Electrical Flashcards
What is the primary source of power AC or DC?
What supplies it?
Whats the driving part that allows this to run
AC/
Supplied by two main generators
Driven by the transmission more specically the Accesory module
The APU generator and external power can also supply ac power.
What is a secondary source of ac power, behind the generators.
What the final way we can get AC power to the Aircraft
APU generator
External ac power can also be connected when on the ground.
How much AC power is being outputed by the generators?
How many convertors?
Whats the conversation rate happening
115 Volts // 2 //
Converting 115-volt ac power to 28-volt dc power
A 24-volt dc Nickel-Cadmium (NICAD) battery serves as a secondary source.
How are the AC generators cooled vs the APU gen
AC via the lubercation of XSMN system and the APU gen is air cooled
Each system has its own set of buses.
What is a GCU and what’s it fucntion?
Generator Control Unit (GCU) and it Connects generators to the ac electrical bus,
regulates output,
protects components,
and monitors voltage level and frequency.
How many electrical buses are in the ac side of the house, cool now list them?
Five electrical buses
1&2.) No. 1 and No. 2 ac primary buses,
3.) ac essential bus,
4. AC Secondary bus,
5. AC Monitor bus.
Including No. 1 and No. 2 ac primary buses, ac essential bus, AC Secondary bus, and AC Monitor bus.
What happens when the N r drops below 94 percent with WOW?
The GCU removes the main generator electrical input from the entire ac power distribution system.
What should be done to connect external power to the aircraft electrical bus system?
Toggle the EXT PWR switch to RESET, then ON.
What does the Battery Utility bus receive power from?
The battery regardless of switch position
What does the battery analyzer/conditioner monitor?
Battery system for fault conditions, charge, temperature, and cell conditions.
What happens if both dc converters fail?
(Specfically the Busses)
Both dc primary buses are dropped.
What is the emergency electrical power source if both dc converters fail / Which busses will it charge/ at what point will this source tap out?
The battery
Battery bus and the DC essential bus, 30%
What does the FAULT caution indicate?
Battery overtemperature or cell dissimilarity condition.
True or False: The APU generator is connected (On) to the ac electrical distribution system while both main generators are operating.
False
With WOW, if Nr droops below ____ then GCU removes the main generator from the grid
94% Nr
What is the minimum N r required for the GCU to reconnect generators to the ac electrical distribution system?
97 percent N r
In flight, when will gen undfrequency protection be disabled?
until the Nr decreases to approximately 80 percent.
How many electrical buses are in the DC side of the house, cool now list them?
1.)No. 1 and No. 2 DC Primary buses
2.DC essential Bus
3.Battery Bus
4.Battery Utility Bus
How many volts does the battery produce/ where is it located
24-volt dc battery, located in the copilot seat well,
With an 80% charge, normal battery life is how long for day vs Night
11 minutes vs 9 minutes
At what % will the battery no longer be able to support the Ess Battery bus
Drops below 35%
With no other source of dc power and the battery below a _ % charge, what might I might not be able to avativate now?
30%; activate the fire extinguisher
Cartridge-Actuated Device (CAD).
What limits the AC load to the available generator if one generator should fail?
Automatic bus switching
What is the primary power source of starting the APU?
Battery
What radio is available on battery power?
Number 1 radio
What are the 2 things that will trigger a battery fault?
Over temp
* Cell dissimilarity
