# Allison 250-C47B

- Type: Engine model (FAA registry)
- Registry code: 03109
- Manufacturer (registry): ALLISON
- Model: 250-C47B
- Engine type: Turbo-shaft
- Power: 650 hp
- Data sheet: [TCDS E1GL](https://openairdocs.org/tcds/E1GL) (OpenAirDocs)
- Holder: Rolls-Royce Corporation
- Installed in: 15 registered aircraft
- Page: https://openairdocs.org/engine/allison-250-c47b

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 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 2004-24-04](https://openairdocs.org/ad/2004-24-04): Hydromechanical unit (HMU) Power Lever Angle (PLA) potentiometer · Rolls-Royce 250-C30R/3, 250-C30R/3M, 250-C47B and 1 more. Effective Jan 3, 2005
- [AD 98-10-03](https://openairdocs.org/ad/98-10-03): Hydromechanical Unit · Rolls-Royce 250-C47B. Effective May 26, 1998
- [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

Historical (superseded or no longer in force):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
- [AD 2003-13-10](https://openairdocs.org/ad/2003-13-10) (historical): Hydromechanical unit (HMU) power lever angle (PLA) · 250-C30R/3, 250-C30R/3M, 250-C47B and 1 more. Effective Jul 15, 2003
- [AD 97-21-09](https://openairdocs.org/ad/97-21-09) (historical): Engine Main Electrical Harness Assembly · 250-C47B. Effective Dec 3, 1997
- [AD 96-24-09](https://openairdocs.org/ad/96-24-09) (historical): Engine Main Electrical Harness Assembly · 250-C47B. Effective Nov 25, 1996

## Information bulletins (advisory) (2)

- [SAIB NE-06-12R1](https://openairdocs.org/saib/NE-06-12R1): . Issued Jan 13, 2006
- [SAIB NE-06-12](https://openairdocs.org/saib/NE-06-12) (historical): . Issued Dec 2, 2005

## Registered aircraft (15)

- [N119MF](https://openairdocs.org/aircraft/N119MF): [Mercy Flights Inc](https://openairdocs.org/faa-owner/MERCY%20FLIGHTS%20INC), [Medford, OR](https://openairdocs.org/faa-place/OR/Medford), built 2014, S/N 54550
- [N366AP](https://openairdocs.org/aircraft/N366AP): [Bank Of Utah Trustee](https://openairdocs.org/faa-owner/BANK%20OF%20UTAH%20TRUSTEE), [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City), built 2009, S/N 53935
- [N38BL](https://openairdocs.org/aircraft/N38BL): [Helicopters Inc](https://openairdocs.org/faa-owner/HELICOPTERS%20INC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1999, S/N 53368
- [N406AP](https://openairdocs.org/aircraft/N406AP): [A&P Helicopters Inc](https://openairdocs.org/faa-owner/A%26P%20HELICOPTERS%20INC), [Richvale, CA](https://openairdocs.org/faa-place/CA/Richvale), built 1999, S/N 53357
- [N406TD](https://openairdocs.org/aircraft/N406TD): [Hfs Heli V LLC](https://openairdocs.org/faa-owner/HFS%20HELI%20V%20LLC), [New York, NY](https://openairdocs.org/faa-place/NY/New%20York), built 2006, S/N 53745
- [N407FH](https://openairdocs.org/aircraft/N407FH): [Vertol Systems Company Inc](https://openairdocs.org/faa-owner/VERTOL%20SYSTEMS%20COMPANY%20INC), [Destin, FL](https://openairdocs.org/faa-place/FL/Destin), S/N 53026
- [N407NY](https://openairdocs.org/aircraft/N407NY): [New York City Police Aviation Unit](https://openairdocs.org/faa-owner/NEW%20YORK%20CITY%20POLICE%20AVIATION%20UNIT), [Brooklyn, NY](https://openairdocs.org/faa-place/NY/Brooklyn), built 1996, S/N 53061
- [N417PH](https://openairdocs.org/aircraft/N417PH): [Phi Aviation LLC](https://openairdocs.org/faa-owner/PHI%20AVIATION%20LLC), [Lafayette, LA](https://openairdocs.org/faa-place/LA/Lafayette), built 1996, S/N 53038
- [N434PH](https://openairdocs.org/aircraft/N434PH): [Phi Health LLC](https://openairdocs.org/faa-owner/PHI%20HEALTH%20LLC), [Tempe, AZ](https://openairdocs.org/faa-place/AZ/Tempe), built 2007, S/N 53773
- [N45TV](https://openairdocs.org/aircraft/N45TV): [Redding Air Services Inc](https://openairdocs.org/faa-owner/REDDING%20AIR%20SERVICES%20INC), [Redding, CA](https://openairdocs.org/faa-place/CA/Redding), built 1998, S/N 53295
- [N493AE](https://openairdocs.org/aircraft/N493AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), S/N 53275
- [N499AE](https://openairdocs.org/aircraft/N499AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1999, S/N 53367
- [N561SF](https://openairdocs.org/aircraft/N561SF): [N390sf LLC](https://openairdocs.org/faa-owner/N390SF%20LLC), [Chandler, AZ](https://openairdocs.org/faa-place/AZ/Chandler), built 2000, S/N 53456
- [N670RL](https://openairdocs.org/aircraft/N670RL): [Gm Leasing Company LLC](https://openairdocs.org/faa-owner/GM%20LEASING%20COMPANY%20LLC), [Broussard, LA](https://openairdocs.org/faa-place/LA/Broussard), built 2000, S/N 53413
- [N864H](https://openairdocs.org/aircraft/N864H): [Hillcrest Aircraft Co Inc](https://openairdocs.org/faa-owner/HILLCREST%20AIRCRAFT%20CO%20INC), [Lewiston, ID](https://openairdocs.org/faa-place/ID/Lewiston), built 1996, S/N 53017

