A220- Electrical

Question 1

What happens when the e CABIN PWR switch light is pressed?

Answer 1

The CABIN PWR switchlight will remove power from cockpit outlets and selected
cabin systems, such as the galleys and in‐flight entertainment systems.

Question 2

What would cause the BATT

DISCHARGING caution message to display?

Answer 2

If the aircraft is powered with batteries only for longer than 5 minutes, the BATT
DISCHARGING caution message displays on the EICAS. A horn also sounds until AC power is
available, or batteries are switched OFF.

Question 3

When does the Ram Air Turbine (RAT) deploy automatically?

Answer 3

In the event of a complete loss of AC power, the RAT deploys automatically and provides both
emergency electrical and hydraulic power.

Question 4

The RAT supplies electrical power at
aircraft speeds of _______ KIAS or more and
hydraulic power at speeds as low as_______ KIAS.

Answer 4

• 148 KIAS

* 115 KIAS

Question 5

What provides the aircraft with DC power?

Answer 5

• Three transformer rectifier units (TRUs)

* Two Nickel Cadmium (NiCad) batteries.