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25 Cards in this Set
- Front
- Back
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AC power is normally supplied by ___ VFG's to each of ___ dedicated main AC buses in the AC Power Center. During single generator operations, AC Buses ___ and ___ will be powered
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4,4,1 and 4
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Emergency AC power is supplied by a RAM Air Turbine (RAT) flat rated at 115/200 Volts, 9 KVA and 340-440 Hz. The RAT sheds its electrical output to give priority to it's hydraulic functions at apprx
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147 kts
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The RAT generator, when in operation supplies AC power through the RAT Line Contactor to
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AC ESS Bus in the CCBP
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On the cockpit Electrical Control Panel, an illuminated cyan AVAIL indication on the External AC PBA indicates that
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External power is connected to the aircraft in the correct phase, voltage and frequency
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On the cockpit Electrical Control Panel, an illuminated green ON indication on the guarded RAT GEN control switch relates that
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The RAT has deployed and its generator is on line
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The VFG push buttons on the Cockpit Electrical Control Panel are used to
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Turn each VFG off and reset a fault
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The EICAS warning message, EMER PWR ONLY indicates that
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Either the RAT is powering AC ESS Bus or the batteries are feeding the DC ESS Bus and battery buses in an emergenchy condition
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You have an on indication in the EXT AC push button annunciator on the Cockpit Electrical Control Panel and are starting the APU. Once the APU is on line the
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EXT AC ON Indication will remain illuminated even though the AC Buses are powered by the APU Gen
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When used together for emergency peuposes, the two aircraft batteries can provide DC power for
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15 mins
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The avionics and APU batteries each have seperate battery chargers. These chargers protect their respective batteries from a variety of faults and will automatically
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Shut themselves off when they sense a battery fault and shut themselves off when they sense an associated internal charger fault and annunciate the shutdown
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There are ___ primary sources of power, which are monitored, swithched, distributed and controlled by the ___
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6, DCPC
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The six primary sources of DC power are
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4 TRU's, The Avionics Batt, and the APU Batt
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Three TRU's are required to power all DC Buses. During single TRU operations the following DC buses are shed
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DC Bus 1 and DC Bus 2
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When the battery switch is in the EMS positin, battery power is supplied to the
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EMS CDU only
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A DC BUS 1 FAIL annunciation on the EICAS display indicates that
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DC Bus 1 is not being powered
DC Bus 1 has an intenal fault DC Bus 1 has been shed do to multiple failures |
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A DC BUS MAN OFF annunciation on the EICAS indicates that
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DC Buss 2 has been manually isolated through the EMS CDU
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The BATT EMER PWR ON annunciation on the EICAS display indicates that
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The batteries are feeding the DC Ess Bus and DC Battery Buses in an emergency condition
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A CHARGER message adjacent to the APU BATT symbol on the DC Synoptic page indicates that
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The Battery is bnot charging
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As a priority, the DCPC will ensure TRU power is always directed to
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The DC Battery Bus and the DC Ess Bus
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You have experienced a complete AC power failure and the RAT nhas automatically deployed
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The AC Ess Bus will be powered along with the DC Battery Bus and DC Ess Bus. APU and Avionics batteries will not be charged
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The CNTL key on the EMS CDU is used to
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Display system control options such as AC and DC Cabin Feeds EMS
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An EMS CDU test fiunction can be terminated
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By reselecting the associated activation key on the right side of the EMS CDU panel
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The APU Generator is a constant frequency device limited to
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40 KVA
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External DC power, when connected to the aircraft and selected ON by the EXT DC control switch in the cockpit
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directs external DC power to the DC battery bus and the DC Ess Bus
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The RAT will automatically deploy when
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1. there is a loss of all AC power due to the loss of all engines
2. There is a loss of all AC power with the flaps greater than 0 3. There is a loss of all AC power with the flaps fully retracted and 14 seconds has elapsed |
