# Service difficulty reports: Allison 250-C47B

A list on [Allison 250-C47B](https://openairdocs.org/engine/allison-250-c47b.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 29 · 1,403 reports

- [SDR EVCA20260915001](https://openairdocs.org/sdr/EVCA20260915001.md): Duct · collapsed · Sep 14, 2026 · N660AE · Bell 407 · Air Distribution System
  > 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.md): Bypass Valve · failed · Sep 13, 2026 · N293AM · Bell 407 · Engine (Turbine/Turboprop)
  > 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 ASSEMBLY, COMPETED AAIP INSPECTIONS, RII CHECKLIST, OPERATIONAL CHECKS, AIRCRAFT RETURNED TO REVENUE
- [SDR QMLA20260812](https://openairdocs.org/sdr/QMLA20260812.md): Indicator · inoperative · Aug 12, 2026 · N445SL · Bell 407 · Central Warning
  > 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 SHUTDOWN AND I PERFORMED AN MGT INDICATOR FUNCTIONAL CHECK WITH THE BARFIELD TURBINE TEMP TESTER. T
- [SDR 2026FA0000635](https://openairdocs.org/sdr/2026FA0000635.md): Blower Motor · burned out · Aug 8, 2026 · N409GA · Bell 407 · Air Distribution System
  > 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 TURNED ON THE AIR CONDITIONER TO SEE IF IT CAME BACK AND WE EXPERIENCED THE SAME SMELL. AFT BLOWER MOTO
- [SDR 2026FA0000617](https://openairdocs.org/sdr/2026FA0000617.md): Blower Motor · burned out · Jul 31, 2026 · N407BU · Bell 407 · Air Distribution Fan
  > 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 LANDED WITH NO OTHER FAULTS.
- [SDR QMLA2026072520049](https://openairdocs.org/sdr/QMLA2026072520049.md): Dual Tachometer · degraded · Jul 23, 2026 · N404LL · Bell 407 · Engine RPM Indicating System
  > 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.md): Unknown · odor · Jul 17, 2026 · N229AM · Bell 407 · Air Distribution System
  > ELECTRICAL ODOR NOTICED DURING FLIGHT BACK TO BASE. PERFORMED OPS CHECKS. UNABLE TO DUPLICATE SMELL. RTS
- [SDR QMLA2026071420046](https://openairdocs.org/sdr/QMLA2026071420046.md): Elec Connector · pulled · Jul 13, 2026 · N404LL · Bell 407 · Engine Fuel System Wiring
  > RESTART FAULT AND FADEC DEGRADED LIGHTS ILLUMINATED ON TAKE OFF. PULLED FAULT ADAPTOR ELEC CONNECTOR. CLEANED AND REINSTALLED. CLEARED CODE, OPS GROUND RUN GOOD. NO DEFECTS NOTED.
- [SDR EVCA202607011](https://openairdocs.org/sdr/EVCA202607011.md): Warning Light · false activation · Jul 1, 2026 · N728AE · Bell 407 · Main Rotor Drive System
  > DEPARTED HOSPITAL, XSMN CHIP LIGHT ILLUMINATED APPROX 2 MIN AFTER DEPARTURE. ABORTED FLIGHT, CONDUCTED PRECAUTIONARY EMERGENCY LANDING AT AIRPORT. REMOVED AND INSPECTED UPPER AND LOWER TRANS AND FREE WHEELING CHIP DETECTORS, REMOVED AND CHECKED FILTER, AND FOU
- [SDR EVCA20260714001](https://openairdocs.org/sdr/EVCA20260714001.md): Motor · faulted · Jun 21, 2026 · N102AE · Bell 407 · Air Distribution Fan
  > AIRCRAFT DEPARTED THE BASE FOR A SCENE FLIGHT IN NASHVILLE ARKANSAS. APPROXIMATELY 5 MINUTES AFTER DEPARTURE CREW DESCRIBED SMELLING ELECTRICAL WIRES BURNING ALONG WITH ALL AIR CONDITIONER BLOWERS STOPPING. UPON TROUBLESHOOTING THE SYSTEM IT WAS FOUND THAT THE
- [SDR 2026F00115](https://openairdocs.org/sdr/2026F00115.md): Engine · smoke · May 20, 2026 · N777ZA · Bell 407 · Engine (Turbine/Turboprop)
  > 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 IDLE. TROUBLESHOOTING WAS CARRIED OUT PER THE ROLLS ROYCE MANUAL. NO DISCREPANCIES WERE NOTED.
