N733KA

Part: IMPELLER — INTERMITTENT (FUEL PUMP) · airframe 45,633 hrs · 23,834 cycles

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.

Part: BUSHING — MISSING (ENGINE) · airframe 29,609 hrs · 17,308 cycles

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.

Part: CONVERTER — INTERMITTENT (E&E BAY) · airframe 45,580 hrs · 23,818 cycles

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.

Part: START VALVE — INOPERATIVE (RT ENGINE) · airframe 44,745 hrs · 23,636 cycles

RIGHT ENGINE START VALVE WOULD NOT OPEN FAR ENOUGH TO ALLOW FOR ENGINE START. REPLACED START VALVE AND OPERATIONAL CHECK NORMAL.

Part: SENSOR — FAILED (CABIN TEMP) · airframe 44,109 hrs · 23,502 cycles

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.

Part: WIRE HARNESS — SHORTED (NR 2 NACELLE) · airframe 43,821 hrs · 23,440 cycles

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.

Part: FIRE DETECTOR — INTERMITTENT (NR 2 ENGINE) · airframe 43,821 hrs · 23,440 cycles

#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.

Part: REGULATOR — INTERMITTENT (ZONE 500) · airframe 43,801 hrs · 23,436 cycles

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.

Part: VALVE — STICKING (ZONE 500) · airframe 43,801 hrs · 23,436 cycles

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.

Part: ACTUATOR — INTERMITTENT (RAM AIR DOOR) · airframe 43,636 hrs · 23,402 cycles

LEFT RAM AIR DOOR ACTUATOR REPLACED AS PART OF TROUBLESHOOTING FOR A PACK LIGHT APPEARING ON RECALL.

Part: TRANSMITTER — INTERMITTENT (OIL CLOG) · airframe 43,540 hrs · 23,382 cycles

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.

Part: VALVE — INTERMITTENT (CABIN TEMP) · airframe 43,491 hrs · 23,372 cycles

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.

Part: SENSOR — FAULTY (ZONE 600) · airframe 43,480 hrs · 23,369 cycles

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.

Part: SENSE LINE — LEAKING (RT BLEED) · airframe 43,491 hrs · 23,372 cycles

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.

Part: SHUTOFF VALVE — INTERMITTENT (BLEED SYS) · airframe 43,491 hrs · 23,372 cycles

RIGHT BLEED TRIP OFF LIGHT AT FL 340 DURING AIRCRAFT CLIMBOUT. REPLACED RIGHT PRESSURE REGULATING AND SHUTOFF VALVE. LEAK AND OPERATIONAL CHECK OK.

Part: SENSOR — INTERMITTENT (BLEED TEMP) · airframe 43,491 hrs · 23,372 cycles

RIGHT BLEED TRIP OFF LIGHT AT FL340 DURING AIRCRAFT CLIMBOUT. USING FIM, REPLACED THE RIGHT 390 DEG TEMPERATURE SENSOR. OPERATIONAL AND LEAK CHECK OK.

Part: ACTUATOR — FAULTY (RAM AIR DOOR) · airframe 43,480 hrs · 23,369 cycles

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.

Part: ACCESSORY UNIT — INTERMITTENT (A/C PACK) · airframe 43,402 hrs · 23,353 cycles

LEFT AMBER "PACK" ANNUNCIATOR ILLUMINATED ON RECALL. REPLACED THE AIR CONDITIONING AND ACCESSORY UNIT PER THE FIM. OPERATIONAL CHECK OK.

Part: CONTROLLER — INTERMITTENT (LT A/C PACK) · airframe 43,402 hrs · 23,353 cycles

LEFT AMBER "PACK" ANNUNCIATOR ILLUMINATED ON RECALL. REPLACED THE PACK ZONE TEMPERATURE CONTROLLER PER THE FIM. OPS CHECKED OK.

Part: ACTUATOR — FAULTY (RAM AIR DOOR) · airframe 43,383 hrs · 23,349 cycles

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.