# Service difficulty reports: N733KA A list on [N733KA](https://openairdocs.org/aircraft/N733KA.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR COZA20200411130](https://openairdocs.org/sdr/COZA20200411130.md): Valve · leaking · Apr 9, 2020 · N733KA · Boeing 73786N · Fuel Transfer Valve > THE WING FUEL TANKS BECAME IMBALANCED BY 800 LBS. AFTER THE CENTER FUEL TANK WAS EMPTIED. THE FUEL CROSSFEED VALVE WAS DETERMINED TO BE LEAKING. REPLACED THE FUEL CROSSFEED VALVE WITH NO FURTHER INDICATIONS OF FUEL LEAKAGE. - [SDR COZA20181010125](https://openairdocs.org/sdr/COZA20181010125.md): Impeller · intermittent · Oct 7, 2018 · N733KA · Boeing 73786N · Fuel Boost Pump > LEFT CENTER TANK FUEL PUMP LOW PRESSURE ANNUNCIATOR CAME ON BRIEFLY WITH THE FUEL LEVEL IN THE CENTER TANK OVER HALF FULL. REPLACED THE LEFT CENTER TANK FUEL OVERRIDE PUMP MOTOR IMPELLER. OPERATIONAL CHECK NORMAL. - [SDR COZA20181008124](https://openairdocs.org/sdr/COZA20181008124.md): Bushing · missing · Oct 5, 2018 · N733KA · Boeing 7377BX · Turbine Engine Compressor Section > FLANGED BUSHINGS WERE FOUND LOOSE OR MISSING FROM THE STAGE 2 UNISON RING ON THE NR 2 ENGINE. THE STAGE 2 UNISON RING WAS REPAIRED BY REPLACING 18 EA FLANGED BUSHINGS. - [SDR COZA20180920123](https://openairdocs.org/sdr/COZA20180920123.md): Converter · intermittent · Sep 17, 2018 · N733KA · Boeing 73786N · APU Start/Ignition System > APU INTERMITTENTLY DOES NOT START ON BATTERY POWER. PERFORMED AN APU BITE CHECK FOR CURRENT FAULTS. FOUND MAINTENANCE MESSAGE 49-41248. TROUBLESHOT THE SYSTEM DOWN TO THE START CONVERTER UNIT USING THE FAULT ISOLATION MANUAL. REPLACED THE START CONVERTER AND O - [SDR COZA20171202121](https://openairdocs.org/sdr/COZA20171202121.md): Start Valve · inoperative · Nov 28, 2017 · N733KA · Boeing 73786N · Engine Start Valves/Controls > RIGHT ENGINE START VALVE WOULD NOT OPEN FAR ENOUGH TO ALLOW FOR ENGINE START. REPLACED START VALVE AND OPERATIONAL CHECK NORMAL. - [SDR COZA20170324106](https://openairdocs.org/sdr/COZA20170324106.md): Sensor · failed · Mar 22, 2017 · N733KA · Boeing 73786N · Cabin Temperature Control System > THE RIGHT PACK TEMPERATURE INDICATOR SHOWED 0 DEGREES WITH THE RIGHT PACK OPERATING NORMALLY. THE FIRST ITEM TO CHECK IN THE FIM WAS THE PACK OUTLET TEMPERATURE BULB. THE LEFT AND RIGHT PACK TEMPERATURE BULBS WERE SWAPPED. WITH THE PACKS OPERATING, THE LEFT - [SDR COZA20161223103](https://openairdocs.org/sdr/COZA20161223103.md): Wire Harness · shorted · Dec 21, 2016 · N733KA · Boeing 73786N · Fire Protection System Wiring > NR 2 ENGINE FIRE LOOP LIGHT DID NOT TEST. WHILE PERFORMING RESISTANCE CHECKS ON THE #2 ENGINE LOOP A DETECTORS NOTICED RESISTANCE CHANGES WHEN THE FIRE DETECTOR HARNESS