# Service difficulty reports: Air Tractor AT-401 A list on [Air Tractor AT-401](https://openairdocs.org/model/air-tractor-at-401.md). Newest first. General aviation reporting is voluntary. - [SDR RZIG2014092400553](https://openairdocs.org/sdr/RZIG2014092400553.md): Cylinder · fractured · Aug 24, 2014 · N91968 · Airtrc AT401 · Reciprocating Engine Cylinder Section > AFTER TAKEOFF NR 2 CYLINDER EXHAUST VALVE STUCK IN OPEN POSITION LETTING PISTON CONTACT VALVE, BREAKING EXHAUST ROCKER HOUSING FROM CYLINDER. ACFT LOST POWER FORCING LANDING. ACFT CAUGHT FIRE. - [SDR CA140107008](https://openairdocs.org/sdr/CA140107008.md): Bearing · worn · Jan 7, 2014 · Airtrc AT401 · Reciprocating Engine Cylinder Section > (CAN) WHILE CARRYING OUT VALVE CLEARANCE INSPECTION, THE EXHAUST VALVE ROCKER ARM ON THE NR 7 CYLINDER WAS FOUND WITH EXCESSIVE PLAY BOTH RADIALLY AND AXIALLY. UPON REMOVAL BEARING BALLS FELL OUT OF THE BEARING CAGE. - [SDR 2013FA0000205](https://openairdocs.org/sdr/2013FA0000205.md): Blades · broken · Apr 1, 2013 · Airtrc AT401 · Turbine Section > REPORTED THAT AFTER LANDING, PROPELLER SLOWED DOWN QUICKER THAN NORMAL. DURING SHUTDOWN THE PROPELLER DID NOT FEATHER AND CAME TO LOW SPEED STOP. INSPECTION OF THE ENGINES REVEALED GGT ROTOR BLADE SEPARATION. SUBJECT ENGINE WAS REMOVED FROM SERVICE AND SEN - [SDR CA120828003](https://openairdocs.org/sdr/CA120828003.md): Turbocharger · seized · Aug 27, 2012 · Airtrc AT401 · Exhaust Turbocharger > (CAN) PILOT REPORTED LOSS OF MAINIFOLD PRESSURE ON TAKEOFF MAINTENANCE FOUND THE TURBO CHARGER SEIZED. - [SDR CA120816002](https://openairdocs.org/sdr/CA120816002.md): Cylinder · failed · Aug 12, 2012 · Airtrc AT401 · Reciprocating Engine Cylinder Section > (CAN) INFLIGHT ENGINE FAILURE DUE INTERNAL CAM SHAFT/VALVE TRAIN FAILURE. - [SDR CA130306008](https://openairdocs.org/sdr/CA130306008.md): Blade · damaged · Jun 6, 2012 · Airtrc AT401 · Turbine Section > (CAN) PILOT REDUCED POWER TO IDLE AT TOUCHDOWN, HE NOTED PROP RPM DECAY BELOW NORMAL. ENGINE LOW OIL PRESSURE LIGHT ILLUMINATED, PROP THEN STOPPED TURNING BUT DID NOT FEATHER. PILOT CARRIED OUT SHUTDOWN PROCEDURE. ACFT WAS TOWED FROM RUNWAY. INITIAL INSPEC - [SDR CA120601005](https://openairdocs.org/sdr/CA120601005.md): Pump · failed · May 30, 2012 · Airtrc AT401 · Engine Fuel Pump > (CAN) FUEL PUMP WAS FAILED OUT OF THE BOX. THE PUMP CREATED ZERO FUEL PRESSURE. - [SDR 2011FA0000637](https://openairdocs.org/sdr/2011FA0000637.md): Exhaust Valve · stuck · Jul 29, 2011 · N45332 · Airtrc AT401 · Reciprocating Engine Cylinder Section > ACFT DEVELOPED HEAVY VIBRATION DUE TO A STUCK EXHAUST VALVE IN THE CYLINDER ASSY. - [SDR 2010FA0000713](https://openairdocs.org/sdr/2010FA0000713.md): Angle · cracked · Jun 17, 2010 · N10063 · Airtrc AT401 · Fuselage Miscellaneous Structure > THE CRACK DEVELOPED FROM THE TOP DOWN IN THE CORNER OF THE ANGLE FOR APPROX 1 INCH. IT HAS FLOWN FOR 91 HRS SINCE THE LAST INSP AT WHICH TIME NO CRACK WAS APPARENT. THE ACFT FLIES OUT OF A SMOOTH PAVED RUNWAY AND IS USED MOSTLY FRO GRANULAR FERTILIZER APPLIC - [SDR SWP2009F00000](https://openairdocs.org/sdr/SWP2009F00000.md): Connecting Rod · broken · Jun 19, 2009 · N1548L · Airtrc AT401 · Reciprocating Engine Power Section > ON JUNE 12, 2009 NR 3 CONNECTING ROD BROKE CAUSING NR 3 CYL TO SEPARATE COMPLETELY FROM ENGINE. ACFT LANDED IN AN ALFALFA FIELD. ACFT DID NOT