Electrical Systems Flashcards
The IDG’s provide what type of electrical power?
AC
An engine can be started without AC power.
True
Sources of AC power include:
- GPU
- RAT
- IDGs
- APU
The TRU’s convert DC to AC power.
False
The hot battery bus can power certain items when the airplane is powered down. What items are powered?
- Fueling panel
- Engine fire fighting
When should crews start the APU during normal operations?
10 minutes prior to pushback or as necessary for passenger comfort.
In case of total AC power loss in flight
the RAT should automatically deploy and provide limited AC power.
The E-175 has what types of circuit breakers?
Thermal and Electronic
What is the minimum battery voltage for normal operation?
22.5 volts
The OFF selection on the IDG selector mechanically disconnects it from the associated engine.
False
What provides power to the DC ESS Buses when no AC power source is available?
Two 24V SLABs (Sealed Lead Acid Batteries)
What would you do if you discovered a battery at 20.5 volts upon power up?
Call maintenance
After starting the left engine with the APU on, what generator will power AC BUS 2? (Right engine is not running)
APU
Sources of DC power include:
- Battery
- GPU
How many TRUs does the ERJ 175 have?
3
