A220- Flight Instruments

Question 1

How many DUs have failed for the EICAS reversion mode (REV) to be available?

Answer 1

only when two or more DUs have failed.

Question 2

What is the normal source of air data for the left PFD?

Answer 2

Air Data System Probe 1 (ADSP 1)

Question 3

What is the normal source of air data for the right PFD ?

Answer 3

Air Data System Probe 2 (ADSP 2)

Question 4

What is the normal source of air data for the ISI?

Answer 4

Air Data System Probe 3 (ADSP 3)

Question 5

What is ADSP 4 used for?

Answer 5

ADSP 4 is used in case of an ADSP failure

Question 6

How is the Integrated Standby Instrument (ISI) powered?

Answer 6

The ISI is normally powered by a

DC bus but can be powered by the aircraft battery or Ram Air Turbine (RAT)

Question 7

Above what altitude is the overflight protection function of the weather radar active?

Answer 7

Above 22,000 feet.

Question 8

What is the maximum selectable range of the weather radar?

Answer 8

320 NM

Question 9

How many DUs have to fail for the EICAS Reversion mode (REV) to be available for selection?

Answer 9

The EICAS reversion mode (REV) is available only when two or more DUs have failed.