SUSTAIN ANY DAMAGE. (K) - [SDR CA071016016](https://openairdocs.org/sdr/CA071016016.md): Engine · power loss · Aug 20, 2007 · Airtrc AT401 · Engine (Turbine/Turboprop) > (CAN) DURING SPRAYING OPERATIONS THE ENGINE EMITTED A LOUD NOISE AND LOST POWER, RESULTING IN A FORCED LANDING. - [SDR CA030404007](https://openairdocs.org/sdr/CA030404007.md): Strap · broken · Mar 25, 2003 · Airtrc AT401 · Fuselage Miscellaneous Structure > (CAN) UPON PERFORMING THE SCHEDULED 200 HOUR INSTALLATION INSPECTION, THE HOSE STRAP WAS FOUND TO BE BROKEN NEAR THE MOUNTING BOLT HOLE. THE BROKEN HOSE STRAP WAS REPLACED. INVESTIGATION INTO THE CAUSE, AND FORMULATION OF CORRECTIVE ACTION CONTINUES. MORE DETA - [SDR CA030404006](https://openairdocs.org/sdr/CA030404006.md): Harness · damaged · Mar 25, 2003 · Airtrc AT401 · Ignition Harness (Distribution) > (CAN) UPON PERFORMING THE SCHEDULED 200 HOUR ENGINE INSPECTION, THE IGNITION HARNESS ASSEMBLY WAS FOUND TOBE DAMAGED DUE TO EXCESSIVE HEAT. THE DAMAGE WAS LOCATED AT THE B5 SPARK PLUG LEAD. DIRECT EXPOSURE TO EXHAUST GASES WAS RULED OUT AS THE CAUSE OF THE DAM - [SDR 2002FA0001376](https://openairdocs.org/sdr/2002FA0001376.md): Nut · cracked · Dec 6, 2002 · N1008Q · Airtrc AT401 · Propeller Hub Section > A NEWLY OVERHAULED "0" TIME PROPELLER WAS INSTALLED 05/31/01. DURING MAINTENANCE JULY 5, 2002 THE PROPELLER HAD TO BE REMOVED TO FACILITATE OTHER WORK. DURING THE REMOVAL IT WAS DISCOVERED THAT THE PROPELLER RETAINING NUT WAS CRACKED THE FULL HEIGHT OF THE N - [SDR 2002FA0001375](https://openairdocs.org/sdr/2002FA0001375.md): Nut · cracked · Dec 6, 2002 · N1008Q · Airtrc AT401 · Propeller Hub Section > A NEWLY OVERHAULED "0" TIME PROPELLER WAS INSTALLED 05/31/01. DURING MAINTENANCE JULY 5, 2002 THE PROPELLER HAD TO BE REMOVED TO FACILITATE OTHER WORK. DURING THE REMOVAL IT WAS DISCOVERED THAT THE PROPELLER RETAINING NUT WAS CRACKED THE FULL HEIGHT OF THE N - [SDR CA001218020](https://openairdocs.org/sdr/CA001218020.md): Attach Angle · cracked · Oct 15, 2000 · Airtrc AT401 · Wing, Fuselage Attach Fittings > (CAN) CRACKS FOUND IN 90 DEGREES RADIUS OF UPPER ATTACH ANGLES. LOWER ATTACH ANGLES CRACKS FOUND ON FUSELAGE ATTACH POINT. - [SDR 20000809SH002](https://openairdocs.org/sdr/20000809SH002.md): Rod · fractured · Jul 13, 2000 · N4508Y · Airtrc AT401 · Reciprocating Engine Power Section > DURING AGRICULTURAL SPRAYING OPERATION, NR 7 ROD ASSY FAILED FORCING AIRCRAFT TO EMERGENCY LANDING AND SUBSEQUENT SUBSTANTIAL AIRCRAFT DAMAGE. REF: ACCIDENT REPORT NR LAX00LA271. (X) - [SDR 20000613SH003](https://openairdocs.org/sdr/20000613SH003.md): Attach Fitting · corroded · May 15, 2000 · N4545W · Airtrc AT401 · Horizontal Stabilizer Structure > INTERNAL CORROSION CAUSED FAILURE OF HORIZONTAL STABILIZER STRUT AT LOWER ATTACH FITTING. SUBMITTER RECOMMENDED LOWER ATTACH POINT DESIGNED SIMILAR TO UPPER FITTING AND LINSEED OIL APPLIED TO INSIDE OF STRUT. (X) - [SDR AU960373](https://openairdocs.org/sdr/AU960373.md): Angle · cracked · Mar 12, 1996 · Airtrc AT401 · Fuselage, Wing Attach Fittings > (AUS) WING ATTACHMENT ANGLES (2OFF) CRACKED ON INSIDE FACE AND CORRODED AROUND MOUNT HOLES AND LOWER HOLES ## 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 aircraft_model_key = 'AT401' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/air-tractor-at-401/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.