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Apu

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  • 1. MENU PRINCIPAL
  • 2. THE AUXILIARY POWER UNIT, OR APU, ALLOWS THE BOEING 737 TO OPERATEINDEPENDENTLY OF GROUND SUPPORT EQUIPMENT. THE APU GENERATOR IS CAPABLEOF OPERATING THE ENTIRE ELECTRICAL SYSTEM ON THE GROUND. BLEED AIR ISAVAILABLE FOR ENGINE STARTING AND AIR CONDITIONING. THE APU CAN ALSO BEUSED IN-FLIGHT AS A BACKUP SOURCE OF ELECTRICAL POWER AND BLEED AIR, FORPNEUMATIC SYSTEMS.MENU PRINCIPAL
  • 3. THE APU MAY BE USED FOR BOTH ONE GENERATOR BUS AND FOR BLEED AIR, UP TO10,000 FEET. BETWEEN 10,000 AND 17,000 FEET, THE CAPACITY OF THE APU IS REDUCEDAND IT IS LIMITED TO EITHER ELECTRICAL, OR BLEED AIR. FROM 17,000 FEET UP TO35,000 FEET, ONLY ELECTRICAL POWER FOR ONE GENERATOR BUS IS AVAILABLE.NOTE, THIS IS 2,000 FEET BELOW THE AIRPLANE CEILING.MENU PRINCIPAL
  • 4. B IS THE CORRECT ANSWER.MENU PRINCIPAL
  • 5. THE APU CAN SUPPLY BLEED AIR UP TO 17,000 FEET MAXIMUM. (pause4) LETS LOOK ATTHE OPERATION OF THE APU.MENU PRINCIPAL
  • 6. AIR FLOWS TO THE APU THROUGH THE AIR INLET DOOR ON THE AFT PORTION OF THEAIRPLANE. THE DOOR OPENS INWARD.MENU PRINCIPAL
  • 7. AIR ENTERING THE INLET DOOR IS DIRECTED TO THE GAS TURBINE FOR COMBUSTIONAND TO THE ACCESSORY SECTION FOR COOLING. THE COOLING AIR IS CIRCULATEDAROUND THE APU WITHIN THE FIRE PROOF SHROUD, AND IS THEN DIRECTEDOVERBOARD THROUGH THE COOLING OUTLET. (pause4) LETS TALK ABOUT THECOMPONENTS OF THE ACCESSORY SECTION.MENU PRINCIPAL
  • 8. DURING NORMAL GROUND START, FUEL FOR THE APU IS SUPPLIED FROM THE NUMBERONE TANK. THE FUEL IS DIRECTED THROUGH A MOTORIZED SHUT-OFF VALVE TO THEFUEL CONTROL UNIT. THE FUEL CONTROL UNIT SUPPLIES THE PROPER AMOUNT OFFUEL TO MAINTAIN A CONSTANT SPEED UNDER VARYING LOAD CONDITIONS.MENU PRINCIPAL
  • 9. THE STARTER MOTOR IS POWERED DIRECTLY FROM THE AIRPLANE BATTERY ANDDRIVES THE ACCESSORY SECTION AND THE TURBINE DURING APU START.MENU PRINCIPAL
  • 10. THE APU OIL SYSTEM IS SELF-CONTAINED. THE AIR COOLED OIL IS USED TO COOL ANDLUBRICATE THE TURBINE BEARINGS. THE OIL PUMP IS DRIVEN FROM THE ACCESSORYSECTION, AND OIL PRESSURE SENDS A SIGNAL TO OPEN THE FUEL SOLENOID SHUT-OFFVALVE, AND TRIGGER IGNITION DURING THE STARTING SEQUENCE.MENU PRINCIPAL