## NTSB investigations (3)

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 ENG23LA045](https://openairdocs.org/ntsb/ENG23LA045), Sep 21, 2023: Bell 407 (N406TD), Linden, NJ, incident, no damage. Probable cause: The fracture of the upper-left tail boom attachment bolt due to abnormal loading of the bolt caused by a gap and misalignment between the upper-left longeron and the tail boom. Contributing to this…
- [NTSB WPR13TA205](https://openairdocs.org/ntsb/WPR13TA205), Apr 25, 2013: Bell BHT407 (N937GR), Big Fork, MT, substantial damage. Probable cause: The pilot’s failure to maintain helicopter control while maneuvering over mountainous terrain in strong up/downdrafts and possible mountain wave activity, which resulted in a loss of tail rotor…
- [NTSB CEN10LA078](https://openairdocs.org/ntsb/CEN10LA078), Dec 25, 2009: Bell Helicopter Textron Canada 407 (N600CE), Decatur, TX, substantial damage. Probable cause: The pilot's inadequate preflight inspection and the momentary loss of engine power due to snow or ice ingestion.

## 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 20180211002389I](https://openairdocs.org/incident/20180211002389I), Feb 11, 2018: Bell 407 (N434PH), Lancaster, TX, Minor damage. Helicopter departed heliport (73T) enroute to lnc airport. The purpose of the flight was to conduct emergency procedures training, practicing touchdown…
- [Incident 20170803016879I](https://openairdocs.org/incident/20170803016879I), Aug 3, 2017: Bell 407 (N434PH), Midlothian, TX, Minor damage. Crew was training a stuck pedal maneuver when the main rotor blades contacted the left hand vertical fin.
- [Accident 20130425005599A](https://openairdocs.org/incident/20130425005599A), Apr 25, 2013: Bell 407 (N937GR), Big Fork, MT, Substantial damage. Aircraft on public use mission for sheriffs office attempted to land on mt aeneas, MT. Elev 7254 MSL. During high recon pilot stated he was at 65 knots IAS in…

