# Allison 250-C30 - Type: Engine model (FAA registry) - Registry code: 03097 - Manufacturer (registry): ALLISON - Model: 250-C30 - Engine type: Turbo-shaft - Power: 650 hp - Data sheet: [TCDS E1GL](https://openairdocs.org/tcds/E1GL) (OpenAirDocs) - Holder: Rolls-Royce Corporation - Installed in: 5 registered aircraft - Page: https://openairdocs.org/engine/allison-250-c30 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 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 2006-20-07](https://openairdocs.org/ad/2006-20-07): Adds an additional life limit for third- and fourth-stage turbine wheels · Rolls-Royce 250-C30, 250-C30G, 250-C30G/2 and 11 more. Effective Nov 2, 2006 - [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 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 88-07-06](https://openairdocs.org/ad/88-07-06): Gas Producer Support Pressure Oil Tube Assembly · Rolls-Royce 250-C30, 250-C30M, 250-C30P and 2 more. Effective Mar 30, 1988 - [AD 86-20-13](https://openairdocs.org/ad/86-20-13): External Splines · Rolls-Royce 250-C28B, 250-C28C, 250-C30 and 9 more. Effective Dec 3, 1986 - [AD 86-19-12](https://openairdocs.org/ad/86-19-12): Gas Producer Turbine Rotor · Rolls-Royce 250-C30, 250-C30G, 250-C30G/2 and 7 more. Effective Oct 3, 1986 - [AD 85-25-07 R1](https://openairdocs.org/ad/85-25-07-R1): Outer Combustion Case Assembly · Rolls-Royce 250-C28, 250-C28B, 250-C28C and 10 more. Effective Aug 15, 1986 - [AD 85-25-08](https://openairdocs.org/ad/85-25-08): Compressor Mount Assembly · Rolls-Royce 250-C28B, 250-C28C, 250-C30 and 2 more. Effective Jan 6, 1986 - [AD 84-24-54 R2](https://openairdocs.org/ad/84-24-54-R2): Gas Producer Turbine Rotor · Rolls-Royce 250-C30, 250-C30P, 250-C30R (T703-AD-700) and 1 more. Effective Jan 6, 1986 - [AD 85-06-51](https://openairdocs.org/ad/85-06-51): Magnetic Plugs · Rolls-Royce 250-C30 and 250-C30S. Effective May 10, 1985 - [AD 84-17-51](https://openairdocs.org/ad/84-17-51): Turbine Rotor Assembly · Rolls-Royce 250-C30 and 250-C30S. Effective Dec 26, 1984 - [AD 81-13-12 R1](https://openairdocs.org/ad/81-13-12-R1): 4th Stage Turbine Nozzle Assembly · Rolls-Royce 250-C30, 250-C30P and 250-C30S. Effective Sep 26, 1983 - [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 79-16-06](https://openairdocs.org/ad/79-16-06): Accessory Drive Gearbox · Rolls-Royce 250-C28, 250-C28B, 250-C28C and 10 more. Effective Jan 11, 1980 - [AD 79-06-05](https://openairdocs.org/ad/79-06-05): Overspeed Control System · Rolls-Royce 250-C28B and 250-C30. Effective Mar 26, 1979 Historical (superseded or no longer in force): - [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 ## Information bulletins (advisory) (1) - [SAIB NE-06-52](https://openairdocs.org/saib/NE-06-52): . Issued Jul 6, 2006 ## Registered aircraft (5) - [N19FF](https://openairdocs.org/aircraft/N19FF): [Heliservice LLC](https://openairdocs.org/faa-owner/HELISERVICE%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 2010, S/N 0718FF - [N530X](https://openairdocs.org/aircraft/N530X): [Oxford Police Department](https://openairdocs.org/faa-owner/OXFORD%20POLICE%20DEPARTMENT), [Oxford, AL](https://openairdocs.org/faa-place/AL/Oxford), built 1994, S/N 0112FF - [N860MC](https://openairdocs.org/aircraft/N860MC): [Manatee County Mosquito Control District](https://openairdocs.org/faa-owner/MANATEE%20COUNTY%20MOSQUITO%20CONTROL%20DISTRICT), [Ellenton, FL](https://openairdocs.org/faa-place/FL/Ellenton), built 1992, S/N 0086FF - [N951CP](https://openairdocs.org/aircraft/N951CP): [City Of Cleveland](https://openairdocs.org/faa-owner/CITY%20OF%20CLEVELAND), [Cleveland, OH](https://openairdocs.org/faa-place/OH/Cleveland), built 2000, S/N 0549E - [N96KB](https://openairdocs.org/aircraft/N96KB): [Hlh Leasing LLC](https://openairdocs.org/faa-owner/HLH%20LEASING%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1989, S/N 0608FF ## NTSB investigations None matched to aircraft with this engine model. ## FAA accident and incident reports None matched to aircraft with this engine model. ## Service difficulty reports (402, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR EVCA03312026](https://openairdocs.org/sdr/EVCA03312026), Mar 25, 2026: BATTERY. UNSERVICEABLE. ELECTRICAL FAILURE, COMMS, NAV, AUTO PILOT. - [SDR EVCA20250623001](https://openairdocs.org/sdr/EVCA20250623001), Jun 23, 2025: PUMP. FAILED. HYDRAULIC FAILURE - [SDR EVCA20240903001](https://openairdocs.org/sdr/EVCA20240903001), Sep 2, 2024: BLOWER MOTOR. ODOR. STRONG ELECTRICAL BURNING SMELL IN CABIN. TURNED OFF THE AC AND THE SMELL WENT AWAY. - [SDR EVCA202408120001](https://openairdocs.org/sdr/EVCA202408120001), Aug 6, 2024: ATTACH FITTING. CRACKED. UPPER LEFT TAILBOOM ATTACHMENT FITTING, TAILBOOM SIDE, CRACKED FROM EDGE TO EDGE ACROSS TWO FWD OUTBOARD RIVETS - [SDR EVCA20240810001](https://openairdocs.org/sdr/EVCA20240810001), Jul 31, 2024: STIFFENER. CRACKED. THE STATION 145 CLIP IS CRACKED BY A RIVET HOLE ON THE RIGHT HAND SIDE. - [SDR EVCA20240506001](https://openairdocs.org/sdr/EVCA20240506001), May 3, 2024: ENGINE. ODOR. ABORT DUE TO STRONG FUEL SMELL WITHIN AIRCRAFT - [SDR YTRA2024012500001](https://openairdocs.org/sdr/YTRA2024012500001), Jan 24, 2024: ENGINE. SHUTDOWN. IN FLIGHT ENGINE SHUTDOWN. - [SDR YTRA202402020001](https://openairdocs.org/sdr/YTRA202402020001), Jan 24, 2024: BLADES. SEPARATED. 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 - [SDR EVCA202310110001](https://openairdocs.org/sdr/EVCA202310110001), Oct 10, 2023: UNKNOWN. UNKNOWN. 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 ELEC - [SDR EVCA09262023](https://openairdocs.org/sdr/EVCA09262023), Sep 26, 2023: FRAME. CRACKED. 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 T - [SDR 2023FA0000571](https://openairdocs.org/sdr/2023FA0000571), Sep 14, 2023: FUEL CELL. ABNORMAL. 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 SUSPE - [SDR YV3R2023100200581](https://openairdocs.org/sdr/YV3R2023100200581), Sep 1, 2023: WIRE HARNESS. MALFUNCTIONED. CUSTOMER REPORTED HARNESS ASSEMBLY P/N: F049-012 MALFUNCTIONED, N1 INDICATOR FLUCTUATING DURING FLIGHT. - [SDR EVCA202303220001](https://openairdocs.org/sdr/EVCA202303220001), Mar 22, 2023: PAN. LEAKING. 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), Nov 2, 2022: HOOK. FAILED. DURING SIDE PULL OPERATIONS, THE SIDE PULL HOOK SHAFT ASSEMBLY SHEARED IN HALF AND DEPARTED THE AIRCRAFT. VISUAL INSPECTIONS INDICATE METALLURGY ISSUES IN THE A - [SDR EVCA20220825001](https://openairdocs.org/sdr/EVCA20220825001), Aug 24, 2022: UNKNOWN. ODOR. 