  • 11. THE APU GENERATOR IS ALSO DRIVEN FROM THE ACCESSORY SECTION. IT PROVIDESTHE ELECTRICAL OUTPUT FROM THE APU. THE APU GENERATOR IS IDENTICAL TO THEENGINE DRIVEN GENERATORS. IT CAN POWER BOTH ELECTRICAL BUSSES ON THEGROUND. IN FLIGHT, THE APU CAN POWER ONLY ONE BUS. LIKE THE OIL COOLER, THEGENERATOR IS ALSO COOLED BY THE COOLING FAN.MENU PRINCIPAL
  • 12. BLEED AIR FOR THE PNEUMATIC SYSTEM IS EXTRACTED FROM THE COMPRESSOR ANDCONTROLLED BY THE APU BLEED VALVE. THE BLEED VALVE IS ELECTRICALLY ARMEDBY THE SOLENOID, BUT REQUIRES BLEED AIR PRESSURE TO OPEN. (pause4) NEXT, LETSLOOK AT THE CONTROLS AND INDICATORS FOR THE APU.MENU PRINCIPAL
  • 13. THE APU CONTROLS AND INDICATORS ARE LOCATED ON THE OVERHEAD PANEL. A SINGLEMASTER SWITCH CONTROLS THE OPERATION OF THE APU.THE SWITCH MUST BE PULLED OUT BEFORE MOVING IT FROM [`]OFF TO THE START POSITION. THESWITCH IS SPRING LOADED FROM START TO ON. AN EXHAUST TEMPERATURE INDICATORMONITORS TAIL PIPE TEMPERATURE. AN AC AMMETER INDICATES ELECTRICAL OUTPUT FROM THEAPU GENERATOR, AND FOUR LIGHTS MONITOR THE OPERATION OF THE APU. LOCATE THESECONTROLS AND INDICATORS ON YOUR PANEL.MENU PRINCIPAL
  • 14. BEFORE ATTEMPTING TO START THE APU, INSURE THE BATTERY SWITCH IS ON, AND TEST THEFIRE WARNING SYSTEM. THIS PROCEDURE WILL BE COVERED IN DETAIL DURING THE FIRE ANDOVERHEAT PROTECTION MODULE. IF THE DC SELECTOR IS IN THE BATTERY POSITION, IT ALLOWSYOU TO MONITOR BATTERY VOLTAGE AND AMPERAGE WHICH INDICATES APU STARTEROPERATION. WHEN THE AC SELECTOR IS IN THE APU GENERATOR POSITION, THE AC GUAGESPROVIDE VOLTAGE AND FREQUENCY INDICATIONS.MENU PRINCIPAL
  • 15. TO START THE APU, MOVE THE MASTER SWITCH FROM [`]OFF DIRECTLY TO START, HOLDMOMENTARILY, AND THEN RELEASE TO ON. THE FIRST VISUAL INDICATION OF THESTART SEQUENCE IS THE ILLUMINATION OF THE LOW OIL PRESSURE LIGHT.MENU PRINCIPAL
  • 16. AT THE SAME TIME THAT THE LOW OIL PRESSURE LIGHT ILLUMINATES, THE AIR INLETDOOR BEGINS TO OPEN, AND THE FUEL VALVE IN THE NUMBER 1 TANK OPENS.MENU PRINCIPAL
  • 17. THE AIR INLET DOOR TAKES APPROXIMATELY 17 SECONDS TO OPEN. ONCE IT IS OPEN,THE STARTER MOTOR IS ACTIVATED.MENU PRINCIPAL
  • 18. A HIGH CURRENT DRAW CAN BE OBSERVED ON THE DC AMMETER DURING STARTERENGAGEMENT.MENU PRINCIPAL
  • 19. DURING A NORMAL START SEQUENCE.MENU PRINCIPAL
  • 20. (pause2) A RISE IN OIL PRESSURE ACTIVATES THE IGNITION. THEN, A SIGNAL IS SENT TOTHE FUEL SOLENOID SHUT-OFF VALVE. THE VALVE OPENS ALLOWING HIGH PRESSUREFUEL TO ENTER THE COMBUSTION CHAMBER.MENU PRINCIPAL