## Service difficulty reports (1,403, newest 50)

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

- [SDR EVCA20260915001](https://openairdocs.org/sdr/EVCA20260915001), Sep 14, 2026: DUCT. COLLAPSED. ELECTRICAL ODOR IN CABIN FOLLOWED BY AIR CONDITIONER FAILURE. THE HOSE IN BETWEEN THE EVAPORATOR AND AFT BLOWER COLLAPSED CAUSING THE AFT BLOWER CB TO POP.
- [SDR QMLA2026091320064](https://openairdocs.org/sdr/QMLA2026091320064), Sep 13, 2026: BYPASS VALVE. FAILED. UPON LANDING NOTICED COPIOUS AMOUNTS OF SMOKE BILLOWING FROM THE EXHAUST. SHUTDOWN AND NOTED THAT THE ENGINE OIL SITE GLASS WAS EMPTY. REPLACED ENGINE TURBINE A
- [SDR QMLA20260812](https://openairdocs.org/sdr/QMLA20260812), Aug 12, 2026: INDICATOR. INOPERATIVE. RECEIVED AND INSTALLED REPLACEMENT MGT INDICATOR. APPLIED GROUND POWER AND THE UNIT PASSED THE LCD TEST. AFTER ENGINE START THE MGT INDICATED ZERO. AIRCRAFT WAS
- [SDR 2026FA0000635](https://openairdocs.org/sdr/2026FA0000635), Aug 8, 2026: BLOWER MOTOR. BURNED OUT. SHORTLY AFTER DEPARTURE, TURNED ON THE BLOWER. AFTER A FEW MINUTES CREW REPORTED A BURNING RUBBER SMELL. I TURNED OFF THE BLOWER AND THE SMELL DISSIPATED. I TUR
- [SDR 2026FA0000617](https://openairdocs.org/sdr/2026FA0000617), Jul 31, 2026: BLOWER MOTOR. BURNED OUT. CREW SMELLED A BURNING OR SMOKY SMELL COMING FROM AC VENTS. TURNED OFF AC AND BLOWER MOTOR, PULLED CIRCUIT BREAKER FOR AC, OPENED VENTS AND WINDOWS. AIRCRAFT LA
- [SDR QMLA2026072520049](https://openairdocs.org/sdr/QMLA2026072520049), Jul 23, 2026: DUAL TACHOMETER. DEGRADED. NEEDLES ON DUAL TACH NOT ALIGNED WHILE RUNNING. FADEC DEGRADED/RESTART FAULT LIGHT ILLUMINATED AFTER STARTUP. REMOVED AND REPLACED DEFECTIVE DUAL TACH GAUGE.
- [SDR QMLA2026071720048](https://openairdocs.org/sdr/QMLA2026071720048), Jul 17, 2026: UNKNOWN. ODOR. ELECTRICAL ODOR NOTICED DURING FLIGHT BACK TO BASE. PERFORMED OPS CHECKS. UNABLE TO DUPLICATE SMELL. RTS
- [SDR QMLA2026071420046](https://openairdocs.org/sdr/QMLA2026071420046), Jul 13, 2026: ELEC CONNECTOR. PULLED. RESTART FAULT AND FADEC DEGRADED LIGHTS ILLUMINATED ON TAKE OFF. PULLED FAULT ADAPTOR ELEC CONNECTOR. CLEANED AND REINSTALLED. CLEARED CODE, OPS GROUND RUN GOOD
- [SDR EVCA202607011](https://openairdocs.org/sdr/EVCA202607011), Jul 1, 2026: WARNING LIGHT. FALSE ACTIVATION. DEPARTED HOSPITAL, XSMN CHIP LIGHT ILLUMINATED APPROX 2 MIN AFTER DEPARTURE. ABORTED FLIGHT, CONDUCTED PRECAUTIONARY EMERGENCY LANDING AT AIRPORT. REMOVED AND I
