Where are the reference speeds, MDA, DH, and barometric altimeter settings entered?

• A. Digital Flight Guidance System
• B. Air Data Reference Panel (APR)
• C. Overhead Control Panel
• D. Standby Instrument Panel

Answer: (B)

Setting these values happens on the Air Data Reference Panel. This panel is where you input the reference speeds used for approach and landing, as well as the altitude constraints for an instrument approach (MDA for non-precision approaches and DH for precision approaches). You also enter the barometric altimeter setting here, so the air data computer can compute correct altitude readings and display them accurately.

The Air Data Reference Panel feeds this data to the flight guidance and display systems, ensuring the aircraft uses the right speeds and altitude constraints during approaches. Other panels aren’t used to enter these data: the Digital Flight Guidance System handles guidance logic, which relies on data from the APR; the Overhead Control Panel houses system controls; and the Standby Instrument Panel is a backup display, not a data-entry panel.