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 - [SDR 2020FA0000167](https://openairdocs.org/sdr/2020FA0000167), Aug 11, 2021: FUEL CELL. LEAKING. LEFT FUEL CELL DEVELOPED LEAK DUE TO RUBBING WITH VERTICAL SUPPORTS AT CENTER BEAM STRUCTURE. INSTALLED ANTI-CHAFF TAPE TO ALL VERTICAL STIFFENERS. REPLACED FUE - [SDR YV3R2020092900355](https://openairdocs.org/sdr/YV3R2020092900355), Sep 24, 2020: DUAL TACHOMETER. DEFECTIVE. CUSTOMER REPORTED DUAL TACHOMETER ASSEMBLY P/N: F792-1 NEEDLES STICK OCCASIONALLY DURING START-UP. - [SDR EVCA202009183](https://openairdocs.org/sdr/EVCA202009183), Sep 17, 2020: COMBUSTION LINER. CRACKED. DURING INSPECTION, CRACKS WERE VISUALLY FOUND ON THE ENGINE COMBUSTION LINER. - [SDR YV3R201911220214](https://openairdocs.org/sdr/YV3R201911220214), Nov 5, 2019: SENSOR. DEFECTIVE. CUSTOMER REPORTED SENSOR ASSEMBLY P/N: G768-3 IS DEFECTIVE. - [SDR 2020FA0000043](https://openairdocs.org/sdr/2020FA0000043), Jul 18, 2019: RING. CRACKED. 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. TH - [SDR CA190814007](https://openairdocs.org/sdr/CA190814007), Jul 17, 2019: CLAMP. RUPTURED. (CAN) INITIAL INSTALLATION OF STARTER/GENERATOR P/N: RR30000412, WITH ORIGINAL QAD CLAMP ALWAYS INSTALLED IN ACCORDANCE WITH MANUFACTURER RECOMMENDATIONS OPERAT - [SDR CA190403018](https://openairdocs.org/sdr/CA190403018), Apr 3, 2019: MOUNT. CRACKED. (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), Mar 4, 2019: BEARING. SEIZED. DURING EXTREME COLD WEATHER, SWASHPLATE UNIBALL SEIZED ON M/R DRIVESHAFT CAUSING STIFF COLLECTIVE FORCES. - [SDR H44R2016051300001](https://openairdocs.org/sdr/H44R2016051300001), May 11, 2016: COVER PLATE. WORN. 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 - [SDR 2016FA0000011](https://openairdocs.org/sdr/2016FA0000011), Dec 30, 2015: ANGLE. CRACKED. 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, - [SDR CA151009003](https://openairdocs.org/sdr/CA151009003), Oct 8, 2015: SHAFT. SEIZED. (CAN) WHILE TROUBLESHOOTING, AN UNCOMMANDED TORQUE OSCILLATION IN FLIGHT WHICH WAS DISCOVERED TO BE A TURBINE PROBLEM, THE ANOMALY WITH THE RECENTLY REPLACED GO - [SDR CA151005009](https://openairdocs.org/sdr/CA151005009), Oct 2, 2015: LINE. COLLAPSED. (CAN) INLET HOSE FOR FUEL, COLLAPSED CAUSING THE NR 1 ENGINE TO FLAMEOUT. - [SDR CA150706012](https://openairdocs.org/sdr/CA150706012), Jun 24, 2015: JAM-NUT. LOOSE. (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 - [SDR HQPR2015FA0000080](https://openairdocs.org/sdr/HQPR2015FA0000080), Feb 26, 2015: DRIVE GEAR. FAILED. 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 - [SDR EVCA20140717001](https://openairdocs.org/sdr/EVCA20140717001), Jul 12, 2014: MOUNT. CORRODED. 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), Jun 26, 2014: TURBINE WHEEL. FAILED. (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 HELI - [SDR CA140627014](https://openairdocs.org/sdr/CA140627014), Jun 25, 2014: NUT. MISSING. (CAN) TURBINE ATTACH HARDWARE FOUND LOOSE AND 1 MISSING. - [SDR Y3AR2014FA0000403](https://openairdocs.org/sdr/Y3AR2014FA0000403), Jun 18, 2014: COMBUSTION CASE. LEAKING. 