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18 Cards in this Set
- Front
- Back
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DESCRIBE THE APU
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1-SELF CONTAINED GAS TURBINE ENGINE IN THE TAIL CONE
2-IT OPS THE APU GEN & IS A SOURCE OF BL AIR THAT CAN BE USED FOR ENG START & THE 2 AIR COND PACKS |
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WHERE'S THE APU INLET & EXHAUST
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INLET-THE RIGHT SIDE OF THE TAIL CONE
EXHAUST-THROUGH THE TAIL |
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FUNCTION OF THE ELECTRONIC CNTL UNIT
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1-CONTROLS & MONITORS THE APU OPS
2-APU AUTOMATICALLY STOPS FOR DANGEROUS OPS 3-APU AUTOMATICALLY CNTL'S THE DUCT PRESS FOR THE ENG START & AIR CON |
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APU ALT LIMITATIONS
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1-APU START AND OPERATED TO -41 000FT(AIRCRAFT LIMIT)
2-SUPPLY ELEC PWR -41 000FT 3-SUPPLY BLEED AIR -17 000FT 4-SUPPLY ELEC PWR & BL AIR -10 000FT |
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WHAT PWR IS USED TO START THE APU
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EITHER
- 115V AC PWR OR -28V DC PWR |
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FOR THE APU TO OPERATE YOU NEED BAT SW ON, WHY
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FOR FIRE DETECTION AND APU START CCTS
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WHAT TRANSPIRES WHEN YOU PUT THE APU SW ON
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1-APU INLET DOOR OPENS
2-APU FUEL SHUTOFF VALVE OPENS 3-BAT DISCH ILLUMS FOR A SHORT TIME 4-LOW OIL PRESS ILLUMS THEN EXTINGUISHES 5-APU GEN OFF BUS ILLUMS WHEN START CYCLE COMPLETE |
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WHEN IS APU SET TO OFF
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NMLY BEFORE TAXI
MAY BE USED FOR T/O |
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WHAT HAPPENS WHEN THE APU IS SET TO OFF
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1-APU GEN IS DISCONNECTED
2-APU BL VALVE CLOSES 3-COOLING CYCLE BEGINS 60 SEC IS STARTED 4-COOLING PERIOD COMPLETE-APU FUEL VALVE CLOSES 5-AIR INLET DOOR CLOSES- APU SHUTDOWN COMPLETE 4- |
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TO SHUT DOWN THE APU IMMEDIATELY USE
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1-APU FIRE SWITCH OR FLT DECK OR
2-APU FIRE CNTL HANDLE IN MAIN WHEEL WELL 3-TURN OFF BAT SW |
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APU ANNUN LIGHTS-MAINT MEANS
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A MAINT PROB. APU CAN BE USED
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LOW OIL PRESS
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ON EARLY IN START SEQUENCE, OTHER TIMES CAUSES AUTOMATIC SHUTDOWN
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FAULT
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SEVERAL POSIBLE PROBLEMS
-AUTOMATIC SHUTDOWN -APU FUEL VALVE DOES NOT CLOSE AFTER SHUTDOWN |
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OVERSPEED
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OVERSPEED OR LOSS OF OVERSPEED PROTECTION-
AUTOMATIC SHUTDOWN |
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APU GEN OFF BUS
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APU UP TO SPEED AND CAN ACCEPT LOAD
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WHEN APU IS THE ONLY SOURCE OF POWER THEN
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-GALLEY BUSES AUTOMATICALLY DISCONNECT IN THE AIR
-ON THE GND THE APU TRIES TO ENERGIZE ALL ALL SYSTEMS(UNLESS LOAD TOO LARGE) |
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WHAT'S THE ORDER OF LOAD SHEDDING
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-1ST- THE GALLEY BUSES
-2ND-THE MAIN BUSES ONE AT A TIME UNTIL LOAD IS SATIS |
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ON APU SHUTDOWN, WHAT HAPPENS WHEN APU SW IS TURNED OFF
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1-APU OFF SW
2-APU GEN DISCONN 3-APU BL VALVE CLOSES 4-ONE MIN COOLING CYCLE 5-APU FUEL VALVE CLOSES SHUTDOWN COMPLETE 6-WAIT 20SEC AFTER APU GEN OFF BUS EXTING FOR INLET DOOR TO CLOSE 7-BAT SW OFF |