WAS MOVED OR DISTURBED. REPLACED THE FIRE LOOP HARNESS AND #2 FIRE LOOP LIGHT TESTED OK. - [SDR COZA20161223102](https://openairdocs.org/sdr/COZA20161223102.md): Fire Detector · intermittent · Dec 20, 2016 · N733KA · Boeing 73786N · Fire Detection > #2 ENGINE FIRE LOOP LIGHT DID NOT TEST. PERFORMED A BITE CHECK ON THE ENGINE FIRE DETECTION MODULE AND FOUND ENGINE 2 LOOP A CORE RIGHT FAULT DISPLAYED. REPLACED THE #2 ENGINE LOOP A CORE FIRE DETECTOR AND FIRE LOOP LIGHT TESTED OK. - [SDR COZA20161217101](https://openairdocs.org/sdr/COZA20161217101.md): Valve · sticking · Dec 15, 2016 · N733KA · Boeing 73786N · Pneumatic Distribution System > DURING MAINTENANCE ENGINE RUNS, NOTED LEFT ENGINE BLEED PRESSURE WAS LOWER THAN THE RIGHT ENGINE AT IDLE POWER SETTINGS. THE LEFT ENGINE BLEED AIR PRESSURE WOULD RISE AND MATCH THE RIGHT PRESSURE ONCE THE POWER LEVERS WERE ADVANCED TO CHANGE THE ENGINE BLEED - [SDR COZA20161217100](https://openairdocs.org/sdr/COZA20161217100.md): Regulator · intermittent · Dec 15, 2016 · N733KA · Boeing 73786N · Pneumatic Distribution System > DURING MAINTENANCE ENGINE RUNS, NOTED LEFT ENGINE BLEED PRESSURE WAS LOWER THAN THE RIGHT ENGINE AT IDLE POWER SETTINGS. THE LEFT ENGINE BLEED AIR PRESSURE WOULD RISE AND MATCH THE RIGHT PRESSURE ONCE THE POWER LEVERS WERE ADVANCED TO CHANGE THE ENGINE BLEED - [SDR COZA20161017097](https://openairdocs.org/sdr/COZA20161017097.md): Actuator · intermittent · Oct 13, 2016 · N733KA · Boeing 73786N · Cabin Cooling System > LEFT RAM AIR DOOR ACTUATOR REPLACED AS PART OF TROUBLESHOOTING FOR A PACK LIGHT APPEARING ON RECALL. - [SDR COZA20160901094](https://openairdocs.org/sdr/COZA20160901094.md): Transmitter · intermittent · Sep 1, 2016 · N733KA · Boeing 73786N · Turbine Engine Oil System > FMC CDU ENGINE 1 BITE TEST SHOWED "OIL FILTER SIGNALS DISAGREE MESSAGE" 79-31121. FIM 79-05 TASK 817 WAS USED TO TROUBLESHOOT THE SYSTEM IN THE ORDER OF STEPS GIVEN. A VISUAL INSPECTION OF THE ELECTRICAL CONNECTORS AND RECEPTACLES OF THE OFDPS, EEC AND J7 HA - [SDR COZA20160820090](https://openairdocs.org/sdr/COZA20160820090.md): Valve · intermittent · Aug 17, 2016 · N733KA · Boeing 73786N · Cabin Temperature Control System > CONTROL CABIN AMBER ZONE TEMPERATURE ANNUNCIATOR ILLUMINATED ON RECALL. BITE CHECK OF THE ZONE/TEMPERATURE CONTROLLER INDICATED A FAILED CONTROL CABIN TRIM AIR VALVE. REPLACED THE CONTROL CABIN TRIM AIR VALVE AND OPERATIONAL CHECK NORMAL. - [SDR COZA20160815086](https://openairdocs.org/sdr/COZA20160815086.md): Sensor · faulty · Aug 15, 2016 · N733KA · Boeing 73786N · Pneumatic Distribution System > DURING GROUND ENGINE RUN NOTICED A DUCT PRESSURE SPLIT WITH RIGHT SIDE LOW. TROUBLESHOT USING FIM. REPLACED RIGHT 