM GROUND IDLE TO FLIGHT IDLE, THE PILOT HEARD A POPPING NOISE AND A STEADY SOUND OF RUSHING AIR. THE TURBINE OUTLET TEMPERATURE (TOT) HAD CLI
- [SDR CA991229066](https://openairdocs.org/sdr/CA991229066), Dec 17, 1999: BUSHING. CRACKED. (CAN) DURING 100 HOUR INSPECTION, RT ENGINE MOUNT WAS FOUND LOOSE. UPON DISASSEMBLY, THE BUSHING WAS FOUND TO BE SEPARATED (RUBBER BONDS WERE SEPARATED). BUSHIN
- [SDR CA991028071](https://openairdocs.org/sdr/CA991028071), Oct 12, 1999: EXHAUST STACK. CRACKED. (CAN) CRACK WAS FOUND IN THE AREA OF THE EXHAUST STACK RETAINING CLAMP.
- [SDR CA990927093](https://openairdocs.org/sdr/CA990927093), Sep 11, 1999: SKIN. CRACKED. (CAN) 2.5 INCH LONGITUDINAL CRACK FOUND ON LEFT SIDE OF TAILBOOM APPROXIMATELY 3 INCHES BELOW THE MOST REARWARD T/R DRIVESHAFT BEARING HANGAR (BS 146 APPROX). T
- [SDR 99ZZZX2239](https://openairdocs.org/sdr/99ZZZX2239), May 12, 1999: EXCITER. FAILED. EXCITER FAILED. REMOVED AND REPLACED.
- [SDR CA990513007](https://openairdocs.org/sdr/CA990513007), Apr 30, 1999: ARMATURE. MISOVERHAULED. (CAN) FOLLOWING OVERHAUL, IT WAS FOUND THAT THE STARTER/GENERATOR CONTAINED NUMEROUS PARTS THAT ARE NOT APPROVED.
- [SDR 98ZZZX4738](https://openairdocs.org/sdr/98ZZZX4738), Dec 5, 1998: VALVE. FAILED. VALVE DOES NOT CLOSE COMPLETELY. REMOVED AND REPLACED.
- [SDR AU981541](https://openairdocs.org/sdr/AU981541), Nov 15, 1998: NOZZLE. CARBONED. (AUS) NR 6 AND NR 7 BEARING OIL PRESSURE NOZZLE EXTENSIVELY CARBONED UP BETWEEN THE NOZZLE AND THE SCAVENGE OIL STRUT IN THE POWER TURBINE SUPPORT. OIL PRESSURE
- [SDR CA980629001](https://openairdocs.org/sdr/CA980629001), Jun 11, 1998: FCU. FAILED. (CAN) DURING START SEQUENCE, THE TEMPERATURE EXCEEDED LIMITS OF 944 CELSIUS. HOT START INSPECTION CARRIED OUT, NO PROBLEMS. SUBMITTER STATED FCU FOUND TO BE CAU
- [SDR HEEA0014592](https://openairdocs.org/sdr/HEEA0014592), Jun 4, 1998: ACTUATOR. MALFUNCTIONED. ACTUATOR STICKS ON HIGH SIDE.

All 58: https://openairdocs.org/engine/allison-250-c20j/reports.md

## STCs that may be installed (OpenAirDocs) (6)

Approved for this engine model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has.

- [STC SE5511NM](https://openairdocs.org/stc/SE5511NM): Installation of compressor discharge pressue (PC) valve. Bell Helicopter Textron Inc
- [STC SE00014EN](https://openairdocs.org/stc/SE00014EN): Installation of the Pratt & Whitney Engine Services, Inc. CrossCheck Engine Monitor Kit P/N HUMS-K-071-1, Rev. A on the specified PT6A engine models and kit P/N HUMS-K-071-2 on the specified A250 engine models. Pratt & Whitney Engine Services Inc
- [STC SE00027EN](https://openairdocs.org/stc/SE00027EN): Installation of Pratt & Whitney Engine Services Inc. Intellistart plus electronic control unit (ECU), P/N DPU-K-010 on the specified 250 engine models. Pratt & Whitney Engine Services Inc
- [STC SE492GL](https://openairdocs.org/stc/SE492GL): Incorporation of a fuel flow transducer. Shadin Avionics
- [STC ST00037AT](https://openairdocs.org/stc/ST00037AT): Unison igniter plugs, P/N 9044400-1. Unison Industries
- [STC SQ00338AT](https://openairdocs.org/stc/SQ00338AT): Unison igniter leads, P/N9048222-101, 102, 103, 104, 105, 106. Unison Industries

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