Electrical Flashcards
What Display Units normally display when Batteries are set to “On” and “Auto”?
- Display Units 2 and 3 (CA’s MFD / EICAS)
What provides AC power to the aircraft?
- 2 Integrated Drive Generators (IDG)
- Auxiliary Power Unit (APU)
- AC Inverter
- Ram Air Turbine (RAT)
- AC GPU
What provides DC power to the aircraft?
- 2 NiCad batteries
- 3 Transformer Rectifier Units (TRU)
- DC GPU
The IDG(s) are monitored and controlled by what?
- Dedicated Generator Control Unit (GCU)
The amber IDG light(s) will illuminate for?
- High oil temperature
- Low oil pressure
The priority for AC power on the aircraft is?
- Onside (IDG)
- Inside (APU)
- Outside (GPU)
- Cross-Side (other IDG)
How are the aircraft batteries charged?
- An AC power source providing power to the TRU(s)
The batteries should last for how many minutes without being recharged?
- 10 minutes
What is the purpose of the inverter?
- Converts 28 VDC from the batteries to 115 VAC to power the AC
STANDBY BUS when an AC source is not available.
What is powered via the AC STANDBY BUS?
- Engine Exciters 1A and 2A
When will the RAT deploy?
- Main AC BUSSES loss power
- Manually via the RAT Deployment Handle
How long after deployment before the RAT will supply power?
8 seconds
Is there a total loss of power during the 8 second RAT deployment?
- NO, because the Batteries supply power to the DC ESS BUSSES and AC
STANDBY BUS.
What does the RAT directly power?
- AC ESS BUS
What is minimum airspeed that the RAT is capable of providing AC Power?
- 130 kts (load shedding occurs below this speed)