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), May 6, 2014: NUT. CRACKED. (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. FU - [SDR YTRA20140313001](https://openairdocs.org/sdr/YTRA20140313001), Mar 12, 2014: ENGINE. MAKING METAL. THE PILOT MADE A PRECAUTIONARY LANDING DUE TO AN ENG CHIP LIGHT ILLUMINATION. - [SDR 8MHR201311050001](https://openairdocs.org/sdr/8MHR201311050001), Nov 5, 2013: COMBUSTION LINER. FAILED. 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 - [SDR 2013FA0000574](https://openairdocs.org/sdr/2013FA0000574), Sep 6, 2013: DIFFUSER. CRACKED. 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. - [SDR CA131022003](https://openairdocs.org/sdr/CA131022003), Jul 31, 2013: SWASHPLATE. DAMAGED. (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 FAC - [SDR AC2A07907102013](https://openairdocs.org/sdr/AC2A07907102013), Jul 10, 2013: COMPRESSOR. STALLED. 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 - [SDR ALGA050820137398](https://openairdocs.org/sdr/ALGA050820137398), May 7, 2013: STRAP. DETERIORATED. FOUND STRAP MATERIAL DETERIORATED AND WIRES EXPOSED ON STRAP. - [SDR 2012FA0000814](https://openairdocs.org/sdr/2012FA0000814), Dec 7, 2012: SKIN. CRACKED. 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 - [SDR 2012FA0000769](https://openairdocs.org/sdr/2012FA0000769), Nov 7, 2012: LONGERON. CRACKED. CRACK FOUND ON LONGERON, ORIGINATING FROM UPPER FWD OTBD RIVET AT BS 228. - [SDR ALGA2012110729129](https://openairdocs.org/sdr/ALGA2012110729129), Nov 6, 2012: UNKNOWN. UNKNOWN. 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 - [SDR H5FA2012F00177](https://openairdocs.org/sdr/H5FA2012F00177), Oct 3, 2012: BLADE. BENT. TAIL ROTOR BLADE T/E SKIN DEFORMED AT CORDWISE BALANCE WEIGHT. - [SDR AC2A201210010001](https://openairdocs.org/sdr/AC2A201210010001), Oct 1, 2012: COMBUSTION CASE. CRACKED. 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 WA - [SDR EVCA201207300033](https://openairdocs.org/sdr/EVCA201207300033), Jul 30, 2012: STRUCTURE. DELAMINATED. FOUND DELAMINATION ON FWD TUB DURING INSPECTION. - [SDR AC2A66K07172012](https://openairdocs.org/sdr/AC2A66K07172012), Jul 17, 2012: B-NUT. LOOSE. 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 - [SDR EVCA201206270031](https://openairdocs.org/sdr/EVCA201206270031), Jun 19, 2012: COLLECTOR. CRACKED. ON ROUTINE INSPECTION FOUND CRACKS IN THE REPAIR WELDS ON THE ENGINE EXHAUST COLLECTOR ASSEMBLY. - [SDR ALGA2012060802](https://openairdocs.org/sdr/ALGA2012060802), Jun 4, 2012: OIL SYSTEM. LOW PRESSURE. 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 PATTER - [SDR 2012F00097](https://openairdocs.org/sdr/2012F00097), May 4, 2012: BLADE. DENTED. 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. All 402: https://openairdocs.org/engine/allison-250-c30/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 SE00057AT](https://openairdocs.org/stc/SE00057AT): Installation of Aeronautical Accessories, Inc., Pc Safety Valve Kit. 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 SE00026EN](https://openairdocs.org/stc/SE00026EN): Installation of Pratt & Whitney Engine Services Inc. IntelliStart Plus Electronic Control Unit (ECU), P/N DPU-K-010 on 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.