# Allison 250-C28 - Type: Engine model (FAA registry) - Registry code: 03113 - Manufacturer (registry): ALLISON - Model: 250-C28 - Engine type: Turbo-shaft - Power: 500 hp - Data sheet: [TCDS E1GL](https://openairdocs.org/tcds/E1GL) (OpenAirDocs) - Holder: Rolls-Royce Corporation - Installed in: 0 registered aircraft - Page: https://openairdocs.org/engine/allison-250-c28 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 2006-16-04](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 2005-20-11](https://openairdocs.org/ad/2005-20-11): Airfoils at the hub and shroud of third-stage turbine wheels · Rolls-Royce 250-C28, 250-C28B and 250-C28C. Effective Oct 18, 2005 - [AD 2004-14-02](https://openairdocs.org/ad/2004-14-02): SN third-stage turbine wheels · Rolls-Royce 250-C28, 250-C28B and 250-C28C. Effective Jul 26, 2004 - [AD 2002-06-08](https://openairdocs.org/ad/2002-06-08): Third Stage Turbine Wheels · Rolls-Royce 250-C28, 250-C28B and 250-C28C. Effective Apr 26, 2002 - [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 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 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 Effective Jan 11, 1980 Historical (superseded or no longer in force): - [AD 2004-24-09](https://openairdocs.org/ad/2004-24-09) (historical): Fuel nozzle · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 40 more.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 ## Registered aircraft None registered with this engine model now. ## 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 (70, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR EVCA201811271](https://openairdocs.org/sdr/EVCA201811271), Nov 24, 2018: ENGINE. FLAMED OUT. ENGINE FAILED WHEN THROTTLE ROLLED TO IDLE DURING AUTOROTATION SPEED CHECK. PERFORMED AUTOROTATION LANDING. AIRCRAFT WAS INSPECTED WITH NO FUEL LEAKS. PERFORMED - [SDR C9PA201711030001](https://openairdocs.org/sdr/C9PA201711030001), Nov 3, 2017: PACKING. LEAKING. PILOT DETECTED FUEL ODOR IN CABIN. FOUND THE FUEL SWITCH PACKING LEAKING. - [SDR YTRA2016060715801](https://openairdocs.org/sdr/YTRA2016060715801), Jun 6, 2016: FUEL CONTROL. FAILED. IN THE COURSE OF A PRACTICE AUTOROTATION, THE ENGINE FLAMED OUT WHEN THE THROTTLE WAS ROLLED TO THE IDLE DETENT POSITION. - [SDR CA150327010](https://openairdocs.org/sdr/CA150327010), Mar 26, 2015: SKID. CRACKED. (CAN) DURING REMOVAL OF GROUND HANDLING WHEELS THE RT SKID TUBE WAS FOUND TO BE CRACKED AROUND THE COMPLETE CIRCUMFERENCE OF THE SKID TUBE AT THE FORWARD GROUND - [SDR EVCA201304220040](https://openairdocs.org/sdr/EVCA201304220040), Apr 22, 2013: BULKHEAD. CRACKED. RT BULKHEAD ASSY AT FS 146 CRACKED AT INBD SECTION NEAR THE BOX BEAM ASSY. - [SDR EVCA201304230041](https://openairdocs.org/sdr/EVCA201304230041), Apr 22, 2013: CHANNEL. CRACKED. AT FS 155 CHANNEL CRACKED AT BOTH ENGINE MOUNT ATTACHMENT FITTINGS. - [SDR CA121106008](https://openairdocs.org/sdr/CA121106008), Nov 4, 2012: MAGNETIC SEAL. LEAKING. (CAN) MAIN ROTOR TRANSMISSION INPUT MAG SEAL LEAKING. SEAL REPLACED. - [SDR 3HCR03222012](https://openairdocs.org/sdr/3HCR03222012), Mar 22, 2012: BUSHING. MISINSTALLED. GOVERNOR ALLOWS ENGINE TO OVERSPEED. FAILED