- [SDR EVCA20260511001](https://openairdocs.org/sdr/EVCA20260511001.md): Blower Motor · unserviceable · May 8, 2026 · N39AE · Bell 407 · Air Distribution Fan
  > 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.md): Hmu · faulted · Apr 30, 2026 · N670RL · Bell 407 · Fuel Control/Turbine Engines
  > 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.md): Metering Valve · faulted · Apr 19, 2026 · N660RL · Bell 407 · Fuel Controlling System
  > 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.md): Brushes · worn · Mar 26, 2026 · N407WF · Bell 407 · Starter-Generator
  > 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.md): Wire Harness · faulted · Mar 20, 2026 · N773AL · Bell 407 · Engine Fuel System Wiring
  > 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 MAINTENANCE LIGHT CAME ON FOLLOWED BY A MARRIED LOSS OF MY NR AND NP NEEDLES. MUCH LIKE A BIT TEST THE
- [SDR QMLA2026031920020](https://openairdocs.org/sdr/QMLA2026031920020.md): Solenoid Valve · failed · Mar 19, 2026 · N292AM · Bell 407 · Hydraulic System, Main
  > HYDRAULIC SYSTEM FAIL CAS ILLUMINATED ON TOUCHDOWN.
- [SDR QMLA2026011120002](https://openairdocs.org/sdr/QMLA2026011120002.md): Unknown · odor · Jan 11, 2026 · N772AL · Bell 407 · Air Distribution System
  > 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-24-00-00-130A-A. NO LEAKS NOTED AT THIS TIME.
- [SDR QMLA2025112820118](https://openairdocs.org/sdr/QMLA2025112820118.md): Engine · making metal · Nov 28, 2025 · N223AM · Bell 407 · Engine (Turbine/Turboprop)
  > 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 PULLED CHIP DETECTORS AND FOUND BOTH TO BE HEAVILY CONTAMINATED INCLUDING OIL SAMPLE.
- [SDR QMLA2025102320108](https://openairdocs.org/sdr/QMLA2025102320108.md): Oil Filter · failed · Oct 22, 2025 · N88YJ · Bell 407 · Turbine Engine Oil System
  > 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 AIRPORT AND CONTINUED TO LAND ON THE RAMP. INSPECTION AFTER SHUTDOWN SHOWED APPROPRIATE ENGINE OIL LEV
- [SDR QMLA2025102120106](https://openairdocs.org/sdr/QMLA2025102120106.md): Potentiometer · unserviceable · Oct 20, 2025 · N775AL · Bell 407 · Central Warning
  > A FADEC DEGRADE CAUTION LIGHT ILLUMINATED IN-FLT ENROUTE BACK TO HOMEBASE. AFTER NOTIFYING THE CREW OF THE EMERGENCY EVENT THAT OCCURRED, EXECUTED EMERGENCY PROCEDURE IAW BH407HP RFM, WHICH WAS TO ENSURE ACFT STABILIZED & MINIMIZING CONTROL INPUTS, FADEC RES
- [SDR QMLA2025101420104](https://openairdocs.org/sdr/QMLA2025101420104.md): Engine · overspeed · Oct 14, 2025 · N911CN · Bell 407 · Engine (Turbine/Turboprop)
  > ENGINE OVERSPEED DURING FLIGHT.
- [SDR QMLA2025101120101](https://openairdocs.org/sdr/QMLA2025101120101.md): Engine · making metal · Oct 8, 2025 · N189AM · Bell 407 · Engine (Turbine/Turboprop)
  > 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.md): Filter · mismanufactured · Aug 7, 2025 · N723SF · Bell 407 · Oil Servicing
  > 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 TOTAL OF 10 FILTERS FROM OUR STOCK WOULD NOT FIT ON THE FILTER BOSS.
- [SDR 2026F00041](https://openairdocs.org/sdr/2026F00041.md): Engine · damaged · Jul 23, 2025 · N777ZA · Bell 407 · Engine (Turbine/Turboprop)
  > UNKNOWN INTERNAL ENGINE COMPONENT CAUSING BURNING OF OIL AFTER ENGINE OVERHAUL AND REPLACEMENT OF ALL 4 TURBINE WHEELS. FIRST OCCURRENCE RECORDED AFTER SMOKE WAS OBSERVED COMING FROM THE EXHAUST WHEN THE AIRCRAFT WAS AT IDLE AND DURING SHUTDOWN AFTER A FLIGHT
- [SDR EVCA20250530001](https://openairdocs.org/sdr/EVCA20250530001.md): Blade · damaged · May 28, 2025 · N190AE · Bell 407 · Main Rotor Blades
  > 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.md): Seal · leaking · Apr 27, 2025 · N184AM · Bell 407 · Compressor Bleed Valve
  > 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 ON TOP OF THE ENGINE COWLING.