- [SDR EVCA20260714001](https://openairdocs.org/sdr/EVCA20260714001), Jun 21, 2026: MOTOR. FAULTED. AIRCRAFT DEPARTED THE BASE FOR A SCENE FLIGHT IN NASHVILLE ARKANSAS. APPROXIMATELY 5 MINUTES AFTER DEPARTURE CREW DESCRIBED SMELLING ELECTRICAL WIRES BURNING AL
- [SDR 2026F00115](https://openairdocs.org/sdr/2026F00115), May 20, 2026: ENGINE. SMOKE. THIS IS TO REPORT A NEW EVENT FOLLOWING SDR NO. 2120-0663. THE REPAIRED ENGINE WAS TAKEN OUT OF SERVICE FOR THE ENGINE SMOKE WHEN ENGINE TRANSITIONS FROM FLY TO
- [SDR EVCA20260511001](https://openairdocs.org/sdr/EVCA20260511001), May 8, 2026: BLOWER MOTOR. UNSERVICEABLE. SMOKE SMELL, AND VISUAL SMOKE IN CABIN. INSPECTED AIRCRAFT DETERMINED SMOKE SMELL TO BE COMING FROM AFT AC BLOWER MOTOR. REFERENCE AIR COMM ICA 407EC-200M-2.
- [SDR 2026F00095](https://openairdocs.org/sdr/2026F00095), Apr 30, 2026: HMU. FAULTED. PILOT GOT RESTART FAIL LIGHT ON CAUTION PANEL. TESTING UNIT REVEALED ERRATIC READINGS OF THE FUEL METERING VALVE POTENTIOMETER.
- [SDR 2026F00096](https://openairdocs.org/sdr/2026F00096), Apr 19, 2026: METERING VALVE. FAULTED. PILOT GOT RESTART FAULT ON CAUTION PANEL. CODES EXTRACTED WAS WFMVRTFLT INDICATING ISSUE WITH FUEL METERING VALVE POTENTIOMETER.
- [SDR 2026FA0000229](https://openairdocs.org/sdr/2026FA0000229), Mar 26, 2026: BRUSHES. WORN. FOUND ONE BRUSH ONLY OF FOUR, WORN TO METAL, CONTACTING ARMATURE. STARTER / GENERATOR, BELL P/N: 206-062-200-113, MFR P/N: 23081-018
- [SDR QMLA2026032120022](https://openairdocs.org/sdr/QMLA2026032120022), Mar 20, 2026: WIRE HARNESS. FAULTED. ON SHORT FINAL THE FADEC CHANNEL FAIL CAUTION LIGHT ILLUMINATED; IT WAS FOLLOWED BY THE CHECK INSTRUMENT WARNING LIGHT A SECOND LATER, THEN FINALLY THE FADEC MA
- [SDR QMLA2026031920020](https://openairdocs.org/sdr/QMLA2026031920020), Mar 19, 2026: SOLENOID VALVE. FAILED. HYDRAULIC SYSTEM FAIL CAS ILLUMINATED ON TOUCHDOWN.
- [SDR QMLA2026011120002](https://openairdocs.org/sdr/QMLA2026011120002), Jan 11, 2026: UNKNOWN. ODOR. MED CREW REPORTS A FUEL ODOR WHILE IN FLIGHT. PERFORMED VISUAL INSPECTION OF ALL VIABLE FUEL LINES, FUEL SUMPS, FUEL NOZZLE, AND FUEL FILTERS, IAW AMM DMC 407-A
- [SDR QMLA2025112820118](https://openairdocs.org/sdr/QMLA2025112820118), Nov 28, 2025: ENGINE. MAKING METAL. AIRCRAFT WAS APPROACHING STELLAR AIRPORT IN RENO, NV FOR FUEL WHEN THE ENGINE CHIP LIGHT CAME ON. PILOT LANDED AT THE AIRPORT AND CALLED MECHANICS. MECHANICS PU
- [SDR QMLA2025102320108](https://openairdocs.org/sdr/QMLA2025102320108), Oct 22, 2025: OIL FILTER. FAILED. ON CLIMB OUT, ENGINE OIL FILTER CAUTION LIGHT ILLUMINATED. PROCEDURE IS LAND AS SOON AS PRACTICAL. I WAS OVER A NUMBER OF BUILDING AND ALREADY HEADED FOR THE AI
