# Service difficulty reports: Lycoming TVO-435-B1A A list on [Lycoming TVO-435-B1A](https://openairdocs.org/engine/lycoming-tvo-435-b1a.md). Newest first. General aviation reporting is voluntary. - [SDR AU510001577](https://openairdocs.org/sdr/AU510001577.md): Shaft · wrong part · Aug 6, 2005 · Bell 47G3B1 · Tail Rotor Gearbox > TAIL ROTOR GEARBOX PINION SHAFT WORN AND INCORRECT PART. BELL 47 SI 428 CALLED FOR REPLACEMENT OF P/N 47-645-205-1 WITH P/N 47-645-205-3 SHAFT. - [SDR 2005FA0001075](https://openairdocs.org/sdr/2005FA0001075.md): Bushing · worn · Jul 29, 2005 · N715BH · Bell 47G5A · Reciprocating Engine Power Section > MAGNETO IDLER GEAR SHAFT BROKE, THE BREAK WAS CAUSED BY A WORN BUSHING ON THE GEAR/SHAFT P/N'S 76091 & 76283 THAT DRIVES IT. THIS IS THE SECOND TIME THIS SHAFT BROKE. TOTAL TIME SINCE OVERHAUL 230 HOURS. - [SDR AUS20040411](https://openairdocs.org/sdr/AUS20040411.md): Bracket · missing · Apr 5, 2004 · Bell 47G3B1 · Tail Rotor Control System > (AUS) DUAL TAIL ROTOR CONTROL PEDAL SYSTEM INTERFERENCE BRACKET NOT FITTED. AD/BELL47/69 REQUIRES THE BRACKET TO BE FITTED TO DUALCONTROL BELL/AGUSTA 47 SERIES AIRCRAFT. THE BRACKET PREVENTS INCORRECT FITMENT OF THE DUAL PEDAL CONTROLS. PERSONNEL/MAINTENANCE E - [SDR AUS20020628](https://openairdocs.org/sdr/AUS20020628.md): Stud · failed · Apr 21, 2002 · Bell 47G3B · Rotorcraft Cooling Fan System > (AUS) COOLING FAN MOUNT STUD LOCATED ON CRANKCASE FAILED. LOSS OF TENSION ALLOWED BELT TO FALL OFF AND DESTROY THE COOLING FAN. - [SDR AUS20020344](https://openairdocs.org/sdr/AUS20020344.md): Hub · cracked · Apr 11, 2002 · Bell 47G3B1 · Main Rotor Head > (AUS) MAIN ROTOR HUB CRACKED IN AREA OF BEARING SPINDLE RADIUS. FOUND DURING INSPECTION IAW AD/BELL47/72 A2. - [SDR 20010319CW006](https://openairdocs.org/sdr/20010319CW006.md): Clutch · damaged · Feb 16, 2001 · N48020 · Bell 47G3B1 · Engine/Transmission Coupling > AIRCRAFT IN CRUISE AT 300 FT AGL CLUTCH SLIPPED AUTOROTATION PERFORMED DISASSEMBLED FOUND PARTIAL CONTACT OF CLUTCH/DRUM FACE. DRUM AT MAX LIMITS. MORE CAUTIOUS MEASUREMENT DURING OVERHAUL AND REQUIRED INSPECTION. - [SDR AU981526](https://openairdocs.org/sdr/AU981526.md): Hook · malfunctioned · Oct 26, 1998 · Bell 47G3B1 · Cargo Compartments > (AUS) CARGO HOOK ELECTRIC RELEASE INTERMITTENT IN OPERATION. DURING AN EMERGENCY LOAD RELEASE THE HOOK DID NOT OPEN AND THE AIRCRAFT CRASHED INTO THE GROUND. AIRCRAFT WAS OPERATING IN A SWAMP AND IT IS SUSPECTED THAT WATER OR FOREIGN MATERIAL CAUSED THE HOOK - [SDR AU981510](https://openairdocs.org/sdr/AU981510.md): Spring · broken · Sep 30, 1998 · Bell 47G3B · Reciprocating Engine Cylinder Section > (AUS) NR 1 CYLINDER INLET VALVE OUTER VALVE SPRING BROKEN. - [SDR AU980929](https://openairdocs.org/sdr/AU980929.md): Driveshaft · misaligned · Jul 2, 1998 · Bell 47G3B · Tail Rotor Drive Shaft > (AUS) TAIL ROTOR DRIVE SHAFT AND BEARINGS OUT OF ALIGNMENT. GREASE DISCOLOURED AT NR 1, NR 2, NR 7, AND NR 8 BEARINGS. ALL BEARINGS SHOWED SIGNS OF HEAVY WEAR. - [SDR AU971467](https://openairdocs.org/sdr/AU971467.md): Valve Seat · separated · Nov 18, 1997 · Bell 47J2A · Reciprocating Engine Cylinder Section > (AUS) NO4 CYLINDER EXHAUST VALVE SEAT SEPARATED FROM CYLINDER. NO2 CYLINDER EXHAUST VALVE AND VALVE