# Service difficulty reports: Lycoming VO-540-C2A A list on [Lycoming VO-540-C2A](https://openairdocs.org/engine/lycoming-vo-540-c2a.md). Newest first. General aviation reporting is voluntary. - [SDR CA120605011](https://openairdocs.org/sdr/CA120605011.md): Crosstube · broken · May 29, 2012 · Hiller UH12E · Main Landing Gear > (CAN) FWD CROSSTUBE WAS FOUND BROKEN AT THE LT SIDE INBD BOLT HOLE UPON INSPECTION AFTER BEING TRAILERED TO A JOB SITE. - [SDR CA090220003](https://openairdocs.org/sdr/CA090220003.md): Spar · cracked · Feb 20, 2009 · Hiller UH12E · Nacelle/Pylon, Frame/Spar/Rib > (CAN) DURING INSP IAW AWD 97-10-16 (A) CONTROL ROTOR PN 36209-3, SN 449. FOUND CRACKED AT LOWER BOLT HOLE.600 FROM END OF SPAR. - [SDR 2006FA0000427](https://openairdocs.org/sdr/2006FA0000427.md): Hub · cracked · Apr 12, 2006 · N46MV · Hiller UH12E · Main Rotor Head > M/R HUB DYE CHECK INSPECTION. HUB WAS FOUND TO BE CRACKED. RETIREMENT LIFE, 2500 HOURS. (K) - [SDR AUS20030449](https://openairdocs.org/sdr/AUS20030449.md): Control Cable · failed · Apr 9, 2003 · Hiller UH12E · Tail Rotor Control System > (AUS) TAIL ROTOR CONTROL CABLE FAILED. CABLE RUNS FROM RT PEDAL TO FIREWALL LOCATED BEHIND THE PILOT SEAT. CABLE HAD BEEN SUBJECTEDTO HEAT SOURCE, POSSIBLY CONTACT WITH CIRCUIT BREAKER LOCATED IN CENTER TUNNEL WHEN TENSION WAS RELEASED DURING MAINTENANCE. PERS - [SDR AUS20020789](https://openairdocs.org/sdr/AUS20020789.md): Screw · failed · Jun 14, 2002 · Hiller UH12E · Reciprocating Engine Rear Section > (AUS) ENGINE ACCESSORY DRIVE GEAR PNO 67609 TO STARTER DRIVE GEAR PNO 67583 ATTACHMENT STUDS (6OFF) PNO STD-2208 AND DOWELS (3OFF) PNO72139 SHEARED. - [SDR AUS20010648](https://openairdocs.org/sdr/AUS20010648.md): Gear · failed · May 31, 2001 · Hiller UH12E · Reciprocating Engine Rear Section > (AUS) ENGINE DRIVE GEAR PNO 67583 HAD SHEARED ALL THE BOLTS ATTACHING IT TO ACCESSORY DRIVE PNO 67609. - [SDR AU001151](https://openairdocs.org/sdr/AU001151.md): Hub · cracked · Dec 5, 2000 · Hiller UH12E · Main Rotor Head > (AUS) MAIN ROTOR HUB SEVERELY CRACKED IN AN AREA NOT KNOWN FOR CRACKING. FOLLOWING TAKEOFF CONTROL WAS ALMOST IMPOSSIBLE AND THE MASSIVE VIBRATION CAUSED THE FORE/AFT ENGINE MOUNT TO BE TORN FROM ITS HOUSING AND THE SHAFT TO CRACK. THE CRACK WAS OPENINGUP UNDE - [SDR AU971422](https://openairdocs.org/sdr/AU971422.md): Pin · cracked · Nov 7, 1997 · Hiller UH12E · Main Rotor Head > (AUS) MAIN ROTOR HEAD TENSION/TORSION PIN CRACKED. - [SDR 97ZZZX3544](https://openairdocs.org/sdr/97ZZZX3544.md): Bearing · mismanufactured · Jul 19, 1997 · Hiller UH12E · Tail Rotor Gearbox > NEW REPLACEMENT BEARING RECEIVED WITH INSTRUCTIONS FROM MRC (BEARING MFG), AND HILLER SL UH12-25-1 DESCRIBING INSTALLATION INSTRUCTIONS WITH REGARDS TO THE FILING NOTCHES AND BEARING MARKINGS ON THE OUTER RACE. THESE INSTRUCTIONS ORIENT THE BEARING SO THE MAJ - [SDR AU970991](https://openairdocs.org/sdr/AU970991.md): Gear · damaged · Jun 14, 1997 · Hiller UH12E · Main Rotor Gearbox > (AUS) MAIN ROTOR TRANSMISSION UPPER PLANETARY RING GEAR TOOTH CHIPPED - MINOR DAMAGE TO ONE UPPER PLANETARY GEAR - [SDR CA970716002](https://openairdocs.org/sdr/CA970716002.md): Bolt · sheared · Jun 12, 1997 · Hiller UH12E · Reciprocating Engine Power Section > (CAN) ENGINE FAILED IN FLIGHT. ON DISASSEMBLY IT WAS FOUND THAT THE CAMSHAFT GEAR SCREWS HAD SHEARED EXCEPT FOR ONE THAT WAS STILL INTACT, BUT LYING IN THE OIL SUMP. THE LOCKTABS WERE STILL BENT OVER. IT APPEARS THAT EITHER A LOCKTAB BROKE LETTING A BOLT COME - [SDR AU970531](https://openairdocs.org/sdr/AU970531.md): Crankcase · cracked · May 19, 1997 · Reciprocating Engine Power Section > (AUS) ENGINE CRANKCASE CRACKED