- [SDR QMLA2025102120106](https://openairdocs.org/sdr/QMLA2025102120106), Oct 20, 2025: POTENTIOMETER. UNSERVICEABLE. A FADEC DEGRADE CAUTION LIGHT ILLUMINATED IN-FLT ENROUTE BACK TO HOMEBASE. AFTER NOTIFYING THE CREW OF THE EMERGENCY EVENT THAT OCCURRED, EXECUTED EMERGENCY PRO
- [SDR QMLA2025101420104](https://openairdocs.org/sdr/QMLA2025101420104), Oct 14, 2025: ENGINE. OVERSPEED. ENGINE OVERSPEED DURING FLIGHT.
- [SDR QMLA2025101120101](https://openairdocs.org/sdr/QMLA2025101120101), Oct 8, 2025: ENGINE. MAKING METAL. ENGINE CHIP LIGHT ILLUMINATED IN FLIGHT. UPON INSPECTION, ENGINE WAS FOUND TO BE MAKING METAL. AIRCRAFT CURRENTLY OOS,
- [SDR 2026FA0000095](https://openairdocs.org/sdr/2026FA0000095), Aug 7, 2025: FILTER. MISMANUFACTURED. PERFORMING TRANSMISSION OIL AND FILTER CHANGE, MECHANIC NOTED THAT NEW OIL FILTER WOULD NOT INSTALL ON THE FILTER BOSS. WENT THROUGH INVENTORY AND FOUND THAT A 
- [SDR 2026F00041](https://openairdocs.org/sdr/2026F00041), Jul 23, 2025: ENGINE. DAMAGED. UNKNOWN INTERNAL ENGINE COMPONENT CAUSING BURNING OF OIL AFTER ENGINE OVERHAUL AND REPLACEMENT OF ALL 4 TURBINE WHEELS. FIRST OCCURRENCE RECORDED AFTER SMOKE WA
- [SDR EVCA20250530001](https://openairdocs.org/sdr/EVCA20250530001), May 28, 2025: BLADE. DAMAGED. CRACK FOUND 3/8" FROM THE AFT BLADE BOLE AREA IN NON-REPAIRABLE AREA OF MAIN ROTOR BLADE.
- [SDR QMLA202504282005](https://openairdocs.org/sdr/QMLA202504282005), Apr 27, 2025: SEAL. LEAKING. CREW REPORTED A HAZE IN THE PASSENGER COMPARTMENT WHEN DEFROSTER SYSTEM WAS IN USE, DURING PREFLIGHT OIL WAS FOUND STREAKING OUT OF BLEED VALVE OUTLET/ EXHAUST 
- [SDR QMLA2025040920048](https://openairdocs.org/sdr/QMLA2025040920048), Apr 9, 2025: OIL SYSTEM. LEAKING. EXCESS OIL OBSERVED DRIPPING FROM AFT-MOST BOTTOM DRAIN TUBE.
- [SDR QMLA2025032720041](https://openairdocs.org/sdr/QMLA2025032720041), Mar 27, 2025: ROTOR HEAD. CRACKED. CRACK FOUND ON MAIN ROTOR HUB BEARING ADAPTER ASSY ON DIAMOND BLADE. REPLACED MRH ASSY.
- [SDR EVCA033025](https://openairdocs.org/sdr/EVCA033025), Mar 27, 2025: FUEL. ODOR. SMELLING FUEL ON TAKEOFF.
- [SDR EVCA2025013000002](https://openairdocs.org/sdr/EVCA2025013000002), Jan 30, 2025: ENGINE. FOD. SMOKE FROM HEATING SYSTEM WHEN HEAT IS ON. SMOKE CLEARS WHEN TURNED OFF. UPON INSPECTION OF ENGINE FOR SMOKE, FOUND ENGINE HAS FOD DAMAGE.
