# Allison 250-C20R/2 - Type: Engine model (FAA registry) - Registry code: 03092 - Manufacturer (registry): ALLISON - Model: 250-C20R/2 - Engine type: Turbo-shaft - Power: 450 hp - Data sheet: [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs) - Holder: Rolls-Royce Corporation - Installed in: 8 registered aircraft - Page: https://openairdocs.org/engine/allison-250-c20r-2 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 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 Effective Sep 23, 1977 Historical (superseded or no longer in force): - [AD 2017-18-14](https://openairdocs.org/ad/2017-18-14) (historical): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20F and 8 more.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 2012-14-06](https://openairdocs.org/ad/2012-14-06) (historical): Released turbine blades and shrouds · Rolls-Royce 250-C20, 250-C20B and 250-C20R/2. Effective Aug 14, 2012 - [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 - [AD 2001-20-51](https://openairdocs.org/ad/2001-20-51) (historical): Helical Torquemeter Gearshaft Assembly · 250-B17, 250-B17C, 250-B17D and 12 more ## Registered aircraft (8) - [N12EW](https://openairdocs.org/aircraft/N12EW): [Jetcopters LLC](https://openairdocs.org/faa-owner/JETCOPTERS%20LLC), [Lewes, DE](https://openairdocs.org/faa-place/DE/Lewes), built 1977, S/N 45126 - [N311VT](https://openairdocs.org/aircraft/N311VT): [Geco Inc](https://openairdocs.org/faa-owner/GECO%20INC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1987, S/N 0229E - [N369FC](https://openairdocs.org/aircraft/N369FC): [Ferguson And Sons Construction LLC](https://openairdocs.org/faa-owner/FERGUSON%20AND%20SONS%20CONSTRUCTION%20LLC), [Emmett, ID](https://openairdocs.org/faa-place/ID/Emmett), built 1981, S/N 610983D - [N500BH](https://openairdocs.org/aircraft/N500BH): [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 1998, S/N 0537E - [N510PJ](https://openairdocs.org/aircraft/N510PJ): [Mid Pacific Aero Services LLC](https://openairdocs.org/faa-owner/MID%20PACIFIC%20AERO%20SERVICES%20LLC), [Honolulu, HI](https://openairdocs.org/faa-place/HI/Honolulu), built 1993, S/N LN054 - [N520MG](https://openairdocs.org/aircraft/N520MG): [Hagedorn Aviation](https://openairdocs.org/faa-owner/HAGEDORN%20AVIATION), [Columbus, OH](https://openairdocs.org/faa-place/OH/Columbus), built 1992, S/N LN004 - [N915LY](https://openairdocs.org/aircraft/N915LY): [Lyons Aircraft Leasing LLC](https://openairdocs.org/faa-owner/LYONS%20AIRCRAFT%20LEASING%20LLC), [Hillsboro, OR](https://openairdocs.org/faa-place/OR/Hillsboro), built 1989, S/N 0350E - [N926DD](https://openairdocs.org/aircraft/N926DD): [Turbine Flying Penguins