- [SDR QMLA2025040920048](https://openairdocs.org/sdr/QMLA2025040920048.md): Oil System · leaking · Apr 9, 2025 · N927AM · Bell 407 · Turbine Engine Oil System
  > EXCESS OIL OBSERVED DRIPPING FROM AFT-MOST BOTTOM DRAIN TUBE.
- [SDR QMLA2025032720041](https://openairdocs.org/sdr/QMLA2025032720041.md): Rotor Head · cracked · Mar 27, 2025 · N184AM · Bell 407 · Main Rotor Head
  > CRACK FOUND ON MAIN ROTOR HUB BEARING ADAPTER ASSY ON DIAMOND BLADE. REPLACED MRH ASSY.
- [SDR EVCA033025](https://openairdocs.org/sdr/EVCA033025.md): Fuel · odor · Mar 27, 2025 · N481AE · Bell 407 · Air Distribution System
  > SMELLING FUEL ON TAKEOFF.
- [SDR EVCA2025013000002](https://openairdocs.org/sdr/EVCA2025013000002.md): Engine · fod · Jan 30, 2025 · N906GF · Bell 407 · Engine (Turbine/Turboprop)
  > 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.md): Washer · cracked · Jan 28, 2025 · N561SF · Bell 407 · Fuselage Main, Structure
  > WHILE CHANGING THE TRANSMISSION THE TECHNICIAN DISCOVERED ONE WASHER PN:140-007-25S22E6 CRACKED.
- [SDR EVCA2025011500001](https://openairdocs.org/sdr/EVCA2025011500001.md): Bearing · coked · Jan 14, 2025 · N512MT · Bell 407 · Engine (Turbine/Turboprop)
  > 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 EVENT. ENGINE REQUESTED TO BE REMOVED AND RETURNED TO KEYSTONE FOR EVALUATION.
- [SDR 8LFA202501154001](https://openairdocs.org/sdr/8LFA202501154001.md): Bearing Seal · leaking · Jan 14, 2025 · N448LF · Bell 407 · Engine (Turbine/Turboprop)
  > 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 #1 BEARING WAS LEAKING AROUND THE SEAL RESULTING IN THE SMOKE IN THE BLEED AIR SYSTEM.
- [SDR H44A202501070001](https://openairdocs.org/sdr/H44A202501070001.md): Seal · failed · Dec 17, 2024 · N401TD · Bell 407 · Turbine Engine Oil System
  > PILOT REPORTED INCREASE IN ENGINE OIL PRESSURE AND DECREASE IN TRANSMISSION PRESSURE. UPON FURTHER INSPECTION IT WAS DISCOVERED THAT THE NEWLY INSTALLED PTO SEALS FAILED.
- [SDR HDNA2024120200936](https://openairdocs.org/sdr/HDNA2024120200936.md): Display · burned out · Dec 2, 2024 · N407NA · Bell 407 · Central Display
  > 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.md): Oxygen Bottle · cracked · Nov 21, 2024 · N135AM · Bell 407 · Portable Oxygen System
  > 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.md): Engine · making metal · Oct 25, 2024 · N450AM · Bell 407 · Engine (Turbine/Turboprop)
  > 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. FLIGHT WAS UNEVENTFUL ENROUTE TO THE HOSPITAL AND THE PATIENT LEG. THE PATIENT WAS DROPPED OFF AND WE
- [SDR QMLA2024102820140](https://openairdocs.org/sdr/QMLA2024102820140.md): Unknown · fumes · Oct 25, 2024 · N696AM · Bell 407 · Air Distribution System
  > 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.md): Pump · faulted · Oct 21, 2024 · N911CN · Bell 407 · Hydraulic Pump (Electric/Engine), Main
  > PILOT REPORTED HYDRAULIC WHINE/GRIND ON LANDING 10/19/2024 @ 0930. MECHANIC PERFORMED INSPECTION OF HYDRAULIC SYSTEM, GROUND RUN, AND TEST FLIGHT, NO ABNORMAL NOISES OR OPERATION NOTED. LATER THAT EVENING PILOT REPORTED HUMMING/VIBRATION ON APPROACH, MECHANICS
- [SDR QMLA2024101120131](https://openairdocs.org/sdr/QMLA2024101120131.md): Unknown · odor · Oct 10, 2024 · N408SH · Bell 407 · Air Distribution System
  > SMELL OF ELECTRICAL BURNING IN FLIGHT AFT CABIN, NOTICED BY AIRCREW. INSPECTED AFT BAGGAGE COMPARTMENT, UPPER AVIONICS BAY INCLUDING WIRING AND RELAYS. GROUND RUNS AND OPS CHECK GOOD, NO DEFECTS NOTED. THIS AIRCRAFT HAS BEEN RETURNED TO REVENUE SERVICE. REF# M
- [SDR ZD4R202410040001](https://openairdocs.org/sdr/ZD4R202410040001.md): Shaft · broken · Oct 4, 2024 · N36VA · Bell 407 · Accessory Gearboxes
  > 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 DETECTORS. MINOR DAMAGE TO GEARBOX COVER AND HOUSING ASSEMBLY.
