# Service difficulty reports: Air Tractor AT-502B A list on [Air Tractor AT-502B](https://openairdocs.org/model/air-tractor-at-502b.md). Newest first. General aviation reporting is voluntary. - [SDR 2026FA0000599](https://openairdocs.org/sdr/2026FA0000599.md): Cotter Pin · missing · Jul 7, 2026 · N647LA · Airtrc AT502B · Main Landing Gear > DURING TAKEOFF, THE PIC REPORTED A BUFFERING IN THE LEFT BRAKE JUST PRIOR TO TAKEOFF. DURING LANDING, THE PIC REPORTED A SIGNIFICANT DIFFERENCE IN BRAKING AUTHORITY BETWEEN THE RIGHT AND LEFT SIDE WHICH RESULTED IN THE AIRCRAFT DEPARTING THE RUNWAY INTO THE D - [SDR 2023FA0000586](https://openairdocs.org/sdr/2023FA0000586.md): Bearing · cracked · Oct 5, 2023 · N5197X · Airtrc AT502B · Propeller Feathering/Reversing > PROP ORIGINALLY REMOVED FOR ISSUES WITH PROP NOT FULLY CYCLING THROUGH ITS FULL RANGE OF MOTION. HAD ONE BLADE THAT WAS NOT ACTUATING PROPERLY. WAS TAKING LONGER THAN NORMAL TO GO TO FEATHER. PROP WAS DELIVERED TO NORTHWEST PROPELLER SERVICE FOR OVERHAUL. B - [SDR CA151103002](https://openairdocs.org/sdr/CA151103002.md): Bleed Valve · loose · Nov 3, 2015 · Airtrc AT502B · Compressor Bleed Valve > (CAN) DURING THE ANNUAL INSPECTION, A BORESCOPE OF THE COMPRESSOR SECTION WAS BEING CARRIED OUT. WHEN THE BLEED AIR VALVE ASSY WAS TO BE REMOVED TO PROVIDE ACCESS TO THE COMPRESSOR, IT WAS FOUND THAT THE BLEED AIR VALVE ASSY, PN 3075033-01, WAS LOOSE AND THE - [SDR CA150727018](https://openairdocs.org/sdr/CA150727018.md): Cable · loose · Jul 27, 2015 · Airtrc AT502B · Nose/Tail Landing Gear > (CAN) TAIL WHEEL LOCK CABLE FOUND OFF THE REAR PULLEY, PREVENTING THE TAIL WHEEL FROM UNLOCKING. THE PULLEY ATTACH BRACKET MOUNTED TO THE STERN POST DIAGONAL TUBE WAS FOUND ROTATED TO THE FORWARD SIDE OF THE DIAGONAL TUBE REMOVING ALL TENSION TO THE CABLE. TH - [SDR CA150525007](https://openairdocs.org/sdr/CA150525007.md): Engine · power loss · May 10, 2015 · Airtrc AT502B · Engine (Turbine/Turboprop) > (CAN) PILOT REPORTED THAT AFTER TAKEOFF WHILE THROTTLING BACK TO CRUISE SETTING, ENG EXPERIENCED A ROLL BACK TO IDLE. PILOT PROCEEDED TO LAND THE ACFT & DURING LANDING THE ACFT SLIDE SIDEWAYS WHICH BENT THE AIRFRAME BUT STAYED UP ON THE MAIN LANDING WHEELS. - [SDR CA141003011](https://openairdocs.org/sdr/CA141003011.md): Blade · cracked · Oct 2, 2014 · Airtrc AT502B · Turbine Section > (CAN) DURING HOT SECTION INSPECTION, 1 COMPRESSOR TURBINE BLADE, FOUND CRACKED AT T/E, APPROXIMATELY MID CORD, LT UNDETECTED, COULD HAVE LED TO BLADE SEPARATION AND CATASTROPHIC ENGINE FAILURE. HAVE REQUESTED REPAIR AGENCY TO SEND 2 BLADES FOR METALLURGICAL A - [SDR CA140630013](https://openairdocs.org/sdr/CA140630013.md): Unknown · unknown · Jun 13, 2014 · Airtrc AT502B · Standard Practices/Structures > (CAN) AFTER TAKEOFF FROM A DIRT STRIP, THE PILOT INITIATED AN EARLY TURN AT APPROX. 