LLC](https://openairdocs.org/faa-owner/TURBINE%20FLYING%20PENGUINS%20LLC), [Gardnerville, NV](https://openairdocs.org/faa-place/NV/Gardnerville), built 1991, S/N 0426E ## 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 WPR17LA005](https://openairdocs.org/ntsb/WPR17LA005), Oct 4, 2016: Mcdonnell Douglas Helicopter 369E (N311VT), Waimea, HI, substantial damage. Probable cause: Impact of the lift cable after it exited the helicopter during liftoff with the main rotor (MR) blades, which resulted in the separation of an MR blade tip and the vertical vibration of the… - [NTSB CEN11LA339](https://openairdocs.org/ntsb/CEN11LA339), May 16, 2011: MD Helicopter 369E (N4278T), Victoria, TX, substantial damage. Probable cause: The pilot’s failure to ensure that the governor limit switch was properly set, which resulted in reduced engine power. ## 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. - [Incident 20180624008539I](https://openairdocs.org/incident/20180624008539I), Jun 24, 2018: Bell 206L (N12EW), Andrews, SC, Minor damage. While flying approximately 20 feet above the black river, struck power lines crossing the river. - [Accident 20161004017849A](https://openairdocs.org/incident/20161004017849A), Oct 4, 2016: Mcdonnell Douglas Helicopter 369E (N311VT), Waimea, HI, Substantial damage. Manuiwa airways, inc., dba volcano helicopters was conducting flight operations under 14 CFR part 135 for the kohala watershed partnership, N311VT had just… - [Accident 20110516013289A](https://openairdocs.org/incident/20110516013289A), May 16, 2011: Md Helicopters Inc 369E (N4278T), Victoria, TX, Substantial damage. Aircraft departed Victoria, Texas (kvct). Pilot reported to tower he had lost partial power and was down in a field with no injuries. Total flight time… ## Service difficulty reports (66, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR 2019FA0000124](https://openairdocs.org/sdr/2019FA0000124), Apr 13, 2019: CONTROL CABLE. BINDING. A/C EXPERIENCED STUCK RIGHT PEDAL IN FLIGHT RESULTING IN EMERGENCY LANDING. UPON INSPECTION OF ANTI-TORQUE SYSTEM, FOUND FORWARD AND AFT THRUSTER CONTROL CABLE - [SDR CA160107008](https://openairdocs.org/sdr/CA160107008), Jan 4, 2016: TURBINE. FAILED. (CAN) THE TURBINE HAD A CATASTROPHIC FAILURE. - [SDR CA141017005](https://openairdocs.org/sdr/CA141017005), Oct 8, 2014: CARTRIDGE. LEAKING. (CAN) BOOST PUMP FUEL CARTRIDGE LEAKING FUEL AND REQUIRES O/H, REPLACED WITH TSO 0.0. - [SDR CA141016002](https://openairdocs.org/sdr/CA141016002), Oct 7, 2014: BLADE. DEBONDED. (CAN) TAIL ROTOR BLADES, L/E STRIPS FOUND DEBONDED AT BLADE TIPS. EDGE OF L/E STRIP SEPARATED FROM AIRFOIL. BOTH BLADES REMOVED FROM SERVICE AND REPLACED BY NEW - [SDR ZD4R20130530610](https://openairdocs.org/sdr/ZD4R20130530610), May 