Electrical System Flashcards
A good battery should supply power to the hot battery bus and the emergency bus for approx.?
30 minutes
The cross feed bus serves as a tie for
Bus tie for the hot battery bus, emergency bus3d and the feed buses
In flight, with generators online, the battery is isolated from any charging source when the BATT switch is in…
When in EMER or OFF position
If manual termination of a start sequence is desired, the switch to press is….
START DISG
The voltage read on the voltmeter with VOLTAGE SEL switch in BATT is sensed from the…
Hot battery bus
If the generators are not operating, the voltmeter reads batter voltage when the BATT switch is in…
In BATT or EMER position
The light in each engine start button illuminates to indicate…
The closing of the start relay
The generator filed relay opens when… (3 items)
- an internal feeder fault is sensed
- an overvoltage condition is sensed
- an ENG FIRE switch light is activated
If a battery start is intended, the generator switches should be placed to…
GEN
With the battery as the only source of power and the BATT switch to OFF, the bus(es) powered is (are)…
Hot battery bus
With the battery as the only source of power and the BATT switch in EMER, the following bus(es) are powered…
Emergency bus and hot battery bus
With the battery as the only source of power and the BATT switch in BATT, the following condition exists…
All DC buses are powered for max 10 minutes
The item that receives power directly from the hot battery bus is…
Nose baggage compartment light, besides ELT, voltmeter and emergency battery pack
In flight, an engine start accomplished with the start button (not a windmilling start) is a….
Is a battery start as the generator assist is disabled in flight to protect the operating generator
Regarding the engine start sequence (battery start on the ground), when is it terminated….
It is terminated normally by 45% N2 speed sensing switch on the starter generator
Which of the following statements is correct or not correct:
- the illumination of the engine START DISG button is a function of the panel lights control NIGHT DIM switch
- the generator switchs are placed in the OFF position for an EPU start
- a failed left 225 amp current limiter prevents starting of the left engine
All are correct
With the electrical system operating normally (both generators on the line with the BATT switch in BATT) what function has the GCU (Generator Control Unit)….
The GCU serve to automatically regulate, parallel, and protect the generators
Placing the BATT switch in EMER with the generator on the line… which point is correct or not….
A) causes loss of power to the emergency bus since the generators are on the line
B) causes the emergency bus to be powered by the battery
C) still provides charging power to the battery
D) should result in the battery voltage remaining at 29 volts
Only B is correct
Loss of both generators, what is happening on the anunciator panel…
- R and L GEN OFF anunciators
- MASTER CAUTION RESET light on
- MASTER WARNING RESET light on
During engine start, the speed sensing switch terminates the start sequence this removing power from the… (3 items)
- electric fuel boost pump
- ignitors
- starter generator
The BATT OTEMP anunciator comes on steady and remains steady after the MASTER WARNING RESET switch light is depressed, first step to do…
Move BATT switch to EMER and observe volts and amps
Both engines are started and the AFY J-BOX LMT anunciator is illuminated, what has happened….
A 225 amp current limiter is blown and must be repaired before flight
The BATT DISCONNECT switch is used for what…. (3 items)
- for start stuck relay
- for stuck battery relay during battery over temperature
- can only be used when BATT switch is in BATT