AND TUNNEL OUT OF LIMITS - CRANKSHAFT WORN BEYOND LIMITS - CAMSHAFT LOBES DAMAGED - [SDR 97ZZZX2037](https://openairdocs.org/sdr/97ZZZX2037.md): Piston Pin · defective · Apr 24, 1997 · N62392 · Hiller UH12E · Reciprocating Engine Cylinder Section > AD 97-01-03 AND LYC SB 527B DO NOT REFERENCE VO540 ENGINES IN MODELS AFFECTED, BUT 4 OF 6 PISTON PINS IN ENGINE HAD TO BE REPLACED IN C/W THE SB REQUIRED ACTION. NOTE: 6-CYLINDER HELICOPTER ENGINES ARE LISTED IN WARRANTY LABOR ALLOWANCE AND A VO540 ENGINE IS - [SDR 97ZZZX1825](https://openairdocs.org/sdr/97ZZZX1825.md): Valve · failed · Apr 7, 1997 · N36MV · Hiller UH12E · Reciprocating Engine Cylinder Section > THE HELICOPTER WAS RUNNING ROUGH SO A COMPRESSION CHECK WAS RUN. THE NR 2 CYLINDER HELD NO COMPRESSION AND WAS REMOVED FOR INSPECTION. NOTED A.1250 INCH BY.25 INCH SECTION OF THE VALVE FACE WAS MISSING. THE MISSING SECTION WAS IRREGULAR IN SHAPE AND APPEA - [SDR 97ZZZX2838](https://openairdocs.org/sdr/97ZZZX2838.md): Intake Valve · worn · Apr 7, 1997 · N36MV · Hiller UH12E · Reciprocating Engine Cylinder Section > THE VALVE STEM UNDER THE KEEPER'S WAS HEAVILY WORN. THIS CONDITION WAS ALSO FOUND ON 4 OTHER VALVES (INTAKE) ALL HAVING THE SAME TOTAL TIME AND PART NUMBER. THE 6TH VALVE WAS A LYCOMING WITH THE SAME TIME AND INSTALLATION DATE. NO PROBLEM FOUND. - [SDR AU970349](https://openairdocs.org/sdr/AU970349.md): Stud · broken · Mar 23, 1997 · Hiller UH12E · Reciprocating Engine Power Section > (AUS) NO2 CYLINDER HOLD DOWN STUDS BROKEN - INVESTIGATION FOUND SIX CYLINDER BASE NUTS MISSING, THIRTY NUTS LOOSE AND ONLY TWELVE NUTS TO BE TIGHT - CRANKCASE PARTING SURFACES AND CYLINDER MOUNT PADS FRETTED - NUMEROUS INTERNAL WRENCHING. CYLINDER BASE NUTLAND - [SDR 97ZZZX1133](https://openairdocs.org/sdr/97ZZZX1133.md): Cylinder · not to spec · Feb 25, 1997 · N36MV · Hiller UH12E · Reciprocating Engine Cylinder Section > DURING ASSEMBLY OF ENGINE, MEASURED DRY TAPPET CLEARANCE FROM.107 INCH TO.187 INCH. LYC OHM REQUIRES.028 INCH TO.080 INCH. RETURNED 6 CYLINDERS TO EC/SW WHERE THEY CUT/REMOVED MATERIAL FROM THE CYL FLANGE. CYLINDERS WERE RE-INSTALLED. THESE CYLINDERS J - [SDR AU960746](https://openairdocs.org/sdr/AU960746.md): Control Rotor · cracked · May 26, 1996 · Hiller UH12E · Main Rotor Head > (AUS) MAIN ROTOR HEAD CONTROL ROTOR CRACKED AT SPAR END THROUGH THE FIRST BOLT HOLE FOR APPROXIMATELY 50% OF CIRCUMFERENCE - FOUND DURING INSPECTION IAW AD/HIL12/17 AMDT4 - [SDR 96ZZZX2365](https://openairdocs.org/sdr/96ZZZX2365.md): Carburetor · float sticks · Apr 15, 1996 · N14634 · Hiller UH12E · Fuel Control/Reciprocating Engines > INSPECTION FOUND CARBURETOR FLOAT WAS RUBBING ON LOWER HOUSING AND STICKING OPEN. - [SDR 96ZZZX2366](https://openairdocs.org/sdr/96ZZZX2366.md): Carburetor · float sticks · Apr 15, 1996 · N14634 · Hiller UH12E · Fuel Control/Reciprocating Engines > INSPECTION FOUND CARBURETOR FLOAT WAS RUBBING ON LOWER HOUSING AND STICKING OPEN. - [SDR AU960748](https://openairdocs.org/sdr/AU960748.md): Rotor Hub · cracked · Apr 2, 1996 · Hiller UH12E · Main Rotor Head > (AUS) MAIN ROTOR HUB CRACKED IN AREA OF THREADED CUFF AND TRUNNION BOLTHOLE EXTENDING DOWN THE INNER HUB SURFACE - CRACK LENGTH APPROXIMATELY 6.35MM (0.25IN) - FOUND DURING INSPECTION IAW AD/HIL12/22A - [SDR AU960353](https://openairdocs.org/sdr/AU960353.md): Hub · cracked · Feb 25, 1996 · Hiller UH12E · Main Rotor Head > (AUS) MAIN ROTOR HUB CRACKED - FOUND DURING INSPECTION IAW AD/HIL12/22A ## 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 = 'VO540C2A' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/engine/lycoming-vo-540-c2a/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.