8, 2013: RETAINING RING. DISLODGED. A CHIP LIGHT ILLUMINATED, CLEANED CHIP PLUGS AND RETURNED ENGINE BACK TO SERVICE. APPROX 11 HOURS LATER, CHIP LIGHT ILLUMINATED AND METAL WAS MORE SIGNIFICANT T - [SDR CA121019012](https://openairdocs.org/sdr/CA121019012), Oct 17, 2012: TURBINE. SEIZED. (CAN) WHILE DECENDING FOR AN APPROACH INTO CAMP, AT APPROXIMATELY 200 FEET AGL, PILOT HEARD A LOUD BANG FOLLOWED BY A YAW, AND A LOSS OF ENGINE POWER. PILOT ENT - [SDR 2012FA0000117](https://openairdocs.org/sdr/2012FA0000117), Dec 27, 2011: TORQUE TUBE. MISMANUFACTURED. DURING A 600 HR A/F INSPECTION, NOTICED 8 RIVETS SHOWING EVIDENCE OF LOOSENESS. THE AFFECTED RIVETS ARE LOCATED ON THE RT SIDE OF THE TORQUE TUBE AND GO AROUND. - [SDR 2011FA0000385](https://openairdocs.org/sdr/2011FA0000385), Jun 7, 2011: COVER. CRACKED. WITHIN 1 WEEK OF RECEIVING THIS UNIT BACK FROM O/H, IT STARTED SEEPING OIL. THOUGHT IT WAS LEAKING FROM THE SCAV PUMP, REMOVED THE PUMP AND INSTALLED NEW PACKIN - [SDR CA091109007](https://openairdocs.org/sdr/CA091109007), Nov 6, 2009: INDICATOR. MISREPAIRED. (CAN) RECEIVED THIS INDICATOR FROM O/H AND IT WAS FOUND TO BE INDICATING 300 DEGREES CELSIUIS TO HIGH UPON INSTALLATION AND TEST. WE ARE ASSUMING THIS PROBLEM W - [SDR CA090304008](https://openairdocs.org/sdr/CA090304008), Feb 27, 2009: BEARING. DAMAGED. (CAN) RECEIVED MAIN ROTOR HUB FOR REPLACEMENT OF TIME EXPIRED COMPONENTS. WHEN DISASSEMBLED FOUND THAT BOTH OTBD EXCLUDERS IN GRIP ASSEMBLIES WERE NO LONGER RET - [SDR CA081017007](https://openairdocs.org/sdr/CA081017007), Oct 17, 2008: GOVERNOR. MALFUNCTIONED. (CAN) UPON REMOVAL OF THE GOVERNOR IT WAS NOTED THAT THE DRIVE GEAR HAD COME SEPARATED. ALL PARTS WERE FOUND IN THE DRIVE GEAR FOR THE GOVERNOR. THERE WAS DIFFI - [SDR CA080625005](https://openairdocs.org/sdr/CA080625005), Jun 12, 2008: BLADE. DELAMINATED. (CAN) DELAMINATION AT ROOT OF BLADE ON UPPER SURFACE OF THE GIP PLATE FINGER. VISUAL SEPARATION NOTED ON DAILY INSP. - [SDR CA080603005](https://openairdocs.org/sdr/CA080603005), Jun 2, 2008: PUMP. MALFUNCTIONED. (CAN) REINFORCED PAPER WIPERS LEFT IN THE FUEL TANK AFTER WORK CARRIED OUT. DURING A 300 HOUR INSP, THERE WAS SIGNIFICANT FUZZ LIKE DEBRIS FOUND IN THE ENGINE D - [SDR CA080103007](https://openairdocs.org/sdr/CA080103007), Jan 3, 2008: BOLT. BROKEN. (CAN) ON INSPECTION OF THE AIRCRAFT IT WAS NOTED THAT THE (1) OF THE (3) BOLTS WAS BROKEN AND THE OTHERS SHOWED SIGNS OF CORROSION ALL (3) BOLTS WHERE REPLACED - [SDR CA071029004](https://openairdocs.org/sdr/CA071029004), Aug 9, 2007: HOUSING. CRACKED. (CAN) OIL FOUND ON TRANSMISSION DECK AFTER BRIEF DAILY INSPECTION, OIL LEAK FOUND FROM THE BOTTOM OF THE TRANSMISSION. UPON FURTHER INVESTIGATION