# Service difficulty reports: Lycoming TEO-540-C1A

A list on [Lycoming TEO-540-C1A](https://openairdocs.org/engine/lycoming-teo-540-c1a.md).

Newest first. General aviation reporting is voluntary.

- [SDR HYIA20261023003](https://openairdocs.org/sdr/HYIA20261023003.md): Exhaust Pipe · cracked · Oct 22, 2026 · N929CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING UNSCHEDULED MAINTENANCE THE LT ENGINE RT EXHAUST ELBOW BROKEN AT TRANSITION CLAMP. MAINTENANCE REPLACED THE ELBOW WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20261023004](https://openairdocs.org/sdr/HYIA20261023004.md): Blade · loose · Oct 19, 2026 · N989CA · Tecnam P2012 · Propeller Blade Section
  > PILOT REPORTED ON APPROACH THE RIGHT PROPELLER LOST ~300 RPM AND VISUALLY NOTICED THE RIGHT PROPELLER LOOKED OUT OF BALANCE. MAINTENANCE INSPECTED AND FOUND ONE BLADE TO HAVE PLAY. THE PROPELLER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20261023002](https://openairdocs.org/sdr/HYIA20261023002.md): Elbow · cracked · Oct 15, 2026 · N722CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING ROUTINE INSPECTION THE LEFT ENGINE OUTBOARD EXHAUST ELBOW WAS FOUND TO BE CRACKED. MAINTENANCE REPLACED THE ELBOW WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20261006003](https://openairdocs.org/sdr/HYIA20261006003.md): Exhaust Pipe · cracked · Oct 1, 2026 · N722CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING ROUTINE INSPECTION, MAINTENANCE FOUND THE LEFT ENGINE OUTBOARD EXHAUST ELBOW WAS CRACKED. THE PART WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20261006001](https://openairdocs.org/sdr/HYIA20261006001.md): Exhaust Pipe · cracked · Sep 30, 2026 · N443CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING ROUTINE INSPECTION, MAINTENANCE FOUND THE LEFT ENGINE EXHAUST TRANSITION PIPE WAS CRACKED. THE PART WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20261006002](https://openairdocs.org/sdr/HYIA20261006002.md): Exhaust Pipe · cracked · Sep 30, 2026 · N651CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING ROUTINE INSPECTION, MAINTENANCE FOUND THE RIGHT ENGINE EXHAUST TURBO TRANSITION PIPE WAS CRACKED. THE PART WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260917001](https://openairdocs.org/sdr/HYIA20260917001.md): Exhaust Pipe · broken · Sep 15, 2026 · N989CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING TROUBLESHOOTING FOR A FUEL FILTER DISCREPANCY; MAINTENANCE FOUND RT EXHAUST ELBOW BROKEN AT TRANSITION FLANGE AND FUEL FILTER BYPASS SWITCH FAILED AS A RESULT OF EXHAUST LEAK.