SHOP TEST. DIASSEMBLED AND FOUND UNIT IMPROPERLY ASSEMBLED. SPOOL BUSHING ANTI-ROTATION TANG WAS ENGAGED IN LEVER SL - [SDR 2011FA0000574](https://openairdocs.org/sdr/2011FA0000574), Sep 3, 2011: STUD. WORN. ACFT WAS IN CRUISE FLT, PILOT NOTICED OIL PRESSURE DEMINISHING, PILOT INITIATED LANDING. ONCE ACFT WAS ON THE GROUND PILOT NOTICED OIL PRESSURE AT FLUCTUATING F - [SDR YTRA1105401](https://openairdocs.org/sdr/YTRA1105401), Feb 22, 2011: ENGINE. MALFUNCTIONED. IN CRUISE FLIGHT THE PILOT REPORTED HIGH FREQUENCY VIBRATION AND WHINING NOISE FROM THE ENGINE COMPARTMENT. THIS WAS FOLLOWED BY AN ENGINE CHIP LIGHT INDICATION - [SDR EVCA00007](https://openairdocs.org/sdr/EVCA00007), Sep 21, 2010: CHIN BUBBLE. DETACHED. APPROX 3 NM NW OF AIRPORT HEARD A NOISE. A FEW MOMENTS PASSED AND THEN THERE WAS A "POP", A QUICK PRESSURE CHANGE AND AIRFLOW INTO THE COCKPIT. DISCOVERED THE G - [SDR EVCA00006](https://openairdocs.org/sdr/EVCA00006), Jun 2, 2010: BULKHEAD. CRACKED. DURING A ROUTINE INSP, MECHANIC FOUND CRACK ON BULKHEAD STA NR 142, WL 61, ON THE RT SIDE GENERATING FROM A NUTPLATE SCREW LOCATION. - [SDR EVCA00003](https://openairdocs.org/sdr/EVCA00003), Apr 24, 2010: SUPPORT. CRACKED. DURING A ROUTINE INSP, MECHANIC FOUND RT (PILOT) SUPPORT ASSY CRACKED. SUPPORT ASSY R & R. - [SDR EVCA731D](https://openairdocs.org/sdr/EVCA731D), Mar 9, 2010: ATTACH FITTING. CRACKED. DURING A ROUTINE INSP, MX FOUND UPPER LT ATTACHMENT FITTING ON FUSELAGE AFT BULKHEAD CRACKED. ATTACHMENT FITTING R & R. - [SDR CA070706002](https://openairdocs.org/sdr/CA070706002), Jul 5, 2007: SCROLL. WARPED. (CAN) DURING A GROUND RUN AN AIR LEAK WAS FOUND AT THE SCROLL DIFFUSER SPLIT LINE. COMPRESSOR ASSY WAS CHANGED OUT. (TC NR 20070706002) - [SDR CA070706004](https://openairdocs.org/sdr/CA070706004), Jul 5, 2007: FUEL CONTROL. UNSERVICEABLE. (CAN) FUEL CONTROL WAS INTERMITTENT ON ENGINE LIGHT-OFF DURING A START. FUEL CONTROL CHANGED OUT. (TC NR 20070706004) - [SDR CA070601003](https://openairdocs.org/sdr/CA070601003), May 28, 2007: FUEL CELL. LEAKING. (CAN) FUEL SMELL NOTED. INSPECTION FOUND SMALL FUEL LEAK. FUEL CELL REMOVED SENT OUT FOR REPAIR, REINSTALLED. (TC NR 20070601003) - [SDR CA070404007](https://openairdocs.org/sdr/CA070404007), Apr 4, 2007: FUEL CELL. LEAKING. (CAN) RETURNING FROM A FLIGHT IT WAS NOTED THERE WAS A FUEL ODOR IN THE REAR CABIN. INVESTIGATING DETERMED THE LT FWD FUEL CELL HAD A SMALL LEAK. FUEL CELL WAS - [SDR CA060808005](https://openairdocs.org/sdr/CA060808005), Jul 19, 2006: SCROLL. CRACKED. (CAN) HIGH TOT WAS NOTICED IN CRUISE. ON RETURNING A POWER CHECK WAS CARRIED OUT AND LOW POWER WAS DETECTED. A HAIT LINE CRACK WAS IDENTIFIED BY VISUAL INSPECTI - [SDR B652006F00000](https://openairdocs.org/sdr/B652006F00000), Apr 13, 2006: BOLT. SHEARED. DURING COURSE OF AN ACCIDENT INVESTIGATION, IT WAS NOTED THAT BOLTS THAT CONNECT TAIL ROTOR DRIVE SHAFT TO INPUT THOMAS COUPLING OF INTERMEDIATE GEARBOX WERE SH - [SDR 2005FA0001637](https://openairdocs.org/sdr/2005FA0001637), Nov 16, 2005: OIL TANK. LEAKING. 206-061-505-109 ENGINE OIL RESERVOIR BEGAN TO LEAK ENGINE OIL. - [SDR 2005FA0001638](https://openairdocs.org/sdr/2005FA0001638), Nov 16, 2005: OIL TANK. LEAKING. 