TRANSMISSION R - [SDR CA070726003](https://openairdocs.org/sdr/CA070726003), Jul 9, 2007: SLEEVE. CRACKED. (CAN) PILOT STARTING A/C, THROTTLE OPENED, NO ENGINE LIGHT OFF OCCURED. OPENED ENGINE COWL TO INVESTIGATE, NOTICED FUEL DRIPPING FROM AROUND START DE-RICHMENT A - [SDR CA070327009](https://openairdocs.org/sdr/CA070327009), Mar 13, 2007: GEARBOX. LEAKING. (CAN) OIL LEAK. SHIPPED TO AUTHORIZED SERVICE CENTER FOR REPAIR AND RE-INSTALLATION. (TC NR 20070327009) - [SDR CA061120001](https://openairdocs.org/sdr/CA061120001), Nov 4, 2006: SWITCH. LEAKING. (CAN) REMOVED LT FUEL FLOW SWITCH DUE TO LEAKING. INSTALLED FUEL FLOW SWITCH PN 205-061-635-005 SN 9607 (TC NR 20061120001). - [SDR CA061117001](https://openairdocs.org/sdr/CA061117001), Nov 3, 2006: TRANSDUCER. READS LOW. (CAN) UNDER READING FUEL PRESSURE. REMOVED AND INSTALLED REPLACEMENT PRESSURE TRANSDUCER PN BSE 206-30G SN2617-1-251 (TC NR 20061117001) - [SDR CA051012007](https://openairdocs.org/sdr/CA051012007), Sep 27, 2005: HINGE. BROKEN. ON APPROACH WITH A SLING LOAD THE BATTERY DOOR OPEN AT A SPEED OF 60 MPH AND THE DOOR HINGE BROKE. THE DOOR STAYED ATTACH TO THE AIRCRAFT BY THE SPRING P/N 206- - [SDR CA050617004](https://openairdocs.org/sdr/CA050617004), May 27, 2005: SEAL. LEAKING. (CAN) REPLACED SEAL DUE TO LEAKING OIL. (FREEWHEEL) - [SDR CA050511004](https://openairdocs.org/sdr/CA050511004), Apr 19, 2005: FAN. DAMAGED. THE COOLING FAN IN THE STARTER GEN DEVELOPED A CRACK IN THE FAN BLADE PART (4 BLADES ARE STAMPED FROM ONE ALUMINUM PIECE, AND SWAGED ON A STEEL HUB) AT THE NOTC - [SDR CA041222006](https://openairdocs.org/sdr/CA041222006), Dec 9, 2004: TURBINE. FAILED. (CAN) CHIP LIGHT AND ENGINE VIBRATION. PRECAUTIONARY LANDING. ON SUBSEQUENT INSPECTION, TURBINE FOUND TO HAVE FAILED. EXHAUST STACKS AND COMBUSTION LINER FOUND - [SDR CA040623009](https://openairdocs.org/sdr/CA040623009), Jun 23, 2004: BLADE. PERFORATED. (CAN) WHILE CARRYING OUT REQUIREMENTS OF AD CF-2004-05(BHTC ASB 206L-04-127 REV A) A PIN HOLE IN THE EPOXY FILLER, APPROXIMATELY .012 IN. DIA, INTRUDING INTERNA - [SDR CA040727008](https://openairdocs.org/sdr/CA040727008), Jun 3, 2004: WASHER. MISSING. (CAN) AFTER FINDING MISSING CARRIAGE ROLLER WASHERS ON ANOTHER LONG RANGER, INSPECTED AND FOUND IT TO BE THE SAME, NO WASHERS. - [SDR CA040603007](https://openairdocs.org/sdr/CA040603007), Jun 2, 2004: TURBINE. LOCKED. (CAN) TURBINE HAD AN N2 LOCK UP. SUSPECT UNKNOWN AT THIS TIME. TURBINE SENT TO OVERHAUL SHOP FOR ASSESSMENT. - [SDR CA040428004](https://openairdocs.org/sdr/CA040428004), Apr 19, 2004: ELT. FAILED. (CAN) UPON ANNUAL RE-INSPECTION FOR RE-CERTIFICATION PURPOSES, AVIOINICS SHOP REPORTED ELT S/N 353494 FAILS TEST PROBABLY DUE TO A BAD