- [SDR HYIA20260917002](https://openairdocs.org/sdr/HYIA20260917002.md): Cylinder · cracked · Sep 10, 2026 · N133CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > DURING NORMAL INSPECTION THE #1 CYLINDER ON THE RIGHT ENGINE WAS FOUND TO BE CRACKED. THE CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260522001](https://openairdocs.org/sdr/HYIA20260522001.md): Governor · faulted · May 14, 2026 · N989CA · Tecnam P2012 · Propeller Controlling System
  > PILOT REPORTED AN UN-COMMANDED FEATHER ON THE RIGHT ENGINE. MAINTENANCE INSPECTED RH PROP AND FOUND NO DEFECTS NOTED AT THIS TIME. REMOVED RH PROP GOVERNOR AND INSPECTED INSIDE CRANK CASE AND FOUND NO DEFECTS. NOTED THAT RH PROP GOVERNOR NOT HITTING BOTH STOPS
- [SDR HYIA20260508002](https://openairdocs.org/sdr/HYIA20260508002.md): Exhaust Pipe · cracked · May 5, 2026 · N915CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING SCHEDULED INSPECTION IT WAS NOTED THE LEFT ENGINE EXHAUST TRANSITION PIPE WAS CRACKED IN THE CENTER. THE TRANSITION PIPE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260508003](https://openairdocs.org/sdr/HYIA20260508003.md): Cylinder · oil consumption · May 5, 2026 · N915CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > DURING SCHEDULED INSPECTION IT WAS NOTED THE LEFT ENGINE #1 CYLINDER HAD AN OIL FOULED PLUG AND EXCESSIVE OIL IN THE CYLINDER. THE #1 CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260430001](https://openairdocs.org/sdr/HYIA20260430001.md): Cylinder · failed insp · Apr 27, 2026 · N411CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > CREW REPORTED THE RIGHT ENGINE HAD AN OIL LEAK. MAINTENANCE INSPECTED THE ENGINE, BORESCOPED THE CYLINDERS AND FOUND THE #5 CYLINDER TO HAVE EXCESSIVE OIL POOLING AND PITTING ON THE EXHAUST VALVE. THE CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260430004](https://openairdocs.org/sdr/HYIA20260430004.md): Exhaust Pipe · broken · Apr 23, 2026 · N411CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING AN ENGINE CHANGE, THE LEFT EXHAUST PIPE WAS FOUND TO BE CRACKED. THE PIPE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260508005](https://openairdocs.org/sdr/HYIA20260508005.md): Exhaust Pipe · cracked · Apr 16, 2026 · N255CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING SCHEDULED INSPECTION MAINTENANCE FOUND THE LEFT ENGINE TURBO TRANSITION PIPE CRACKED. THE TRANSITION PIPE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260424003](https://openairdocs.org/sdr/HYIA20260424003.md): Stud · broken · Apr 12, 2026 · N411CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED DURING CRUISE, THE LEFT ENGINE ONLY PRODUCING 59% POWER AT 2100 RPM. MAINTENANCE INSPECTED AND FOUND THE LEFT ENGINE #6 CYLINDER TO HAVE TWO BROKEN CYLINDER STUDS. THE ENGINE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260424002](https://openairdocs.org/sdr/HYIA20260424002.md): Belt · failed · Apr 11, 2026 · N288CA · Tecnam P2012 · DC Generating System
  > PILOT REPORTED LEFT AND RIGHT ALTERNATOR FAILURES IN FLIGHT. MAINTENANCE INSPECTED AND FOUND FOUND BOTH ALTERNATOR BELTS TO HAVE FAILED. LEFT AND RIGHT ALTERNATOR BELTS WERE REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260410001](https://openairdocs.org/sdr/HYIA20260410001.md): Exhaust Pipe · broken · Apr 8, 2026 · N411CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > PILOT REPORTED LEFT ENGINE NOT PRODUCING FULL POWER AT 2500 FT, 28" MP AND 2515 RPM. MAINTENANCE INSPECTED AND FOUND THE LEFT REAR EXHAUST PIPE FLANGE BROKEN LEADING TO TRANSITION BLOCK. THE PART WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260410002](https://openairdocs.org/sdr/HYIA20260410002.md): Cylinder · low pressure · Apr 6, 2026 · N255CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED EXCESSIVE ENGINE VIBRATION DURING TAKE OFF AND CRUISE. MAINTENANCE INSPECTED AND