206-061-505-109 ENGINE OIL RESERVOIR BEGAN TO LEAK ENGINE OIL - [SDR B65A106298](https://openairdocs.org/sdr/B65A106298), Oct 12, 2005: SHIELD. BROKEN. SHIELD, BROKEN AND REPLACED. - [SDR B65A106299](https://openairdocs.org/sdr/B65A106299), Oct 12, 2005: SHIELD. BROKEN. SHIELD, BROKEN AND REPLACED. - [SDR B65A106300](https://openairdocs.org/sdr/B65A106300), Oct 12, 2005: SHIELD. BROKEN. SHIELD, BROKEN AND REPLACED. - [SDR CA051018006](https://openairdocs.org/sdr/CA051018006), Oct 12, 2005: RESTRAINT. DELAMINATED. DELAMINATION FOUND ON AFT TRANSMISSIN MOUNT ELASTOMERIC. MOUNT CHANGED. - [SDR B65A106278](https://openairdocs.org/sdr/B65A106278), Sep 29, 2005: HYDRAULIC SYSTEM. LEAKING. LEAKING HYDRAULIC UNIT. - [SDR B65A106130](https://openairdocs.org/sdr/B65A106130), Sep 21, 2005: METER. UNSERVICEABLE. TORQUE KEEPS FLUCTUATING. - [SDR B65A106213](https://openairdocs.org/sdr/B65A106213), Sep 21, 2005: CONTROL UNIT. UNSERVICEABLE. CONTROL UNIT IS CAUSING AN UNCONTROLLABLE LATERAL INPUT. - [SDR CA051004004](https://openairdocs.org/sdr/CA051004004), Sep 6, 2005: CONTACTOR. BURNED. (CAN) DURING CRUISE PORTION OF A SHORT (15 MIN) CREW TRANSFER FLIGHT, THE PILOT AND 2 PASSENGERS ABOARD SMELLED/SAW FUMES/SMOKE IN COCKPIT. ELECTRICAL SYSTEMS W - [SDR YTRR104956](https://openairdocs.org/sdr/YTRR104956), Jul 25, 2005: FUEL FILTER. CRACKED. FILTER HEAD WEBBING INSIDE WAS CRACKED. REPLACED FILTER HEAD ASSY. - [SDR CA050706009](https://openairdocs.org/sdr/CA050706009), Jun 27, 2005: CARTRIDGE. NOISY. (CAN) FUEL BOOST PUMP MAKING NOISES. PUMP CHANGED. - [SDR B652005F00000](https://openairdocs.org/sdr/B652005F00000), May 20, 2005: SWITCH. STUCK. WHEN PERFORMING THE FUNCTIONAL TEST OF THE HYDRAULIC SYSTEM, CHAPTER 43-14, PG 24 OF THE MM. UNABLE TO GET THE HYDRAULIC UNIT TO SWITCH OVER TO THE NR 2 POSITIO - [SDR HE66100341](https://openairdocs.org/sdr/HE66100341), Apr 17, 2005: FIREWALL. CRACKED. FIREWALL IS CRACKED BY FASTNERS AND HAS BEEN REPAIRED SEVERAL TIMES BEFORE. INTEGRITY IS COMPROMISED AND DO NOT WANT ENGINE TO INGEST FOD. - [SDR HE66100337](https://openairdocs.org/sdr/HE66100337), Apr 16, 2005: SKID. UNSERVICEABLE. RIVETS PULLED AND GOUGES IN BOTTOM OF TUBE. - [SDR HE66099998](https://openairdocs.org/sdr/HE66099998), Mar 24, 2005: STARTER GEN. UNSERVICEABLE. NR 2 ENG FAILED TO START. STARTER GENERATOR UNSERVICEABLE. - [SDR PG9R97953](https://openairdocs.org/sdr/PG9R97953), Nov 5, 2004: FUEL NOZZLE. CRACKED. FUEL NOZZLE SPRAY SHROUD CRACKED. A NEW MATERIAL SHOULD BE USED FOR THE SPRAY SHROUD. (K) - [SDR HE66097817](https://openairdocs.org/sdr/HE66097817), Oct 21, 2004: TORQUEMETER. UNSERVICEABLE. FLUCTUATING OVER 40 PERCENT WITH NO CHANGE IN N1 OR TOT. - [SDR HE66097244](https://openairdocs.org/sdr/HE66097244), Sep 10, 2004: BEARING. WORN. BEARINGS ARE WORN CAUSING EXCESSIVE PLAY. - [SDR HE66096553](https://openairdocs.org/sdr/HE66096553), Jul 29, 2004: SEAT. TORN. SEAT TORN, CUSHION HAS NO SUPPORT. - [SDR HE66096552](https://openairdocs.org/sdr/HE66096552), Jul 21, 2004: SEAT. CRUSHED. CRUSHABLE SEATS WERE CRUSHED. - [SDR HE66096545](https://openairdocs.org/sdr/HE66096545), Jul 16, 2004: PRESSURE