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42 Cards in this Set
- Front
- Back
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What is the min HP% RPM to consider when using the HMG?
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67%
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During HMG operation, why does the utility pump operate continuously if it is armed?
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Because the flt hyd cont circuit is on the L MAIN DC bus, which is no longer powered (util solenoid SOV fails open)
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Control of elec current and auto-switching for AC & DC is supplied by what component?
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AC BPCU
DC BPCU |
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Is load shedding necessary with the failure of a single alternator/converter?
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No
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What is the difference in the corrective action for a "DC PWR FAIL" versus "AC PWR FAIL"?
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If a "DC PWR FAIL" occurs, converter operation may be continued. With the "AC PWR FAIL", the converter must be turned off since the fans require AC pwr.
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If a converter fails, what are the resulting indications?
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AC PWR FAIL
DC PWR FAIL AC & DC buses will auto switch over to next available power source |
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What busses are powered when using SEPS?
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ESS DC
ESS AC, phase A only |
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Why are the 6 EPMP "AUTO" bus switch seloected under normal flight ops?
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To allow the bus power control units (BPCUs) to select the best available power source for each bus
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What power source normally provides power to ESS DC bus in flight?
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DC portion of the left converter thru the L MAIN DC bus
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With the left converter failed, what is the power source for the L MAIN DC bus?
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the TRU
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What is indicated by an 'EPMP PWR FAIL" CAS message?
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At least 1 of the 4 power sources of the remote power supply has failed
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What is indicated by the battery ammeters on EPMP?
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Battery charge and discharge in amps
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How is the normal power source for the ESS DC bus indicated on EPMP after engine start with both converter switch ON?
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ESS DC bus AUTO and LEFT MAIN lights illuminate
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What is the normal power source for the ESS DC bus after engine start with both converter switches ON?
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Whatever power source is providing power to the L MAIN DC bus (normally the DC portion of left converter)
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The "ESS" power monitor switch on the EPMP when selected provides display info about which elec power sources?
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ESS DC and ESS AC bus voltage
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On the EPMP the left and right voltmeter selector switch allow monitoring of what components?
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left and right converters
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Where does the EPMP receive its power from?
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remote power supply
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What is the max output of the TRU?
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28 VDC, 300 amps (150 amps when using HMG)
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What is the function of the TRU?
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Converts AC power to 300 amps DC power
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If the "BATT" lights are illuminated in flight with normal power, what does it mean?
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The battery contactor relays are closed (the battery tie bus is powered)
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If the ESS DC BUS AUTO, LEFT MAIN and BATT switch capsules are illuminated simultaneously in flight, what has occurred?
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K20/K22 relay has experienced a failure of one of the relay poles, report for maintenace action.
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What is the max allowable AC AUX PWR load indication prior to TAY engine?
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35%
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If the APU is running and AUX power in ON, what would happen if both batts were turned OFF?
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No change would occur. APU alternator would continue to provide power to MAIN and ESS busses.
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Is it possible to start the APU using EXT DC PWR?
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Yes but the abnormal procedure in the QRH must be referenced.
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What is indicated by an amber AC or DC reset light?
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A fault on an AC or DC bus
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What power source normally provides power to ESS AC bus in flight?
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AC portion of left converter thru the L MAIN AC bus
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What is the min acceptable batt voltage when performing a batt integrity check?
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22 volts DC
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What is the voltage and ampere rating of the batteries?
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24 volt DC
40 amp/ hr |
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With both battery switches ON and no other power on airplane, which elec busses are shown as powered ON the EPMP?
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ESS DC powered by batts
ESS AC phase A only powered by "E" inverter |
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With batt power selected ON and no other power sources available, what are acceptable readings on the ESS AC and ESS DC bus volts?
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115 VAC
400 HZ 22-27 VDC |
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What busses are powered by the ext batt switch?
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ESS DC bus
ESS AC bus ph A only |
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Where can info be found concerning items powered by emer batts?
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QRH
Electrics EA-26 |
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How are the emer batts normally tested?
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Arm the switch with no other power on A/C
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Where are the feeder CBs located?
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PDB
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How is AC external power connected to A/C?
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Select AUX power switch with either or both batts ON or batt override ON
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What is the function of the batt override on the external AC power reseptacle?
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To connect AC power if the batts are discharged or removed
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What busses are powered with external DC power connected?
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L & R Main DC
ESS DC ESS AC thru "E" inverter ph A only |
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What busses are powered with external AC power connected?
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All of the busses are powered.
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What is the function of the "E" inverter?
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To provide an alternate source of power to the ESS AC bus (Ph A only)
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What is the output rating of the "E" inverter?
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800 VA
.8 KVA |
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Is it possible to charge the main batts using external DC power?
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No, main AC busses must be powered to charge batteries
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What is the immediate consideration with a dual converter failure in flight?
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Single boost pump operation with crossflow open to reduce rate of battery discharge
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