FOUND THE #6 CYLINDER DEAD, THE CYLINDER WAS REPLACED ALONG WITH CYLINDER #5'S SPARK PLUGS WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260508004](https://openairdocs.org/sdr/HYIA20260508004.md): Exhaust Pipe · cracked · Apr 6, 2026 · N722CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING SCHEDULED INSPECTION MAINTENANCE FOUND THE LEFT ENGINE EXHAUST TRANSITION PIPE IS CRACKED. THE TRANSITION PIPE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260430003](https://openairdocs.org/sdr/HYIA20260430003.md): Wye Pipe · cracked · Mar 24, 2026 · N411CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING SCHEDULED INSPECTION MAINTENANCE FOUND THE LEFT ENGINE EXHAUST TRANSITION PIPE CRACKED. THE TRANSITION WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260327009](https://openairdocs.org/sdr/HYIA20260327009.md): Sensor · defective · Mar 20, 2026 · N843CA · Tecnam P2012 · Fuel Pressure Sensor
  > PILOT REPORTED ON CLIMB RIGHT ENGINE SURGING FOLLOWED BY RED LOW FUEL PRESSURE CAS MESSAGE WITH UNCONTROLLABLE YAW, THE PILOT FEATHERED THE PROP AND RETURNED TO LAND. MAINTENANCE INSPECTED AND FOUND THE FUEL PRESSURE SENSOR CAUSING THE ISSUE. THE SENSOR WAS RE
- [SDR HYIA20260327008](https://openairdocs.org/sdr/HYIA20260327008.md): Crankcase · cracked · Feb 27, 2026 · N843CA · Tecnam P2012 · Reciprocating Engine Power Section
  > DURING INSPECTION, WHILE TROUBLESHOOTING AN OIL LEAK, A CRACK FOUND IN THE ENGINE CRANK CASE. THE ENGINE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260327007](https://openairdocs.org/sdr/HYIA20260327007.md): Exhaust Valve · failed · Feb 26, 2026 · N288CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED RIGHT ENGINE HIGH EGT DURING CRUISE FLIGHT. MAINTENANCE INSPECTED AND FOUND THE NR 4 EXHAUST VALVE CHIPPED NEAR VALVE SEAT. THE CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260327006](https://openairdocs.org/sdr/HYIA20260327006.md): Cylinder · scored · Feb 17, 2026 · N357CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > DURING INSPECTION IT WAS FOUND THE NR 3 CYLINDER ON THE LEFT ENGINE HAD SCORING ON THE CYLINDER WALLS CAUSED BY A BROKEN OIL CONTROL RING. THE CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260327005](https://openairdocs.org/sdr/HYIA20260327005.md): Intake Valve · failed · Feb 9, 2026 · N244CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED THE RIGHT ENGINE CHT & EGT DROPPED RAPIDLY, ALONG WITH FUEL PRESSURE, AS WELL AS AIRCRAFT YAW AND ENGINE ROUGHNESS. MAINTENANCE INSPECTED AND FOUND THE RIGHT ENGINE #3 CYLINDER INTAKE VALVE FAILED, AND THE VALVE STEM BECAME LODGED IN THE CYLINDE
- [SDR HYIA20260206001](https://openairdocs.org/sdr/HYIA20260206001.md): Exhaust Pipe · broken · Feb 5, 2026 · N133CA · Tecnam P2012 · Engine Collector/Tailpipe/Nozzle
  > DURING INVESTIGATION OF PILOT REPORT FOR SMOKE IN THE COCKPIT IT WAS DISCOVERED THE LEFT ENGINE RIGHT EXHAUST PIPE HAD BROKEN, WHICH CAUSED DAMAGE TO A TKS LINE AND AN ALTERNATE AIR CONTROL CABLE IN THE VICINITY. THE EXHAUST PIPE WAS REPLACED WITH NO FURTHER D
- [SDR HYIA20260327004](https://openairdocs.org/sdr/HYIA20260327004.md): Engine · making metal · Jan 14, 2026 · N135CA · Tecnam P2012 · Engine (Reciprocating)
  > PILOT REPORTED LEFT ENGINE LOW OIL PRESSURE, WHICH DROPPED INTO THE RED DURING LANDING. MAINTENANCE INSPECTED AND FOUND METAL CONTAMINATION IN THE LEFT ENGINE AND OIL POOLING IN 5 OUR OF 6 CYLINDERS. THE ENGINE WAS REPLACED WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20260327003](https://openairdocs.org/sdr/HYIA20260327003.md): Case · cracked · Nov 5, 2025 · N508CA · Tecnam P2012 · Reciprocating Engine Power Section
  > DURING TROUBLESHOOTING FOR AN OIL LEAK DURING SCHEDULED INSPECTION, A CRACK IN THE ENGINE CASE WAS FOUND IN THE AREA OF THE #1-CYLINDER BOTTOM MOUNT. THIS ENGINE WAS REPLACED WITH NO FURTHER ISSUES.