- [SDR 2VKA2025020553456](https://openairdocs.org/sdr/2VKA2025020553456), Jan 28, 2025: WASHER. CRACKED. WHILE CHANGING THE TRANSMISSION THE TECHNICIAN DISCOVERED ONE WASHER PN:140-007-25S22E6 CRACKED.
- [SDR EVCA2025011500001](https://openairdocs.org/sdr/EVCA2025011500001), Jan 14, 2025: BEARING. COKED. EXCESSIVE SMOKE COMING FROM ENGINE AT IDLE. FOUND HEAVY COKING ON THE OIL STRUT AND POOR DRAIN BACK FROM 6/7 BEARINGS. ENGINE WAS INSTALLED 53.9 HRS PRIOR TO EV
- [SDR 8LFA202501154001](https://openairdocs.org/sdr/8LFA202501154001), Jan 14, 2025: BEARING SEAL. LEAKING. IN FLIGHT, SMOKE ACCUMULATED IN THE CABIN COMING FROM THE HEATING SYSTEM. PILOT TURNED OFF THE HEATING SYSTEM AND SMOKE DISSIPATED. UPON LANDING, IT WAS FOUND #
- [SDR H44A202501070001](https://openairdocs.org/sdr/H44A202501070001), Dec 17, 2024: SEAL. FAILED. PILOT REPORTED INCREASE IN ENGINE OIL PRESSURE AND DECREASE IN TRANSMISSION PRESSURE. UPON FURTHER INSPECTION IT WAS DISCOVERED THAT THE NEWLY INSTALLED PTO SEA
- [SDR HDNA2024120200936](https://openairdocs.org/sdr/HDNA2024120200936), Dec 2, 2024: DISPLAY. BURNED OUT. PRIMARY FLIGHT DISPLAY HAD INTERNAL FAILURE RESULTING IN SMOKE COMING FROM SD CARD SLOTS. AIRCRAFT LANDED WITH NO OTHER FAULTS.
- [SDR QMLA2024112120145](https://openairdocs.org/sdr/QMLA2024112120145), Nov 21, 2024: OXYGEN BOTTLE. CRACKED. AN OVERHAULED GASEOUS MEDICAL O2 BOTTLE WAS FOUND WITH MANUFACTURING DEFECT OR CRACK AT NECK/REGULATOR FITTING. FOUND DURING LEAK CHECK AFTER INSTALLATION.
- [SDR QMLA2024102820139](https://openairdocs.org/sdr/QMLA2024102820139), Oct 25, 2024: ENGINE. MAKING METAL. ENGINE CHIP LIGHT IN-FLIGHT I ACCEPTED A PATIENT FLIGHT REQUEST FOR AN INTERFACILITY TRANSFER FROM PINE RIDGE HOSPITAL TO MONUMENT HEALTH IN RAPID CITY, SD. FLI
- [SDR QMLA2024102820140](https://openairdocs.org/sdr/QMLA2024102820140), Oct 25, 2024: UNKNOWN. FUMES. FUMES IN CABIN NOTED AND FLIGHT ABORTED RTB, ADJUSTED A/C DUCT ON AFT BLOWER MOTOR. OPS CHECKED GOOD. ALL MAINTENANCE COMPLETED.
- [SDR QMLA2024102120136](https://openairdocs.org/sdr/QMLA2024102120136), Oct 21, 2024: PUMP. FAULTED. PILOT REPORTED HYDRAULIC WHINE/GRIND ON LANDING 10/19/2024 @ 0930. MECHANIC PERFORMED INSPECTION OF HYDRAULIC SYSTEM, GROUND RUN, AND TEST FLIGHT, NO ABNORMAL N
- [SDR QMLA2024101120131](https://openairdocs.org/sdr/QMLA2024101120131), Oct 10, 2024: UNKNOWN. ODOR. SMELL OF ELECTRICAL BURNING IN FLIGHT AFT CABIN, NOTICED BY AIRCREW. INSPECTED AFT BAGGAGE COMPARTMENT, UPPER AVIONICS BAY INCLUDING WIRING AND RELAYS. GROUND R