CRYSTAL. UPON BEING ADVIS - [SDR CA040806007](https://openairdocs.org/sdr/CA040806007), Apr 17, 2004: FITTING. MISINSTALLED. (CAN) AFTER A VISUAL INSPECTION, ENGINE GB MOUNT FITTING 206-063-110-003 (RT) AND FITTING 206-063-110-001 (BOTTOM) WERE FOUND INTERMIXED. BOTTOM FITTING IS 0.4 - [SDR CA040427014](https://openairdocs.org/sdr/CA040427014), Apr 14, 2004: COUPLING. WORN. (CAN) UPON INSPECTION, SPLINE/COUPLING P/N 9A1424 WAS FOUND WORN. REMOVED OIL PUMP AND TACH GENERATOR AND MATING COUPLING P/N 9A1424 FOR INSPECTION AND REPAIR. - [SDR 2004FA0000269](https://openairdocs.org/sdr/2004FA0000269), Feb 14, 2004: GAUGE. INACCURATE. PILOT REPORTED OPERATIONAL EXCEEDANCE DURING FLIGHT RETURNED AC TO HELIPORT. UPON FURTHER INSPECTION AND EVALUATION IT WAS DETERMINED THAT THE DIAMOND J. TORQUE - [SDR CA031126009](https://openairdocs.org/sdr/CA031126009), Nov 24, 2003: PIN. BROKEN. (CAN) BLADE PIN FOUND TO BE BROKEN WHERE THREAD MEETS THE PIN. - [SDR CA031017004](https://openairdocs.org/sdr/CA031017004), Oct 4, 2003: FUEL CONTROL. FAILED. (CAN) AFTER LANDING, THROTTLE WAS SNAP ROLLED TO IDLE. N2 WAS NR IMMEDIATELY INCREASED TO 105 PERCENT AND STABILIZED. ENGINE WAS SHUT DOWN BY ROLLING THROTTLE T - [SDR CA030903005](https://openairdocs.org/sdr/CA030903005), Aug 18, 2003: BEARING. FAILED. (CAN) AS DESCRIBED ABOVE ROLLER BEARING PN 369D25146 INNER RACE FAILURE. IN THIS CASE THIS FAILURE WAS DETECTED BY THE AIRCRAFTS WARNING SYSTEM. THE AIRCRAFT WA - [SDR CA030612005](https://openairdocs.org/sdr/CA030612005), Jun 12, 2003: CASE. CRACKED. (CAN) ROUTINE INSPECTON AND CHANGING FUEL NOZZLE IT WAS SUSPECTED THAT THERE WAS A CRACK ALONG THE WELD WHERE THE FUEL NOZZLE ADAPTER IS ATTATCHED TO THE END OF - [SDR CA030612006](https://openairdocs.org/sdr/CA030612006), Jun 12, 2003: CASE. CRACKED. (CAN) AFTER INPSECTION WITH THE ENGINE RUNNING A LEAK CHECK WAS CARRIED OUT BY PLACING A HAND IN AREA OF THE FUEL NOZZLE AND AIR WAS FELT. THE ENGINE WAS SHUT D - [SDR CA031031006](https://openairdocs.org/sdr/CA031031006), Jun 12, 2003: GOVERNOR. FAILED. (CAN) NR DROOPING TO 97 WITHOUT RECOVERY UNDER POWER AND OVER SPEEDING TO 107 WHEN POWER REDUCED. - [SDR CA030312016](https://openairdocs.org/sdr/CA030312016), Feb 12, 2003: BEARING. MAKING METAL. (CAN) DURING A FLIGHT THE ENGINE CHIP LIGHT ILLUMINATED, THE PILOT LANDED AND THE LOWER CHIP PLUG WAS INSPECTED AND HAD SHINY PARTICLES ON IT. THE AIRCRAFT WAS - [SDR CA030210004](https://openairdocs.org/sdr/CA030210004), Jan 30, 2003: SERVO. LEAKING. (CAN) HYDRAULIC SERVO LEAKING. REMOVED FOR REPAIR. - [SDR CA030127001](https://openairdocs.org/sdr/CA030127001), Jan 13, 2003: TURBINE. SEIZED. (CAN) DURING FIRST START OF THE ENGINE, FOLLOWING A TURBINE CHANGE, MAIN