SWITCH. UNSERVICEABLE. PRESSURE SWITCH FAILED AND REPLACED. - [SDR ALGA093984](https://openairdocs.org/sdr/ALGA093984), Mar 21, 2004: BLADE. CORRODED. FOUND MAIN ROTOR TRAILING EDGE EXTRUSION EXFOLIATED APPROXIMATELY 2.5. - [SDR ALG2004F00001](https://openairdocs.org/sdr/ALG2004F00001), Nov 11, 2003: B-NUT. LOOSE. IN FLIGHT SMELLED SLIGHT ODOR OF FUEL. ON POST FLIGHT SAW DRIPS OF FUEL ON LINES AROUND FUEL CONTROL. MAINTENANCE FOUND B-NUT ON FUEL CONTROL INLET FROM PUMP SE - [SDR 2003FA0001118](https://openairdocs.org/sdr/2003FA0001118), Oct 17, 2003: BEARING. FAILED. DURING ROUTINE DAILY INSPECTION OF HELICOPTER USED IN EMS, MECHANIC NOTICED NR 5 TAIL ROTOR BEARING GREASE SEAL HAD SEPARATED FROM BEARING. FRAGMENTS OF THE PHE - [SDR ALG2003F00081](https://openairdocs.org/sdr/ALG2003F00081), Aug 27, 2003: ENGINE. FAILED. DURING TAKE OFF, THE PILOT CALLED ON THE PHONE AND REPORTED THAT DURING TAKE OFF AND CLIMB AFTER FUELING, THE AIRCRAFT EXPERIENCED FOUR LOUD BANGS AND ENGINE CH - [SDR CA030528005](https://openairdocs.org/sdr/CA030528005), May 12, 2003: FRAME. CRACKED. (CAN) CRACK FOUND IN AFT FUSELAGE FRAME. CRACK APPROXIMATELY .3750 INCH IN LENGTH LOCATED ABOVE UPPER RT TAILBOOM ATTACH BOLT MOUNTING BOLT HOLE. FOUND DURING 1 - [SDR HE66084852](https://openairdocs.org/sdr/HE66084852), Feb 28, 2003: IGNITER BOX. DEFECTIVE. NR 1 ENGINE WOULD NOT START, EXCITER BOX WAS NOT PUTTING OUT REPLACED - [SDR CA030204014](https://openairdocs.org/sdr/CA030204014), Jan 20, 2003: LEVER. FAILED. (CAN) REQUIRED BOLT PN NAS6604D8 (AS PER 206L IPC) WOULD NOT FIT IN EXISTING HOLE OF FUEL CONTROL LEVER PN 206064713101 WITHOUT ENLARGING HOLE. - [SDR HEEA083304](https://openairdocs.org/sdr/HEEA083304), Jan 9, 2003: BLEED VALVE. FAILED. LOUD BANG FROM COMPRESSOR ON TAKEOFF FOLLOWED BY 4 MORE BANGS. REPLACED WITH SERVICEABLE BLEED VALVE. All 70: https://openairdocs.org/engine/allison-250-c28/reports.md ## STCs that may be installed (OpenAirDocs) (3) 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 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 ## PMA parts (OpenAirDocs) (424, first 50) Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this engine model on its data sheet, so check the FAA record before relying on it. Newest first. - [2549171](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID118302742720230907182151.0001): Power Turbine Governor. Honeywell International Inc. · PMA PQ1222NM · Replaces 23076419 · Mar 10, 2023 - [6843361HT](https://drs.faa.gov/browse/excelExternalWindow/FEFFC83511F3456B862585500062B6AE.0001): Cage, Ball Bearing-1.024 ID X .312 Wide (and Oversizes). HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6843361 · Apr 30, 2019 - [2537525HT](https://drs.faa.gov/browse/excelExternalWindow/FE2CFD93295E4A9586258550006312B3.0001): Shaft, Shouldered, Eccentric. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2537525 · Apr 30, 2019 - [2539533HT](https://drs.faa.gov/browse/excelExternalWindow/FDF710A0D9BAAADD8625855000632B9C.0001): Bearing, Sintered. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539533 · Apr 30, 2019 - [951190HT](https://drs.faa.gov/browse/excelExternalWindow/FC8B8869AAFBA24A8625855000632D54.0001): Pin, Sraight, Headless. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 951190 · Apr 30, 2019 - [2521745HT](https://drs.faa.gov/browse/excelExternalWindow/FB5437CD05C715928625855000631007.0001): Pin, Straight, Headed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2521745 · Apr 30, 2019 - [2523123HT](https://drs.faa.gov/browse/excelExternalWindow/F7ED1DCCD5F726178625855000635A58.0001): Diaphragm. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2523123 · Apr 30, 2019 - [47070HT](https://drs.faa.gov/browse/excelExternalWindow/F7B8FBB13C3754EE8625855000633D7A.0001): Body, Fuel Nozzle. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 47070 · Apr 30, 2019 - [6875104HT](https://drs.faa.gov/browse/excelExternalWindow/F7976EEE0864C0FC8625855000629713.0001): Washer, Flat-.190I.D. X.312X.031 THK, AMS 5516. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6875104 · Apr 30, 2019 - [H250-10113](https://drs.faa.gov/browse/excelExternalWindow/F79503304C39D6A78625855000638D3A.0001): Race, Bearing Inner, 20mm I.D.. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces M250-10113 · Apr 30, 2019 - [6856986HT](https://drs.faa.gov/browse/excelExternalWindow/F71D7C1A9289065F862585500062C13F.0001): Poppet & Seat Assy. Anti-Icing Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6856986 · Apr 30, 2019 - [23073355](https://drs.faa.gov/browse/excelExternalWindow/F65CBF7AF67669F38625855000633C45.0001): Valve, Servo-Compressor Bleed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 23073355 · Apr 30, 2019 - [197498HT](https://drs.faa.gov/browse/excelExternalWindow/F58363F6C29A0E2C8625855000636674.0001): Nut, Self-Locking. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 197498 · Apr 30, 2019 - [23004513HT](https://drs.faa.gov/browse/excelExternalWindow/F536F4331CB36E2186258550006314B5.0001): Seal, Plain-Encased. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 23004513 · Apr 30, 2019 - [2539728HT](https://drs.faa.gov/browse/excelExternalWindow/F443067B0718FDB0862585500062E5F1.0001): Seat, Bellows. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539728 · Apr 30, 2019 - [6853463HT](https://drs.faa.gov/browse/excelExternalWindow/F3D6B2D89D6786D486258550006375D6.0001): Tube Assy., Scav. -Oil- Gasifier Turbine Support to Accessory Hsg. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6853463 · Apr 30, 2019 - [6896098HT](https://drs.faa.gov/browse/excelExternalWindow/F32E4B1478DF1131862585500062F93E.0001): Seal, Labyrinth-Gasifier Turbine Forward. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6896098 · Apr 30, 2019 - [6808392HT](https://drs.faa.gov/browse/excelExternalWindow/F327858FDC6FA3FD862585500062EFB3.0001): Nut-Spanner, 27/32-32Thd. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6808392 · Apr 30, 2019 - [6898657HT](https://drs.faa.gov/browse/excelExternalWindow/F1BBE1994BAD8750862585500063383B.0001): Ring, Seal-Comp Disch Tube. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6898657 · Apr 30, 2019 - [6844169HT](https://drs.faa.gov/browse/excelExternalWindow/EEA08B5CE9D50D858625855000632609.0001): Tube Assy., Fuel Control to Fire Shield. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6844169 · Apr 30, 2019 - [6877277HT](https://drs.faa.gov/browse/excelExternalWindow/ED89264E3E345B9F86258550006327C1.0001): Tube Assy., Press. Fuel Control to Accumulator. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6877277 · Apr 30, 2019 - [2539170HT](https://drs.faa.gov/browse/excelExternalWindow/ED10E7C1F7943A5C862585500063453A.0001): Lever Assembly, CAM Follower Lever. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539170 · Apr 30, 2019 - [6890040HT](https://drs.faa.gov/browse/excelExternalWindow/EAB4262CF5DCF6B1862585500062F849.0001): Shield Assy., Turbine Nozzle 1st Stage. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6890040 · Apr 30, 2019 - [2539641HT](https://drs.faa.gov/browse/excelExternalWindow/EAAC9B4FF82FDB5186258550006333E2.0001): Spring, Helical, Extension. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539641 · Apr 30, 2019 - [6856984HT](https://drs.faa.gov/browse/excelExternalWindow/E8ADCF843602D53C862585500062BF66.0001): Body, Valve-Anti-Icing. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6856984 · Apr 30, 2019 - [6876030HT](https://drs.faa.gov/browse/excelExternalWindow/E79234C7BBF9CF68862585500062FEEB.0001): Stud, Shouldered, Stepped-.250-28x.500-16x1.374LG.. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6876030 · Apr 30, 2019 - [6876925HT](https://drs.faa.gov/browse/excelExternalWindow/E50B21DEC0893A14862585500062E284.0001): Tube Assy., Oil Filter Inlet. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6876925 · Apr 30, 2019 - [23032283HT](https://drs.faa.gov/browse/excelExternalWindow/E406BEB5470E1FE7862585500062DD76.0001): Pinion Bearing Cage Power Turbine. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 23032283 · Apr 30, 2019 - [6844043HT](https://drs.faa.gov/browse/excelExternalWindow/E3DD22AFB6589BF4862585500062A71B.0001): Tube, Oil Transfer. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6844043 · Apr 30, 2019 - [6899050HT](https://drs.faa.gov/browse/excelExternalWindow/E20ACA4FAC9A2EAB862585500062863D.0001): Valve-Poppet, CPRSR Bleed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6899050 · Apr 30, 2019 - [336132HT](https://drs.faa.gov/browse/excelExternalWindow/E07190E2A02F10498625855000636717.0001): Tapered Pin, Split. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 336132 · Apr 30, 2019 - [6853446HT](https://drs.faa.gov/browse/excelExternalWindow/DF8E0D4DBF0B1EA9862585500062B018.0001): Shaft, Gear-Oil Pump. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6853446 · Apr 30, 2019 - [6899051HT](https://drs.faa.gov/browse/excelExternalWindow/DF724C028D881CAF8625855000628826.0001): Valve, Servo-Compressor Bleed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6899051 · Apr 30, 2019 - [2520570HT](https://drs.faa.gov/browse/excelExternalWindow/DC7000B2192F14888625855000633F53.0001): Rod. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2520570 · Apr 30, 2019 - [6810448HT](https://drs.faa.gov/browse/excelExternalWindow/DAF595A1CC57D376862585500062E13F.0001): Bushing-Sleeve .625 x .815 x .437. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6810448 · Apr 30, 2019 - [6876741HT](https://drs.faa.gov/browse/excelExternalWindow/DAD145C0601221568625855000636F8D.0001): Stud, Welding- Percussion .190-32 UNJF-3A. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6876741 · Apr 30, 2019 - [951388HT](https://drs.faa.gov/browse/excelExternalWindow/DA66A5873365EBC9862585500063070A.0001): Packing, Preformed O Ring. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 951388 · Apr 30, 2019 - [2539034HT](https://drs.faa.gov/browse/excelExternalWindow/D854B45671A2734E862585500063447F.0001): Weight. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539034 · Apr 30, 2019 - [6848471HT](https://drs.faa.gov/browse/excelExternalWindow/D56C5A805DBB39DB8625855000634EEA.0001): Tube, Assy., Pressure, Oil Check Valve To Fire Shield. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6848471 · Apr 30, 2019 - [6890909HT](https://drs.faa.gov/browse/excelExternalWindow/D3CFDDD1AC5180DE862585500062896E.0001): Jet, Compressor Bleed Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6890909 · Apr 30, 2019 - [6852176HT](https://drs.faa.gov/browse/excelExternalWindow/D2E81DF924CBABBF862585500062BB43.0001): Guide Assy., Poppet-Anti-Icing Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6852176 · Apr 30, 2019 - [2537956HT](https://drs.faa.gov/browse/excelExternalWindow/D20327EF0618F354862585500063323E.0001): Pin, Shoulder, Headless. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2537956 · Apr 30, 2019 - [951390HT](https://drs.faa.gov/browse/excelExternalWindow/D0B5B6870CEFAA55862585500063078F.0001): Packing, Preformed O Ring. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 951390 · Apr 30, 2019 - [6896437HT](https://drs.faa.gov/browse/excelExternalWindow/CF4D9A2F43D117368625855000630188.0001): Strainer Assy.-Compressor-Bleed Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6896437 · Apr 30, 2019 - [6877736HT](https://drs.faa.gov/browse/excelExternalWindow/CEBECB98B3BC3712862585500062ABD4.0001): Seal, Labyrinth Stator-Gasifier Turbine Brg.. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6877736 · Apr 30, 2019 - [2520561HT](https://drs.faa.gov/browse/excelExternalWindow/C93D07A85055A49E86258550006358AA.0001): Roller. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2520561 · Apr 30, 2019 - [2522105HT](https://drs.faa.gov/browse/excelExternalWindow/C831F72FFA3592EE8625855000633FF3.0001): Spacer. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2522105 · Apr 30, 2019 - [6898784HT](https://drs.faa.gov/browse/excelExternalWindow/C6CDF20EDBAAC95086258550006303A4.0001): Adapter, Splined-Turbine 2nd Stage. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6898784 · Apr 30, 2019 - [23055441HT](https://drs.faa.gov/browse/excelExternalWindow/C535DADA36BDD92A8625855000638DD3.0001): Key, 2nd Stage Turbine Nozzle Assembly. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 23055441 · Apr 30, 2019 - [6843357HT](https://drs.faa.gov/browse/excelExternalWindow/C1F14E92D4A100BD862585500062B466.0001): Cage, Bearing-Plain, 2.678 ID X .590 Wide & Oversizes. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6843357 · Apr 30, 2019 All of them: https://openairdocs.org/engine/allison-250-c28/pma.md --- 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.