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52 Cards in this Set
- Front
- Back
At what kVA are the APU generators rated?
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30kVA
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Name the 6 AC buses that receive power from the main generators
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AC 1 & 2
AC Utility 1 & 2 AC Essential AC Service |
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What are the sources of power for 28V DC
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TRUs or ground power
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What is the volt and amp hour rating for the MAIN and APU battery
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17 Amp/hr, 24 volt main battery, 43 Amp/hr, 24 volt APU battery
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Name the 5 TRUs
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TRU 1 & 2
TRU Essential 1 & 2 TRU Service |
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Name the 7 DC buses
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DC 1 &2
DC Utility 1 & 2 DC Essential DC Service DC Battery |
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Cranking power for starting the APU is provided by:
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APU battery via ECU
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What is the rating for the air driven generator?
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115 volt, 400Hz AC power rated at 15kVA
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What does the ADG supply power to?
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ADG Bus, which subsequently powers AC ESS Bus and its dependents.
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What powers the MAIN and APU battery charger?
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Main – AC utility bus 1, APU – AC utility bus 2
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Where is the external AC power receptacle located?
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Forward right side of the fuselage
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Where is the external DC power receptacle located?
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Right engine pylon
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Where are electrical system warnings and caution messages displayed?
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EICAS primary page
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Where are electrical system status and advisory messages displayed?
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EICAS AC and DC synoptic pages.
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What does the constant speed drive do?
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Maintains constant RPM for the Integrated Drive Generators (IDG) by hydro-mechanically changing the variable input speed from the engine gearbox.
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What will cause the IDG’s to auto disconnect from the gearbox?
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In a severe overtemperature or overtorque condition. Indicated by sheared Quill Shaft (overtorque) or fused Solder Ring (overtemp)
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What will cause the illumination of the IDG fault light?
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In low oil pressure or high oil temperature, the amber cover-guarded switchlight (safety version of a PBA) on the EPSP will illuminate (broken Quill Shaft or fused Solder Ring).
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Describe how the IDG is disconnected when the IDG DISC switch is pushed.
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IDG Fault PBA is uncovered, then pressed, which disconnects the IDG from the engine gearbox.
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Can the IDG be reconnected in flight after it is disconnected.
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No – only on ground, after landing, and without engines running
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What is the RPM that the generators need to turn at in order to produce the correct output?
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12,000 RPM
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What provides fault protection for each generator?
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Generators are monitored by Generator Control Units (GCUs) for voltage, frequency, and amperage to provide fault-protective shutdowns.
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List the priority for allowing power to AC Bus 1 and AC Bus 2.
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AC Bus 1: IDG 1, APU, IDG 2, External Power;
AC Bus 2: IDG 2, APU, IDG 1, External Power |
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What supplies power to the TRU’s and what are their output ratings? (power supply for each of 2 Normal TRUs, 2 Essential TRUs, 1 Service TRU)
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AC Bus 1 – TRU 1
AC Bus 2 – TRU 2 & ESS TRU 2 AC ESS – ESS TRU 1 AC SERV – SERV TRU Rated at 100Amp, 28Volt |
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Explain how DC BUS 1 and DC BUS 2 are provided with backup power and what switches are used to control this backup?
NOT INCLUDED - NO ANSWER AVAILABLE |
Backup from opposite side TRU 1 or 2 through TIE 1 and TIE 2
For instance, TRU 2 fails. Both TIE 1 AND TIE 2 must close, disabling DC UTIL BUS 1 AND 2, but providing power to DC BUS 2 |
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What will cause the ADG to auto deploy?
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During complete AC power failure in flight
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What busses provide power to the battery chargers?
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AC Utility Bus 1 – Main Battery
AC Utility Bus 2 – APU Battery |
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On the ground, when are the battery chargers powered?
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Flaps at 0 degrees
Main door open External AC power disconnected |
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What will cause the battery chargers to auto shut-down?
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If there is a fault in the battery itself or when charging exceeds 90 minutes.
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What are the modes of operation for the battery chargers?
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MAIN and TOPPING
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When do the battery chargers switch modes of charging?
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When battery temperature is either above or below -29C.
Above -29C = MAIN Below -29C = TOPPING |
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What are the amp outputs in the different modes of charging for the APU and Main Battery chargers?
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MAIN – main battery @ 20 Amps, APU battery @ 40 Amps.
TOPPING – main battery @ 5 Amps, APU battery @ 10 Amps. |
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At what temperature will the IDG fault light come on?
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160 degrees Celsius
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What does a fail light illuminated by one of the auto transfer switches indicate?
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A fault preventing autotransfer
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Selecting the ADG unit test switch to unit checks what?
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ADG system circuits
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"Ampere"
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A measure of electric flux
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"Volt"
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A measure of electric power
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"Watt"
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A measure of electric work
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"Ohm"
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A measure of resistance to electric flux
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"DC"
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Direct (electrical) current
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"AC"
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Alternating (electrical) current
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"Cycle"
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A single unit which is part of a repeating process
OR to rotate or actuate a circuit breaker, valve, or connection |
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"Period"
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The duration from one point in a cycle to its appearance in the next full cycle.
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"Frequency"
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repititions of periods per given unit of time
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"Phase"
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moment of positive or negative current in AC power. A single current may have multiple phases, such as the ADG, which provides 3-phase power.
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"Transformer"
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Mechanical unit which increases or decreases voltage
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"TRU"
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Transformer-Rectifier Unit
Performs all actions of a normal transformer, in addition to converting AC to DC power. |
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"Inverter"
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Converts DC to AC power
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"Series Circuit"
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A circuit wired in-line so that all power is constant regardless of individual resistance (all units fail of circuit is broken, but maintains more uniform power).
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"Parallel Circuit"
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A circuit where each item is on separate links so that a single failed wire will not power down the rest of the units on the circuit (Amperage shifts in all lines if any line is broken)
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"CSD"
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Constant Speed Drive
Mechanical gearing which contains a hydromechanically actuated monitor to increase or decrease incoming mechanical power and maintain a constant RPM output. |
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What does the main battery provide backup power for? (6)
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AHRS (Attitude Heading Reference System)
PSEU (Proximity Sensor Electronic Units) APU ECU (Electronic Control Unit) EICAS DCUs (Data Concentrator Units) Clocks Flight Compartment Lighting |
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"EPSP"
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Electrical Power Services Panel
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