ROTOR BLADES INITIALLY STARTED TURNING BUT THEN STOPPED BEFORE ENGINE ACCELERATED TO ID - [SDR CA020412012](https://openairdocs.org/sdr/CA020412012), Apr 6, 2002: BUSHING. WORN. (CAN) TRANSMISSION STOP MOUNT HAS WORN BUSHINGS. REPLACED. - [SDR CA011211013](https://openairdocs.org/sdr/CA011211013), Dec 4, 2001: STRUT. CRACKED. (CAN) CRACK FOUND ON UPPER PART OF STRUT AROUND THE BRACE ATTACHMENT HOLE. - [SDR CA010725022](https://openairdocs.org/sdr/CA010725022), Jul 3, 2001: ARM. DAMAGED. (CAN) FOUND NUT OF ACTUATOR ARM LOOSE IN ARM. UNIT REPLACED AND AIRCRAFT RETURNED TO SERVICE AFTER ADJUSTMENTS. - [SDR CA010725023](https://openairdocs.org/sdr/CA010725023), Jul 3, 2001: FITTING. CRACKED. (CAN) THE FITTING HAD TO BE REPLACED DUE TO CRACK. IT APPEARS TO HAVE CRACKED DUE TO INCORRECT INSTALLATION. THERE WAS A 100 INCH GAP BETWEEN THE LONGERON AND T - [SDR CA010725031](https://openairdocs.org/sdr/CA010725031), Jul 3, 2001: HOSE. LEAKING. (CAN) DURING REFUELING OPERATION, FUEL WAS OBSERVED LEAKING FROM TANK VENT HOSE ASSEMBLY WHEN TANK WAS FILLED TO CAPACITY. HOSE APPEARS TO HAVE DETERIORATED WIT - [SDR CA010704025](https://openairdocs.org/sdr/CA010704025), Jun 28, 2001: SHAFT. CORRODED. (CAN) DURING AN UNSCHEDULED MAINTENANCE REMOVAL OF THE UNIT IT WAS NOTED THAT THERE WAS EXCESSIVE PITTING CORROSION ON THE INNER SHAFT IN THE AREA WHERE THE FEL - [SDR CA000511016](https://openairdocs.org/sdr/CA000511016), May 4, 2000: BEARING. MAKING METAL. (CAN) NR 1 COMPRESSOR ROLLER BEARING MAKING METAL. - [SDR CA000511026](https://openairdocs.org/sdr/CA000511026), Feb 17, 2000: HOOK. WRONG PART. (CAN) ROTORCRAFT WAS CARRYING A SKIDOO ON THE CARGO HOOK WHEN THE PILOT FELT IT RELEASE. RETURNED TO BASE WHERE THE HOOK AND MECHANICAL AND ELECTRICAL RELEASES - [SDR CA000209070](https://openairdocs.org/sdr/CA000209070), Jan 30, 2000: MAST. BLISTERED. (CAN) INTERNAL EXAMINATION OF THE MAST REVEALED CORROSION APPROX 1/2 TO 2/3 UP FROM THE BOTTOM SIDE OF THE MAST BORE. CADMIUM PLATING APPEARED TO BE SEPARATING - [SDR CA990817025](https://openairdocs.org/sdr/CA990817025), Aug 6, 1999: IGNITER. FAILED. (CAN) ROTORCRAFT WOULD NOT START. PROBLEM WAS WITH FAULTY IGNITER PLUG. - [SDR CA990531004](https://openairdocs.org/sdr/CA990531004), May 13, 1999: COMPRESSOR. FAILED. (CAN) IN CRUISE AT 5,300 FEET, WITH AUTO-LIGHT AND ANTI-ICE SELECTED ON, A LOUD EXPLOSION WAS HEARD FOLLOWED BY AN IMMEDIATE YAW TO THE LEFT. THE ENGINE HORN AL All 66: https://openairdocs.org/engine/allison-250-c20r-2/reports.md ## STCs that may be installed (OpenAirDocs) (5) 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 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 --- 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.