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51 Cards in this Set
- Front
- Back
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How is the electrical system managed when a fault occurs?
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The electrical system monitors itself for faults and automatically disconnects a Generator
bus from its power source when electrical power is out of limits |
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What is the normal source of power for an AC TRANSFER bus?
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Respective GEN bus
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CONDITIONS: Both engine driven generators on line; APU shut down; BUS TRANSFER switch
in the AUTO position. Which buses are not powered if # 2 engine driven generator trips off? |
Generator bus and Main bus on failed side
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What is the power source for TR-3?
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Main Bus #2
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What is the normal source of power for TRs 1 and 2?
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Respective AC TRANSFER buses
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What is the "backup" source of power for DC Bus 1?
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#2 TR
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How does the TR 3 disconnect relay normally function?
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Automatically opens during an A/P or FD approach at glide slope capture
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What is the power source for the Hot Battery bus when all aircraft buses are powered?
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Battery charger
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What is the normal source of power for the AC Ground Service bus?
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#1 Generator Bus
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What is the normal source of power for the Battery bus?
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TR 3
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What is the normal source of power for the Battery Charger?
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AC GRND SERVICE bus
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The aircraft is in flight with only the battery for electric power. Where does the power come from
for the AC and DC Standby buses? |
Static Inverter for the AC Standby bus, and Battery bus for the DC Standby bus
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What is the alternate power source for the Battery bus?
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Hot Battery bus
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What is the alternate source of power for the Hot Battery bus when the normal power source is
not available |
Battery
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What is the alternate power source for the Battery Charger
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Main Bus 2
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What is the purpose of the CSD?
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Change variable engine speed into constant generator drive speed
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Which DC Selector positions display DC amps?
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TR's 1,2,3, and BAT
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Which of the following must be accomplished to check the battery condition?
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Turn on the battery switch, place DC meter selector to BAT, check volts within limits
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How is a failure of TR 1 indicated with the TR 3 disconnect relay closed?
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0 amps, normal volts indicated on the DC meters at the TR 1 position
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How would a failure of the static inverter be indicated during the standby power check?
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0 volts on the AC volt meter, and 0 cps on the AC frequency meter
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What is the function of the ON position of the galley power switch?
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Powers all galleys when both Generator buses are powered
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With the battery switch ON, which statement is correct?
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Both the Battery bus and Switched Hot Battery bus are powered
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Which statement describes establishing power to the Ground Service Bus on the ground?
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GRD POWER AVAILABLE light on, GROUND SERVICE switch on
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What does an illuminated STANDBY PWR OFF light indicate?
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The AC Standby bus is unpowered
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What is the function of the AUTO position of the STANDBY POWER switch with loss of all AC
power? |
Allows the BATTERY BUS to be the source of power for both Standby buses inflight
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What does an illuminated CSD HIGH OIL TEMP light indicate?
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CSD oil temperature exceeds operating limits
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Which is correct for disconnecting a CSD?
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Hold generator drive disconnect switch to DISCONNECT momentarily. The CSD may reengaged
on the ground by maintenance |
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What does an illuminated GRD POWER AVAILABLE light indicate?
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Ground cart is plugged in and external bus is powered
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What is the function of the ON position of the GRD PWR switch?
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Connects ground power to both Generator buses if the ground power quality is correct
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What is the function of the OFF position of the BUS TRANSFER switch?
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Prevents operation of bus transfer relays, prevents battery charger from switching to
Main Bus 2, and opens TR 3 disconnect relay |
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What does an illuminated BUS OFF amber light indicate ?
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The respective Generator bus is unpowered
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What does an illuminated TRANSFER BUS OFF light indicate?
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Respective Transfer bus is unpowered
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What is the function of the APU Generator switches?
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Connects generator output to Generator bus if power quality is correct
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In flight, the AC Ground Service bus is powered by:
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Generator Bus 1
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Engine driven generator maximum load is
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125 Amps
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In the air, galley power is available only when both generator buses are powered
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TRUE
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All power sources to a GEN BUS must be manually connected through the movement of a
switch |
True
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What are the Transformer Rectifier operating parameters?
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24-30 volts
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With a loss of all generators, a fully charged battery can supply power to the standby buses for
at least |
30 minutes
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On the ground, alternate power for the Standby buses requires
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Standby power switch at BAT
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With loss of normal AC power in flight, power for the Standby AC and Standby DC buses is
automatically available from: |
Battery bus and Static inverter
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A ground service bus control switch, labeled "GROUND SERVICE" is located on the
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Forward flight attendant panel
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An amber "BUS OFF" light is:
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Extinguished when the corresponding GEN bus is powered
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What is the maximum engine generator electrical load limit?
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125 amps
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What is the minimum battery voltage for an APU start?
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23 volts
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When a CSD LOW OIL PRESSURE or HIGH OIL TEMP light comes on, the system annunciator
and Master Caution lights illuminate |
ELEC
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The __________ light is illuminated when the External AC Bus is powered
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GRD POWER AVAILABLE
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What is the basic AC power distribution? (300/500)
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AC power source to the GEN BUS, GEN BUS supplies its respective MAIN AC BUS and
TRANSFER AC BUS |
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The DRIVE light for an IDG illuminates when (700/800/900)?
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All Answers are correct
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What is the maximum single engine drive generator load for an 800 model aircraft on the ground?
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215 Amps
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When a B737-700 model IDG is operating and the IDG breaker is closed, the IDG output is
connected to |
An AC Transfer Bus
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