- [SDR ZD4R202410040001](https://openairdocs.org/sdr/ZD4R202410040001), Oct 4, 2024: SHAFT. BROKEN. DISASSEMBLED GEARBOX AND FOUND 2 BROKEN TEETH ON TORQUEMETER GEARSHAFT. GEAR TEETH WERE LOCATED AT BOTTOM OF GEARBOX. MINOR METAL DEBRIS FOUND ON MAGNETIC CHIP 
- [SDR QMLA2024100120126](https://openairdocs.org/sdr/QMLA2024100120126), Sep 27, 2024: OIL SYSTEM. OVERTEMP. ENTERING CRUISE FLIGHT AFTER TAKEOFF, EOT TURNED RED AND INDICATED 109C. INITIATED RETURN FOR LANDING. EOT SHOWED 135C ON LANDING, BUT LOWERED DURING 2 MINUTE S
- [SDR QMLA2024092020121](https://openairdocs.org/sdr/QMLA2024092020121), Sep 20, 2024: SEALANT. DAMAGED. FUEL SMELL IN CABIN BY MED CREW, INSPECTED FOR FUEL LEAKS, NONE FOUND. REAPPLIED SEALANT TO PREVENT FUEL VENT FROM ENTERING CABIN. THIS AIRCRAFT HAS BEEN RETURN
- [SDR QMLA2024091820117](https://openairdocs.org/sdr/QMLA2024091820117), Sep 17, 2024: UNKNOWN. ODOR. DURING FLIGHT, I HEARD A POPPING SOUND AND SAW A FLASH ON THE LOWER PORTION OF THE CENTER CONSOLE FOLLOWED BY AN ELECTRICAL BURN SMELL. I IMMEDIATELY CHANGED MY
- [SDR HDNA20240916001](https://openairdocs.org/sdr/HDNA20240916001), Sep 13, 2024: UNKNOWN. ODOR. UPON INITIAL DEPARTURE FROM BASE PIC REPORTED THAT THE MEDICAL CREW NOTED STRONG SMELL OF FUEL IN THE CABIN. FLIGHT WAS ABORTED AND RETURNED TO BASE. RESPONDING
- [SDR EVCA202408250001](https://openairdocs.org/sdr/EVCA202408250001), Aug 25, 2024: DRAIN. CLOGGED. CREW NOTICED FUEL SMELL IN THE BACK OF THE AIRCRAFT DURING FLIGHT. FINDINGS: NO VISIBLE FUEL LEAKS FOUND IN CABIN, FUEL RESIDUE FOUND IN AFT FUSELAGE BOAT TAIL.
- [SDR QMLA2024081920102](https://openairdocs.org/sdr/QMLA2024081920102), Aug 17, 2024: BLOWER MOTOR. FAILED. CREW SMELLED BURNING ELECTRICAL OR BURNING RUBBER COMING OUT OF THE AIR CONDITION VENTS IN THE AFT PASSENGER COMPARTMENT. BURNING SMELL DISSIPATED WHEN AIR COND
- [SDR QMLA2024081920103](https://openairdocs.org/sdr/QMLA2024081920103), Aug 17, 2024: BLOWER MOTOR. FAILED. BURNING SMELL IN AFT CABIN WITH AIR CONDITIONING ON.
- [SDR QMLA2024081520099](https://openairdocs.org/sdr/QMLA2024081520099), Aug 13, 2024: UNKNOWN. FUMES. DURING CRUISE FLIGHT, NURSE SMELLED ELECTRICAL BURNING FUMES COMING FROM AIR CONDITIONER GASPER. RETURNED TO THE NEAREST SAFE LANDING AREA WHICH WAS BASE AND SH

All 1,403: https://openairdocs.org/engine/allison-250-c47b/reports.md

## STCs that may be installed (OpenAirDocs) (1)

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 SE578GL](https://openairdocs.org/stc/SE578GL): Installation of a fuel flow transducer. Shadin Avionics

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