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30 Cards in this Set
- Front
- Back
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What is the minimum accumulator pressure for starting APU?
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2,650 PSI
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What is the APU fuel consumption rate?
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150 lbs per hour
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The APU is monitored and controlled by?
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ESU
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To maintain BIT codes after failure, what power is required and what position must the APU control switch be in?
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DC power and switch is in the On position
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At what PSI does the ACCUM LOW advisory appear?
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2,650 PSI
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Pressurized fuel is supplied from which fuel tank.
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Left fuel tank
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What switch when placed in the ON position initiates the the APU start sequence?
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APU CONTR switch
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What switch when placed in the ON position makes electrical power available?
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APU GENERATOR
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How many seconds will the backup pump stay on once it has been cycled to the OFF or AUTO position?
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90 seconds
180 seconds with winterization kit installed |
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When will the ACCUM LOW advisory light extinguish?
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Once the accumulator is recharged
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What action must be taken when the APU does not start and the APU ACCUM LOW advisory light is not illuminated?
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A start may be attempted by simultaneously moving the APU CONTR switch to ON and actuating the manual START/OVERRIDE lever located on the accumulator manifold
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What are the four segment lights that monitor APU operation?
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APU ON, APU FAIL, APU OIL TEMP HI, and APU ACCUM LOW
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What kind of faults could occur when the APU FAIL light illuminates?
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High Ng, Low Ng, High TGT, Low TGT, low oil pressure, or start sequence failure
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What does the APU OIL TEMP HI indicate?
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The APU has reached the maximum oil temperature for continuous operation
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The ESU displays APU faults by using what indicators?
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Built in Test (BIT)
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How long must you wait to check the APU oil level?
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1 hour after APU shutdown
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Where is the APU oil supply contained?
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In the APU gearbox oil sump
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Why does the backup pump have a limited operating time when the rotor system is static?
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To prevent hydraulic fluid overheating
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What is the operating time and cool down time for the backup hydraulic pump when the outside air temperature (OAT) is 33 to 38 degrees C?
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24 on, 72 off
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What is the operating time and cool down time for the backup hydraulic pump when the outside air temperature (OAT) is 39 to 60 degrees C?
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16 on, 48 off
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How long can you operate the APU if the APU exhaust is less than 15 feet from the nearest aircraft or object?
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None, you cannot operate the APU.
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How long can you operate the APU if the APU exhaust is 15-20 feet from the nearest aircraft or object?
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3 minutes
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How long can you operate the APU if the APU exhaust is 20-30 feet from the nearest aircraft or object?
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10 minutes
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How long can you operate the APU if the APU exhaust greater than 30 feet from the nearest aircraft or object?
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Unlimited-ambient temperature is less than 60 degrees celsius
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What must be done if the APU FIRE light illuminates?
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Pull APU t-handle
Confirm fire Fire Extinguishing switch to RESERVE-MAIN if available Fire Extinguisher as required FUEL PUMP swich OFF APU CONTR switch OFF |
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How long must you wait after APU shutdown before attempting restart?
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2 minutes
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What must be done if the APU FAIL light comes on?
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Do not secure battery or APU CONTR switches
Check ESU BIT indicators Restart APU by resetting BATT and APU CONTR swtiches |
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What must be done if the APU GEN light comes on?
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Put APU GENERATOR switch to RESET, then ON
IF CAUTION REMAINS Put APU GENERATOR switch to OFF |
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What must be done if the APU OIL HOT light comes on?
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APU CONTR/CTRL switch OFF
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After shutting down due to APU OIL HOT light comes on, how long must you wait to restart the APU?
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60 minutes
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