- [SDR QMLA2024100120126](https://openairdocs.org/sdr/QMLA2024100120126.md): Oil System · overtemp · Sep 27, 2024 · N214AM · Bell 407 · Engine Oil Temperature
  > 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 SHUTDOWN. REMOVED AND REPLACED THE ENGINE.
- [SDR QMLA2024092020121](https://openairdocs.org/sdr/QMLA2024092020121.md): Sealant · damaged · Sep 20, 2024 · N193AM · Bell 407 · Standard Practices/Structures
  > 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 RETURNED TO REVENUE SERVICE.
- [SDR QMLA2024091820117](https://openairdocs.org/sdr/QMLA2024091820117.md): Unknown · odor · Sep 17, 2024 · N772AL · Bell 407 · Air Distribution System
  > 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 COURSE TO A SAFE LANDING LOCATION. ONCE THE LANDING PHASE WAS SET I CHECKED ALL MY INSTRUMENTS AND
- [SDR HDNA20240916001](https://openairdocs.org/sdr/HDNA20240916001.md): Unknown · odor · Sep 13, 2024 · N922TG · Bell 407 · Air Distribution System
  > 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 TECHNICIAN PERFORMED A DETAILED OF THE FUEL CAP, FUEL PLATES, FUEL SYSTEM, AND ENGINE COMPARTMENTS.
- [SDR EVCA202408250001](https://openairdocs.org/sdr/EVCA202408250001.md): Drain · clogged · Aug 25, 2024 · N485AE · Bell 407 · Fuselage Main, Structure
  > 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. SMALL DRAIN FOR THAT AREA WAS CLOGGED CLEARED OBSTRUCTION AND CLEANED AREA NO OTHER LEAKS NOTED.
- [SDR QMLA2024081920102](https://openairdocs.org/sdr/QMLA2024081920102.md): Blower Motor · failed · Aug 17, 2024 · N338AM · Bell 407 · Air Distribution Fan
  > CREW SMELLED BURNING ELECTRICAL OR BURNING RUBBER COMING OUT OF THE AIR CONDITION VENTS IN THE AFT PASSENGER COMPARTMENT. BURNING SMELL DISSIPATED WHEN AIR CONDITIONING TURNED OFF. BURNING SMELL POSSIBLY COMING FROM THE AFT BLOWER MOTOR. BURNING SMELL IN CP. A
- [SDR QMLA2024081920103](https://openairdocs.org/sdr/QMLA2024081920103.md): Blower Motor · failed · Aug 17, 2024 · N189AM · Bell 407 · Air Distribution Fan
  > BURNING SMELL IN AFT CABIN WITH AIR CONDITIONING ON.
- [SDR QMLA2024081520099](https://openairdocs.org/sdr/QMLA2024081520099.md): Unknown · fumes · Aug 13, 2024 · N292AM · Bell 407 · Air Distribution System
  > DURING CRUISE FLIGHT, NURSE SMELLED ELECTRICAL BURNING FUMES COMING FROM AIR CONDITIONER GASPER. RETURNED TO THE NEAREST SAFE LANDING AREA WHICH WAS BASE AND SHUTDOWN. MAINTENANCE WAS CONTACTED.

Next page: https://openairdocs.org/engine/allison-250-c47b/reports.md?page=2

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
WHERE engine_model_key = '250C47B'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/allison-250-c47b/reports

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