- [SDR HYIA20260327002](https://openairdocs.org/sdr/HYIA20260327002.md): Nut · broken · Oct 26, 2025 · N699CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > DURING TROUBLESHOOTING FOR A HIGH OIL CONSUMPTION CONCERN, IT WAS DISCOVERED THE RH ENG #2 CYLINDER BASE NUTS 1/2 IN. #3 AND 3/8 # 2,3,4 BROKEN AND MISSING FROM THROUGH STUDS. THE ENGINE WAS REPLACED WITH NO FURTHER ISSUES NOTED.
- [SDR HYIA20250326001](https://openairdocs.org/sdr/HYIA20250326001.md): Engine · shutdown · Mar 17, 2025 · N443CA · Tecnam P2012 · Engine (Turbine/Turboprop)
  > APPROXIMATELY 30 MINUTES INTO THE FLIGHT, THE LT ENGINE DROPPED TO 15" MAP AND THEN RETURNED TO 36" MAP ~3 TIMES. AFTER ~10 MORE SECONDS THE LT ENGINE MAP DROPPED TO 0" AND THE POWER PERCENTAGE INDICATED 0 FOR ~20 SECONDS. THE LT ENGINE WAS SECURED AND THE AIR
- [SDR HYIA20250106001](https://openairdocs.org/sdr/HYIA20250106001.md): Fire Detector · failed · Jan 1, 2025 · N945CA · Tecnam P2012 · Fire Detection
  > PILOT REPORTED ON APPROACH THE LEFT FIRE CAS MESSAGE APPEARED, THERE WERE NO OTHER FIRE INDICATIONS AND UPON LANDING THE MESSAGE EXTINGUISHED. MAINTENANCE INSPECTED AND SUSPECTED DAMAGE AT THE FIRE DETECTOR POSITION 1, REPLACED THE FIRE DETECTOR WITH NO OTHER
- [SDR HYIA20240711003](https://openairdocs.org/sdr/HYIA20240711003.md): Engine · overspeed · Jul 2, 2024 · N411CA · Tecnam P2012 · Engine (Reciprocating)
  > THROUGH REVIEW OF ENGINE PERFORMANCE DATA IT WAS DISCOVERED THE RIGHT ENGINE WAS OVER SPED BY MORE THAN 10% DURING FLIGHT TRAINING DOING BACK-TO-BACK PRACTICES OF SIMULATED ENGINE OUT OPERATIONS. PER MANUFACTURE'S GUIDANCE THE ENGINE WILL BE REPLACED.
- [SDR HYIA20240524001](https://openairdocs.org/sdr/HYIA20240524001.md): Belt · loose · May 19, 2024 · N357CA · Tecnam P2012 · DC Generating System
  > PILOT REPORTED RIGHT ALTERNATOR CIRCUIT BREAKER POPPED WHICH RESULTED IN COMPLETE ELECTRICAL FAILURE, EMERGENCY BATTER WAS USED AND THE AIRCRAFT DIVERTED AND LANDED SAFELY. MAINTENANCE INSPECTED AND FOUND THE LEFT ALTERNATOR BELT WAS LOOSE. TIGHTENED THE BELT
- [SDR HYIA20240319001](https://openairdocs.org/sdr/HYIA20240319001.md): Cylinder · failed · Mar 14, 2024 · N915CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED ROUGH ENGINE AND SMOKE COMING FROM THE EXHAUST. MAINTENANCE INSPECTED AND FOUND CYLINDER #3 EXHAUST ROCKER ARM PIN RETAINING COVER HAD FALLEN OFF AND PIN HAD MIGRATED OUT, CAUSING ROCKER ARM TO BECOME DISLODGED AND PUSH ROD TO CONTACT ROCKER COV
- [SDR HYIA20230928002](https://openairdocs.org/sdr/HYIA20230928002.md): Stud · sheared · Sep 27, 2023 · N357CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > DURING ROUTINE INSPECTION THE NUMBER ONE CYLINDER THROUGH STUD WAS FOUND TO BE SHEARED. THE ENGINE IS BEING REPLACED.
