If primary flight information is lost on the MFDs, which source can be referenced for airspeed, attitude, and heading?

If primary flight information is lost on the MFDs, which source can be referenced for airspeed, attitude, and heading?

• A. SFI
• B. EICAS
• C. MFDs
• D. CDU

Answer: (A)

When the primary flight information on the MFDs is lost, you turn to the Standby Flight Instrument. This standalone set of instruments provides the essential flight data needed to fly safely: attitude from the standby attitude indicator, airspeed from the standby airspeed indicator, and heading from the standby heading indicator. It is designed to remain powered and functional even if the MFDs go down, using its own power source and separate sensors. The other options don’t fit because EICAS is a systems/engine status display and doesn’t reliably provide direct flight data; the MFDs themselves are the source of the loss; and the CDU is a control/input unit, not a source of primary flight data.

When the primary flight information on the MFDs is lost, you turn to the Standby Flight Instrument. This standalone set of instruments provides the essential flight data needed to fly safely: attitude from the standby attitude indicator, airspeed from the standby airspeed indicator, and heading from the standby heading indicator. It is designed to remain powered and functional even if the MFDs go down, using its own power source and separate sensors. The other options don’t fit because EICAS is a systems/engine status display and doesn’t reliably provide direct flight data; the MFDs themselves are the source of the loss; and the CDU is a control/input unit, not a source of primary flight data.