N733KA
Registered owner: BANK OF UTAH TRUSTEE, UT (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
No operator established for this aircraft.
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
Maintenance disclosures
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.
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.
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.
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 OPERATIONAL CHECK NORMAL.
RIGHT ENGINE START VALVE WOULD NOT OPEN FAR ENOUGH TO ALLOW FOR ENGINE START. REPLACED START VALVE AND OPERATIONAL CHECK NORMAL.
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 PACK SHOWED 0 DEGREES AND THE RIGHT WAS CORRECT. THIS INDICATED A FAILED TEMPERATURE BULB. THE TEMPERATURE BULBS WERE RETURNED TO THE PREVIOUS POSITIONS AND THE RIGHT TEMPERATURE BULB WAS REPLACED. OPERATIONAL CHECK OF THE PACKS NOW SHOWED CORRECT TEMPERATURES FOR BOTH SIDE.
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.
#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.
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 SOURCE FROM HIGH TO LOW STAGE. USING THE FIM AND A DESCRIPTION OF THE SYSTEM OPERATION DETERMINED EITHER THE HIGH STAGE REGULATOR OR HIGH STAGE VALVE TO BE AT FAULT. REPLACED THE HIGH STAGE REGULATOR AND NO PRESSURE INCREASE OCCURRED AT IDLE. SEE SDR COZA20161217101 FOR REPLACEMENT OF THE HIGH STAGE VALVE.
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 SOURCE FROM HIGH TO LOW STAGE. USING THE FIM AND A DESCRIPTION OF THE SYSTEM OPERATION, DETERMINED EITHER THE HIGH STAGE REGULATOR OR HIGH STAGE VALVE TO BE AT FAULT. REPLACED THE LEFT HIGH STAGE VALVE. PERFORMED AN ENGINE RUN AND THE LEFT AND RIGHT ENGINE BLEED PRESSURES MATCHED AT IDLE POWER SETTINGS CORRECTING THE PROBLEM.
LEFT RAM AIR DOOR ACTUATOR REPLACED AS PART OF TROUBLESHOOTING FOR A PACK LIGHT APPEARING ON RECALL.
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 HARNESS WAS ACCOMPLISHED WITH NO DEFECTS NOTED. A CHIP DETECTOR AND SCAVENGE SCREEN INSPECTION WAS COMPLETED ON THE LEFT ENGINE WITH NO METAL PARTICLES FOUND. THE CLOGGING TRANSMITTER S125 WAS REPLACED. THE REPAIR CONFIRMATION PART POWER LEAK CHECK WAS ACCOMPLISHED. NO OIL FILTER SIGNALS DISAGREE MESSAGE WAS DISPLAYED.
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.
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.
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.
RIGHT BLEED TRIP OFF LIGHT AT FL340 DURING AIRCRAFT CLIMBOUT. USING FIM, REPLACED THE RIGHT 390 DEG TEMPERATURE SENSOR. OPERATIONAL AND LEAK CHECK OK.
RIGHT BLEED TRIP OFF LIGHT AT FL 340 DURING AIRCRAFT CLIMBOUT. REPLACED RIGHT PRESSURE REGULATING AND SHUTOFF VALVE. LEAK AND OPERATIONAL CHECK OK.
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.
LEFT AMBER "PACK" ANNUNCIATOR ILLUMINATED ON RECALL. REPLACED THE PACK ZONE TEMPERATURE CONTROLLER PER THE FIM. OPS CHECKED OK.
LEFT AMBER "PACK" ANNUNCIATOR ILLUMINATED ON RECALL. REPLACED THE AIR CONDITIONING AND ACCESSORY UNIT PER THE FIM. OPERATIONAL CHECK OK.
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 REPLACED. OPERATIONAL CHECK PERFORMED WITH NO PACK LIGHT DISPLAYED.