Mock Oral Flashcards
(85 cards)
How would service employees get lights to service the aircraft?
External service button on the AC service panel
Where is the AC service panel located?
Forward right fuselage
What bus does the AC service switchlight power?
AC service bus
What kind of things are on the AC service bus?
Lights
Water & waste control
What does the DC service switch get power from and what does it power?
APU Battery Direct Bus
Service bus
What does the AC & DC service switches power?
AC & DC service buses
Which buses are always powered (hot)?
APU Battery Direct Bus
Main Battery Direct Bus
Emergency Bus
What are ways the AC system can be powered?
IDG
APU
ADG
AC External Power
What happens when I switch the battery master on?
The BATT BUS is powered by the APU Battery Direct Bus & the Main Battery Direct Buses. The DC system is turned on
What other switches on the aircraft can control DC systems?
None. The DC system is taken care of by DCPCs
What are the two ways the DC system is powered?
Main & APU Batteries
TRUs (this is the long term way it will be powered)
What buses power the TRUs?
AC Bus 1
AC Bus 2
AC Bus 2
AC ESS Bus
What controls all of the bus ties?
DCPC
In default the cross ties are all ____.
Closed because they are all powered by the TRUs.
If AC Bus 1 failed, which tie would open?
Main tie
Utility bus would be depowered
The ____ will automatically control the ties to optimize power to the DC system.
DCPCs
If we lost all AC power what would happen?
ADG would deploy
Would the ADG power the DC system?
Yes because the AC ESS Bus is powered, so that TRU will convert it to DC. The ESS tie will connect it to the BATT BUS
AVAIL on the AC Service switchlight means we have the correct voltage, frequency, and phase from
The AC external power
What’s the sequence of events on the AC Service switchlight?
AVAIL will illuminate when we have the correct voltage, frequency, and phase (115V, 400HZ, 3 Phase). Then you hit the button for the AC external power to become IN USE.
If we had AC External power IN USE and we turn on the APU, what would be powering the airplane?
The APU because it’s priority (onside, inside, cross side, outside)
With GEN 1 & the APU on, what is powering what buses?
GEN 1 is powering BUS 1 & the APU is powering BUS 2
What are the components of an IDG?
Constant speed drive & a generator
When would we press a guarded switchlight?
When directed by the QRH