GUIDE UNSERVICEABLE. NO2 CYLINDER HEAD EXTENSIVELY CRACKED. - [SDR AU971354](https://openairdocs.org/sdr/AU971354.md): Blade · separated · Oct 23, 1997 · Bell 47G3B1 · Tail Rotor Blades > (AUS) TAIL ROTOR BLADE TIP WEIGHT SEPARATED. - [SDR AU970582](https://openairdocs.org/sdr/AU970582.md): Data Plate · faulty · May 16, 1997 · Bell 47G3B1 · Placards and Markings > (AUS) LARGE NUMBERS OF DISCREPANCIES WERE FOUND IN RELATION TO SERIAL NUMBERS - DATA PLATE FITTED DOES NOT MATCH CASA RECORDS - SUSPECT MAJOR REBUILD CARRIED OUT FOLLOWING ACCIDENT IN 1988 -PERSONNEL/MAINTENANCE ERROR - [SDR AU970586](https://openairdocs.org/sdr/AU970586.md): Radio System · unapproved · May 16, 1997 · Bell 47G3B1 · Communications System > (AUS) RADIOS FITTED WITHOUT CERTIFICATION - PERSONNEL/MAINTENANCE ERROR - UNAPPROVED PART - [SDR AU970587](https://openairdocs.org/sdr/AU970587.md): Lights · missing · May 16, 1997 · Bell 47G3B1 · Exterior Lighting > (AUS) NO LANDING LIGHTS FITTED - PERSONNEL/MAINTENANCE ERROR - [SDR AU970588](https://openairdocs.org/sdr/AU970588.md): Tube · damaged · May 16, 1997 · Bell 47G3B1 · Fuselage Main, Structure > (AUS) TWO STRUCTURAL TUBES DAMAGED - PERSONNEL/MAINTENANCE ERROR - [SDR AU970589](https://openairdocs.org/sdr/AU970589.md): Elt · wrong part · May 16, 1997 · Bell 47G3B1 · Emergency Locator Beacon > (AUS) INCORRECT ELT FITTED - PERSONNEL/MAINTENANCE ERROR - UNAPPROVED PART. - [SDR AU970590](https://openairdocs.org/sdr/AU970590.md): Controller · seized · May 16, 1997 · Bell 47G3B1 · Engine Air Intake System > (AUS) CARBURETTOR HEAT CONTROL SEIZED - PERSONNEL/MAINTENANCE ERROR - [SDR AU970591](https://openairdocs.org/sdr/AU970591.md): Extinguisher · faulty · May 16, 1997 · Bell 47G3B1 · Fire Bottle, Portable > (AUS) FITMENT OF FIRE EXTINGUISHER NOT ENTERED IN LOG BOOKS - [SDR AU970592](https://openairdocs.org/sdr/AU970592.md): Fuel Shutoff · disconnected · May 16, 1997 · Bell 47G3B1 · Fuel Selector/Shut-Off Valve > (AUS) FUEL CUTOFF DISCONNECTED - [SDR AU970593](https://openairdocs.org/sdr/AU970593.md): Toolbox · unapproved · May 16, 1997 · Bell 47G3B1 · Rotorcraft Tail Boom > (AUS) TOOLBOX MOUNTED IN TAIL BOOM - PERSONNEL/MAINTENANCE ERROR -UNAPPROVED PART - [SDR AU970594](https://openairdocs.org/sdr/AU970594.md): Tachometer · wrong part · May 16, 1997 · Bell 47G3B1 · Engine RPM Indicating System > (AUS) INCORRECT TACHOMETER FITTED - PERSONNEL/MAINTENANCE ERROR - UNAPPROVED PART - [SDR AU970595](https://openairdocs.org/sdr/AU970595.md): Cabin · faulty · May 16, 1997 · Bell 47G3B1 · Flight Compartment Equipment > (AUS) SUSPECT CABIN RENEWED WITH NO LOG BOOK ENTRY -PERSONNEL/MAINTENANCE ERROR - [SDR AU970596](https://openairdocs.org/sdr/AU970596.md): Inertia Reel · faulty · May 16, 1997 · Bell 47G3B1 · Flight Compartment Equipment > (AUS) SEAT BELT INERTIA REEL FAULTY - PERSONNEL/MAINTENANCE ERROR - [SDR AU970597](https://openairdocs.org/sdr/AU970597.md): Indicator · faulty · May 16, 1997 · Bell 47G3B1 · Fuel Quantity Indicator > (AUS) FUEL GAUGES FAULTY - PERSONNEL/MAINTENANCE ERROR ## 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 = 'TVO435B1A' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/engine/lycoming-tvo-435-b1a/reports --- 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.