10 FT ABOVE THE GROUND. SHORTLY AFTER, THE ACFT FELT LIKE IT WAS SETTLING AND THE PILOT APPLIED FULL POWER AND NOTICED TORQUE DECREASING BEFORE THE ACFT IMPACTED THE GROUND. - [SDR CA140424002](https://openairdocs.org/sdr/CA140424002.md): Engine · power loss · Mar 31, 2014 · Airtrc AT502B · Engine (Turbine/Turboprop) > (CAN) CLIMBING THROUGH 150`, THE ENGINE LOST POWER AND THE PILOT WAS FORCED INTO A LANDING IN A FIELD WHERE A WET DENSE CROP OF COTTON WAS LOCATED. DURING LANDING THE PROPELLER STRUCK THE GROUND AND THE ACFT LOOPED RESULTING IN SUBSTANTIAL DAMAGE. - [SDR 2013FA0000405](https://openairdocs.org/sdr/2013FA0000405.md): Clevis Pin · backed out · Jul 3, 2013 · N5182C · Airtrc AT502B · Power Lever > CLEVIS PIN WAS LAYING ON FLOOR OF ACFT. HOLDS THROTTLE CABLE TO THE THROTTLE LEVER. ON TAKEOFF THE THROTTLE WAS PUT TO MAX POWER AND THE ENGINE DID NOT RESPOND. IT APPEARS THE CLEVIS PIN SHOULD HAVE HAD A WASHER AND COTTER PIN TO HOLD IT IN PLACE. THE PIN - [SDR CA130626009](https://openairdocs.org/sdr/CA130626009.md): Pressure Switch · stuck · Jun 24, 2013 · Airtrc AT502B · Aircraft Fuel Distribution System > (CAN) THE MICROSWITCH SIDE OF THE FUEL FILTER/FUEL PRESSURE WARNING SYS ASSEMBLY IS STUCK IN THE CLOSED POSITION, CAUSING A FALSE FUEL PRESSURE WARNING INDICATION. - [SDR CA130605002](https://openairdocs.org/sdr/CA130605002.md): Starter Gen · failed · Jun 3, 2013 · Airtrc AT502B · Starter-Generator > (CAN) WHILE ATTEMPTING A COMPRESSOR DESALINATION, PERFORMANCE RECOVERY WASH THE STARTER GENERATOR EMITTED A GRINDING NOISE AND FAILED UPON INITIAL SPOOL UP. - [SDR CA121213006](https://openairdocs.org/sdr/CA121213006.md): Oil Filter · failed · May 17, 2012 · Airtrc AT502B · Turbine Engine Oil System > (CAN) OIL FILTER ELEMENT WAS FOUND WITH THE INTERNAL CONE TORN, ALLOWING OIL TO BYPASS THE MAIN FILTER BODY. - [SDR CA120411006](https://openairdocs.org/sdr/CA120411006.md): Fuel Control · malfunctioned · Mar 2, 2012 · Airtrc AT502B · Fuel Control/Reciprocating Engines > (CAN) DURING THE LOADING OF CHEMICALS INTO THE ACFT FOR SPRAYING, THE PILOT HAD JUST REMOVED THE SUPPLY LINE TO THE ACFT WHEN HE HEARD THE ENGINE START TO INCREASE IN POWER. FROM THE GROUND TO THE COCKPIT CHECKED PLA AND PLA BOTH STILL BACK, PILOT SHUTDOWN TH - [SDR 2010FA0001108](https://openairdocs.org/sdr/2010FA0001108.md): Mount · cracked · Oct 14, 2010 · N61175 · Airtrc AT502B · Fuselage Main, Attach Fittings > DURING WING REMOVAL THE LT