Electrical Power Flashcards
What do we check before turning the Aircraft Power Supply off?
ADIRUs, Emergency Light S/W etc. must be turned off
What is the purpose of Static Inverter (SI)?
Converts DC to AC
What is the purpose of Transformer Rectifier Unit (TRU)?
Converts AC to DC
What is the purpose of the HOT BAT BUS?
It is directly connected to the battery and all the users connected will always have
power available
Who supplies the AC ESS BUS?
AC BUS 1
When the AC BUS 1 is broken, who supplies the AC ESS BUS?
AC BUS 2 through the AC
ESSENTIAL FEED
When our GEN 1 is broken who supplies our AC ESS BUS?
It still the AC BUS 1 but the source comes from GEN 2 by passing through AC BUS TIE
When does the Emergency Generator operates?
When no other generators (normal power source) is available during flight
Who operates the Emergency Generator?
Ram Air Turbine (RAT)
When only the EMER GEN power source is
available, what buses is the only ones left
operating?
AC and DC ESS BUS
How do we charge the batteries of the Aircraft?
Is only possible when power is supplied by the generators and the battery S/W is turned on
What are the GCU functions?
Regulation, Protection, Switching
What are the parameters does the GCU regulates?
Frequency and Voltage
How do we increase the voltage by GCU?
Exciter Current
What does it mean when the AVAIL light is
on in the cockpit?
The EPU is connected to the aircraft
and it is ready to use.
What does it mean when the NOT IN USE light is on in the control panel below the
aircraft?
The EPU is connected but the EXT PWR P/B S/W is not pressed by the pilot
What is the meaning of IDG at its purpose?
Integrated Drive Generator and it is a combination of Constant Speed Drive (CSD)
+ Generator
Four types of AC Consumers?
FIRST – Single Phase (115V) Consumer with
low power demand.
SECOND – Single Phase Consumers that needs a different voltage (28V or 26V) by
using Step down Transformers
THIRD – Three Phase Consumers such as 3 phase motors and TRU and all needs to operate at the same time
FOURTH – Large load that need about 50% of the total electrical load
What do we do to the Large Loads consumers when there’s a power outage?
Shed
Shed is done by?
Automatically or Manually