450 DEG THERMOSTAT SENSOR. PERFORMED ENGINE RUNS AND CONFIRMED DUCT PRESSURES MATCHED. - [SDR COZA20160815089](https://openairdocs.org/sdr/COZA20160815089.md): Sensor · intermittent · Aug 14, 2016 · N733KA · Boeing 73786N · Pneumatic Distribution System > RIGHT BLEED TRIP OFF LIGHT AT FL340 DURING AIRCRAFT CLIMBOUT. USING FIM, REPLACED THE RIGHT 390 DEG TEMPERATURE SENSOR. OPERATIONAL AND LEAK CHECK OK. - [SDR COZA20160815088](https://openairdocs.org/sdr/COZA20160815088.md): Sense Line · leaking · Aug 14, 2016 · N733KA · Boeing 73786N · Pneumatic Distribution System > RIGHT BLEED TRIP OFF LIGHT AT FL340 DURING CLIMBOUT. FOLLOWING FIM, LEAK CHECKED LINES ASSOCIATED WITH BLEED SYSTEM ON THE RIGHT SIDE. FOUND PRECOOLER VALVE SENSE LINE LEAKING AT END SWAGE. REPLACED LINE AND LEAK CHECK OK. - [SDR COZA20160815087](https://openairdocs.org/sdr/COZA20160815087.md): Shutoff Valve · intermittent · Aug 14, 2016 · N733KA · Boeing 73786N · Pneumatic Distribution System > RIGHT BLEED TRIP OFF LIGHT AT FL 340 DURING AIRCRAFT CLIMBOUT. REPLACED RIGHT PRESSURE REGULATING AND SHUTOFF VALVE. LEAK AND OPERATIONAL CHECK OK. - [SDR COZA20160815085](https://openairdocs.org/sdr/COZA20160815085.md): Actuator · faulty · Aug 11, 2016 · N733KA · Boeing 73786N · Cabin Cooling System > DURING DECENT, RIGHT PACK LIGHT ILLUMINATED. PERFORMED BITE CHECK ON RIGHT PACK/ZONE TEMPERATURE CONTROLLER AND FOUND THE RAM AIR ACTUATOR LIGHT DISPLAYED. REPLACED RIGHT RAM AIR DOOR ACTUATOR AND OPERATIONAL CHECK NORMAL. - [SDR COZA20160718084](https://openairdocs.org/sdr/COZA20160718084.md): Controller · intermittent · Jul 14, 2016 · N733KA · Boeing 73786N · Cabin Temperature Control System > LEFT AMBER "PACK" ANNUNCIATOR ILLUMINATED ON RECALL. REPLACED THE PACK ZONE TEMPERATURE CONTROLLER PER THE FIM. OPS CHECKED OK. - [SDR COZA20160718083](https://openairdocs.org/sdr/COZA20160718083.md): Accessory Unit · intermittent · Jul 14, 2016 · N733KA · Boeing 73786N · Cabin Cooling System > LEFT AMBER "PACK" ANNUNCIATOR ILLUMINATED ON RECALL. REPLACED THE AIR CONDITIONING AND ACCESSORY UNIT PER THE FIM. OPERATIONAL CHECK OK. - [SDR COZA20160718079](https://openairdocs.org/sdr/COZA20160718079.md): Actuator · faulty · Jul 12, 2016 · N733KA · Boeing 73786N · Cabin Cooling System > RIGHT AMBER "PACK" LIGHT ILLUMINATED ON RECALL DURING DECENT. BITE CHECK WAS PERFORMED ON THE RIGHT PACK/ZONE TEMPERATURE CONTROLLER. RAM AIR ACTUATOR LIGHT WAS DISPLAYED ON THE TEMPERATURE CONTROLLER. FOLLOWING THE FIM, THE RIGHT RAM AIR DOOR ACTUATOR WAS ## 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 n_number = 'N733KA' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N733KA/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.