FUSELAGE TUBING WAS FOUND CRACKED AT THE TOP WING ATTACH BUSHING MOUNT. THE CRACK APPEARS TO BE ALMOST COMPLETE CRACKING FAILURE OF THE FUSELAGE VERTICAL TUBE AND GOES THROUGH THE DIAMOND PLATE GUSSET. - [SDR CA081118003](https://openairdocs.org/sdr/CA081118003.md): Lock Tab · cracked · Nov 3, 2008 · Airtrc AT502B · Power Lever > (CAN) FCU FUEL CONDITION LEVER LOCK SPRING TAB THAT IS USED TO PREVENT THE LEVER MOVING TO FUEL CUT-OFF HAS FAILED. - [SDR CA060606004](https://openairdocs.org/sdr/CA060606004.md): Line · cracked · Jun 5, 2006 · Airtrc AT502B · Landing Gear Brake System > (CAN) PILOT REPORTED RT BRAKE ALWAYS GOES SOFT WHILE TAXING. AFTER INSPECTING ENTIRE BRAKE INSTALLATION FOR LEAKS, FOUND THE FWD AND AFT BRAKE CALIPER INTERCONNECT HOSE, FWD FITTING CRACKED. THIS CRACK WAS ONLY APPARENT WHEN THE BRAKES HEAT UP AND THE CRACK O - [SDR CA050725005](https://openairdocs.org/sdr/CA050725005.md): Engine · power loss · Jul 1, 2005 · Airtrc AT502B · Engine (Turbine/Turboprop) > (CAN) THE ENGINE REPORTEDLY LOST POWER DURING TAKEOFF WITH SUBSEQUENT DAMAGE TO THE AIRCRAFT. THE ENGINE HAD BEEN CONVERTED FROM A PT6A-15AG TO A PT6A-34AG UNDER AIRFORCE TURBINE SERVICES STC SE7677SW. P&WC WILL MONITOR INVESTIGATION OF THE INCIDENT AND WILL - [SDR CA050621006](https://openairdocs.org/sdr/CA050621006.md): Engine · failed · Feb 7, 2005 · Airtrc AT502B · Engine (Turbine/Turboprop) > DURING FLIGHT, ENGINE OIL PRESSURE AND TURBINE TEMPERATURES WERE REPORTED TO RISE, FOLLOWED BY AN OIL PRESSURE REDUCTION AND FLAMES EMANATING FROM THE EXHAUST. THE PILOT SHUT THE ENGINE DOWN IN FLIGHT AND COMPLETED A DEAD-STICK LANDING. MFG WILL MONITOR THE I - [SDR CA050213006](https://openairdocs.org/sdr/CA050213006.md): Engine · failed · Feb 7, 2005 · Airtrc AT502B · Engine (Turbine/Turboprop) > (CAN) DURING FLIGHT ENGINE OIL PRESSURE AND TURBINE TEMPERATURE INCREASED. OIL PRESSURE SUBSEQUENTLY REDUCED, ACCOMPANIED BY FLAMES FROM THE ENGINE EXHAUST. THE PILOT SHUT THE ENGINE DOWN IN FLIGHT AND CARRIED OUT AN EMERGENCY LANDING. MFG WILL MONITOR INVE - [SDR 2002FA0001374](https://openairdocs.org/sdr/2002FA0001374.md): Pedestal · cracked · Dec 6, 2002 · N60518 · Airtrc AT502B · Stabilizer Control System > PEDESTAL WAS FOUND TO BE CRACKED DURING INSPECTION. - [SDR AUS20021371](https://openairdocs.org/sdr/AUS20021371.md): Plate · cracked · Nov 25, 2002 · Airtrc AT502B · Vertical Stabilizer, Attach Fittings > (AUS) VERTICAL FIN FRONT SPAR ATTACHMENT FITTING FAILED. REAR SPARCRACKED. - [SDR XR52002F00000](https://openairdocs.org/sdr/XR52002F00000.md): Indicator · shorted · Apr 12, 2002 · N91262 · Airtrc AT502B · Engine Indicating System > IN