  • 21. THE STARTER MOTOR WILL CUT OUT AT THE PROPER SPEED AS THE TURBINEACCELERATES. THIS CAN BE OBSERVED IN THE COCKPIT BY THE DC AMMETERINDICATIONS RETURNING TO NORMAL.MENU PRINCIPAL
  • 22. EXHAUST GAS TEMPERATURE WILL RISE INTO THE NORMAL OPERATING RANGE AND THELOW OIL PRESSURE LIGHT WILL EXTINGUISH.MENU PRINCIPAL
  • 23. WHEN THE TURBINE APPROACHES FULL SPEED, THE BLUE, APU GENERATOR [`]OFF BUSLIGHT ON THE GENERATOR CONTROL MODULE ILLUMINATES.MENU PRINCIPAL
  • 24. WITH THE BLUE LIGHT ILLUMINATED, THE APU GENERATOR IS READY FOR USE.MENU PRINCIPAL
  • 25. ANSWER C IS CORRECT.MENU PRINCIPAL
  • 26. THE LOW OIL PRESSURE LIGHT IS THE FIRST INDICATION OF A START, AND THEGENERATOR [`]OFF BUS LIGHT INDICATES THE START CYCLE IS COMPLETE.MENU PRINCIPAL
  • 27. TO CONNECT THE APU GENERATOR TO THE AIRPLANE ELECTRICAL SYSTEM, POSITION THE APUGENERATOR CONTROL SWITCHES TO []ON AND RELEASE TO NEUTRAL. AFTER ONE BUS HAS BEENCONNECTED, THE BLUE APU GENERATOR [`]OFF BUS LIGHT, BOTH AMBER TRANSFER BUS [`]OFFLIGHTS, AND THE RESPECTIVE GENERATOR AMBER BUS [`]OFF LIGHT EXTINGUISH. (pause3) THEAPU CAN POWER BOTH GENERATOR BUSSES ON THE GROUND BUT ONLY ONE GENERATOR BUS INFLIGHT. WHENEVER THE APU IS OPERATING AND AC ELECTRICAL POWER IS ON THE AIRPLANEBUSSES, EXTENDED SERVICE LIFE OF THE APU FUEL CONTROL UNIT CAN BE REALIZED BYOPERATING AT LEAST ONE FUEL BOOST PUMP TO SUPPLY FUEL UNDER PRESSURE TO THE APU.MENU PRINCIPAL
  • 28. ANSWER C IS CORRECT.MENU PRINCIPAL
  • 29. IN FLIGHT, THE APU GENERATOR WILL POWER ONE BUS UP TO 35,000 FEET. REMEMBERTHAT THE APU GENERATOR WILL POWER TWO BUSSES ON THE GROUND BUT ONLY ONEBUS IN THE AIR.MENU PRINCIPAL
  • 30. THE APU BLEED SWITCH, ON THE PNEUMATIC PANEL, CONTROLS APU BLEED AIR. APUPRESSURE OUTPUT CAN BE MONITORED ON THE PNEUMATIC PRESSURE INDICATORWHEN THE APU BLEED VALVE IS OPEN. BEFORE USING APU PNEUMATICS, WAIT ONEMINUTE AFTER APU START UP FOR THE INTERNAL ENGINE TEMPERATURE TO STABILIZE.THE APU WILL THEN BE READY FOR BLEED AIR USE. LOCATE THESE CONTROLS.MENU PRINCIPAL
  • 31. THE APU BLEED VALVE IS ELECTRICALLY CONTROLLED, BUT REQUIRES BLEED AIRPRESSURE TO OPEN. HOWEVER, THE GENERATOR OUTPUT HAS PRIORITY OVER THE AIRREQUIREMENT. FLUCTUATIONS IN THE PNEUMATIC DUCT PRESSURE INDICATION WILLOCCUR AS THE BLEED AIR VALVE AUTOMATICALLY MODULATES TOWARDS CLOSED TOMAINTAIN THE GENERATOR DEMANDS.MENU PRINCIPAL