- [SDR HYIA20230928001](https://openairdocs.org/sdr/HYIA20230928001.md): Stud · sheared · Sep 19, 2023 · N989CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > DURING ROUTINE INSPECTION THE NUMBER ONE CYLINDER THROUGH STUD WAS FOUND TO BE SHEARED. THE ENGINE IS BEING REPLACED.
- [SDR HYIA20230912005](https://openairdocs.org/sdr/HYIA20230912005.md): Cylinder · failed · Sep 7, 2023 · N945CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED BLACK AND GREY SMOKE FROM RIGHT ENGINE EXHAUST. MAINTENANCE INSPECTED AND FOUND THE RIGHT ENGINE #5 CYLINDER OIL SOAKED. CYLINDER WAS REPLACED.
- [SDR HYIA20230912004](https://openairdocs.org/sdr/HYIA20230912004.md): Cylinder · failed · Sep 6, 2023 · N411CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED LEFT OIL PRESSURE DROPPED IN FLIGHT WITH BLACK SMOKE. MAINTENANCE INSPECTED AND FOUND EXCESSIVE OIL IN THE LEFT ENGINE #4 CYLINDER. REPLACED CYLINDER WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20230912003](https://openairdocs.org/sdr/HYIA20230912003.md): Unknown · unknown · Sep 3, 2023 · N345CA · Tecnam P2012 · Reciprocating Engine Cylinder Section
  > PILOT REPORTED RIGHT ENGINE OIL PRESSURE OSCILLATING FROM 72-38 PSI IN FLIGHT. MAINTENANCE INSPECTED AND FOUND ALL CYLINDER BORES COATED WITH OIL AND CYLINDER WALLS SCORED. ALL CYLINDERS ARE BEING REPLACED.
- [SDR HYIA20230512001](https://openairdocs.org/sdr/HYIA20230512001.md): Sensor · failed · May 9, 2023 · N995CA · Tecnam P2012 · Turbine Engine Bypass Section
  > PILOT REPORTED LEFT ENGINE LOST FUEL PRESSURE WHEN CLIMBING THROUGH 7000 FEET. CREW NOTICED IT WAS WHEN THE LEFT FUEL PUMP WOULD CYCLE ON AUTOMATICALLY AND THE FUEL PRESSURE WENT INTO RED ARC ACCOMPANIED BY A 'LOW FUEL PRESSURE CAS MESSAGE'. MAINTENANCE INSPEC
- [SDR HYIA20230511001](https://openairdocs.org/sdr/HYIA20230511001.md): Solenoid Valve · failed · May 5, 2023 · N843CA · Tecnam P2012 · Turbine Engine Combustion Section
  > LEFT PRIMARY AND SECONDARY NTO LIGHT ILLUMINATED WITH 40% POWER REDUCTION. MAINTENANCE INSPECTED AND FOUND A WASTEGATE DRIVER OUTPUT FAILURE. MAINTENANCE REPLACED THE LEFT ENGINE WASTEGATE SOLENOID WITH NO FURTHER DEFECTS NOTED.
- [SDR HYIA20230511002](https://openairdocs.org/sdr/HYIA20230511002.md): Unknown · unknown · May 4, 2023 · N722CA · Tecnam P2012 · Turbine Engine Combustion Section
  > PILOT REPORTED LEFT ENGINE EGT, CHT & TIT ABNORMALLY LOW DURING FINE, AND HEAVY BLACK SMOKE FROM LEFT ENGINE DURING FINAL. CREW ALSO NOTED OIL LEAK ON LEFT ENGINE AFTER LANDING. MAINTENANCE INSPECTED AND FOUND THE INTAKE VALVE ON THE LEFT ENGINE NUMBER 3 CYLIN

## 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 = 'TEO540C1A'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/lycoming-teo-540-c1a/reports

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