FLIGHT, PILOT REPORTED THAT CIRCUIT BREAKER (POPPED) OUT. HE RESET THE BREAKER AND SPARKS CAME OUT OF THE ITT GAUGE. THE MARK ON THE INSTRUMENT CASE INDICATE THAT A SHORT OCCURRED INSIDE AND GROUNDED TO THE INSTRUMENT PANEL, CAUSING THE SPARKS. - [SDR KZH2002F00000](https://openairdocs.org/sdr/KZH2002F00000.md): Spar Cap · cracked · Dec 10, 2001 · N6136M · Airtrc AT502B · Wing Spar > WHILE PERFORMING AN EDDY CURRENT INSPECTION OF THE.3750 DIAMETER BOLT HOLES ON THE LOWER SPAR CAP, 3 SMALL CRACKS WERE INDICATED. AD HAS BEEN ISSUED ADDRESSING THE ABOVE PROBLEM, HOWEVER IT DOES NOT ADDRESS AIRCRAFT OF THIS MODEL BELOW 4000 TT. I AM CONCERN - [SDR AU000355](https://openairdocs.org/sdr/AU000355.md): Tube · cracked · May 4, 2000 · Airtrc AT502B · Fuselage Main, Frame > (AUS) FUSELAGE VERTICAL TUBE CRACKED AT WING ANGLE ATTACHMENT POINT. - [SDR AU990925](https://openairdocs.org/sdr/AU990925.md): Bearing · failed · Aug 21, 1999 · Airtrc AT502B · Turbine Engine Accessory Drive > (AUS) NR 6 ACCESSORY DRIVE GEAR REAR BEARING BRONZE CARRIER DAMAGED. SUBMITTER SUSPECTED CAUSED BY OIL STARVATION DUE TO BLOCKED OIL GALLERY WHICH WAS CAUSED BY AN INCORRECTLY FITTED SEAL. METAL CONTAMINATION OF ENGINE OIL SYSTEM. - [SDR AU990361](https://openairdocs.org/sdr/AU990361.md): Torque Tube · cracked · Mar 22, 1999 · Airtrc AT502B · Elevator Structure > (AUS) LEFT AND RIGHT ELEVATOR TORQUE TUBES PN 30368-9 (LT) AND PN 30368-10 (RT) CRACKED. - [SDR AU990125](https://openairdocs.org/sdr/AU990125.md): Bolt · failed · Feb 11, 1999 · Airtrc AT502B · Turbine Section > (AUS) POWER TURBINE CONTAINMENT RING ATTACHMENT BOLT FAILED. THE BOLT WAS FOUND IN THE COMBUSTION LINER WITH THE LOCK WIRE ATTACHED. PART TC: 1,203. - [SDR 99ZZZX602](https://openairdocs.org/sdr/99ZZZX602.md): Line · leaking · Oct 14, 1998 · N6108L · Airtrc AT502B · Aircraft Fuel Distribution System > IN-FLIGHT LOSS OF FUEL FLOW RESULTING IN ENGINE FAILURE. EMERGENCY LANDING AT NEARBY AIRPORT. INSPECTION REVEALED CHAFED THROUGH FUEL LINE (ALUMINUM). FUEL SELECTOR TO FIREWALL. FUEL LINE CHAFED THROUGH DUE TO CONTACT WITH DEFROSTER SCAT HOSE. SUBMITTER S - [SDR AU980507](https://openairdocs.org/sdr/AU980507.md): Angle · cracked · May 7, 1998 · Airtrc AT502B · Wing, Fuselage Attach Fittings > (AUS) LT AND RT WING OUTER ATTACHMENT ANGLES CRACKED. CRACK LENGTH APPROXIMATELY 25.4 MM (1 INCH). FOUND DURING INSPECTION IAW AD/AT/16. AIRCRAFT WAS PREVIOUSLY REGISTERED IN NEW ZEALAND AS ZK-SNO. ## 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 = 'AT502B' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/air-tractor-at-502b/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.