Primary Flight Display Symbols

Radio Altitude Height

The Radio Height displays RA below 2500 feet. Changes every 10 feet down to 50 feet, then every 5 feet down to 10 feet, then every foot.

If a DH has been entered, the Radio Altitude appears:

  • Green when RA is greater than DH plus 100 feet
  • Amber when RA is less than DH plus 100 feet

If NO is entered as the DH on the PERF APPR page, zero is taken as the default value.

If a DH has not been entered, or an MDA has been entered, the RA value appears:

  • Green when RA is greater than 400 feet
  • Amber when RA is less than or equal to 400 feet