  • 32. PRIOR TO SHUTDOWN, THE APU MUST BE OPERATED FOR ONE MINUTE WITHOUTPNEUMATIC LOAD TO PERMIT THE EGT TO DECREASE. TO UNLOAD THE APUPNEUMATICALLY, SELECT BOTH PACK SWITCHES OFF, OR SELECT THE APU BLEEDSWITCH TO OFF. AFTER ONE MINUTE, POSITION THE APU CONTROL SWITCH TO OFF.MENU PRINCIPAL
  • 33. OCCASIONALLY IT MAY BE NECESSARY TO PARK AND SECURE THE AIRPLANE. TOACCOMPLISH THIS AFTER THE APU SWITCH HAS BEEN SELECTED TO OFF, ALLOWAPPROXIMATELY TWENTY SECONDS BEFORE SELECTING THE BATTERY SWITCH OFF.THIS WILL PROVIDE TIME FOR THE APU AIR INLET DOOR TO CLOSE, AFTER BOTH FUELVALVES HAVE CLOSED, AND WILL PROVIDE FIRE DETECTION UNTIL THE APU HASCOOLED.MENU PRINCIPAL
  • 34. C IS THE CORRECT ANSWER.MENU PRINCIPAL
  • 35. EITHER THE ACTION OF TURNING OFF BOTH PACKS, OR CLOSING THE APU BLEED AIRVALVE, WILL PNEUMATICALLY UNLOAD THE APU. SELECTING GROUND POWER []ON ORSELECTING BOTH APU GENERATOR SWITCHES [`]OFF WILL ELECTRICALLY UNLOAD THEAPU.MENU PRINCIPAL
  • 36. LETS REVIEW THE START PROCEDURES. FIRST, INSURE THE BATTERY SWITCH IS []ON.THEN MOVE THE MASTER SWITCH THROUGH []ON TO THE START POSITION ANDRELEASE IT. IT IS SPRING LOADED TO THE []ON POSITION. WHEN THE BLUE APUGENERATOR [`]OFF BUS LIGHT ILLUMINATES, THE START CYCLE IS COMPLETE, AND APUELECTRICAL POWER IS AVAILABLE. AFTER WAITING ONE MINUTE, APU BLEED AIR ISAVAILABLE FOR PNEUMATICS. THE AUTOMATIC FEATURES OF THE APU TAKE CARE OFALL THE INTERMEDIATE STEPS.MENU PRINCIPAL
  • 37. REVIEW THE APU LIMITATIONS IN THE OPERATIONS MANUAL AT THIS TIME AND PRACTICETHE APU STARTING PROCEDURE. OTHER LIMITATIONS ON USE OF THE APU BLEEDVALVE WILL BE DISCUSSED IN PNEUMATICS.MENU PRINCIPAL
  • 38. ANSWER C IS CORRECT.MENU PRINCIPAL
  • 39. IN FLIGHT, ENGINE AND APU GENERATORS ALL HAVE A ONE HUNDRED ELEVEN AMPERELOAD LIMIT. ON THE GROUND, HOWEVER, THE APU HAS ADDITIONAL COOLING AND MAYCARRY A MAXIMUM LOAD OF ONE HUNDRED TWENTY-FIVE AMPERES. SINCE THEAIRPLANE IS ON THE GROUND, THE APU MAY CARRY THE ONE HUNDRED TWENTYAMPERE LOAD SHOWN HERE WITHOUT EXCEEDING THE LIMITS.MENU PRINCIPAL
  • 40. NOW, REVIEW APU OPERATION IN THE SUPPLEMENTARY SECTION OF YOUR OPERATIONSMANUAL.MENU PRINCIPAL
  • 41. THIS CONCLUDES THE SECTION ON APU. YOU SHOULD BE ABLE TO START, MONITOR,CONNECT THE APU OUTPUTS TO THE AIRPLANE SYSTEMS, AND SHUT DOWN THE APU.MENU PRINCIPALRETURN TO MENU

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