VSD Messages

Under certain conditions, some messages may appear in conjunction with others:
Table 26: VSD Messages

Message

Description

‘Loading…’

VSD is loading data due to a range change, full/ half switch, or first being selected for display.

‘Flight Plan Not Available’

Flight Plan mode is selected and there is not a flight plan loaded with at least one leg.

‘Ownship Position Unknown’

Flight Plan mode is selected and the ownship's position is unknown or cannot be accurately placed on the VSD

'GPS Altitude Fail'

Track mode is selected and GPS altitude has been lost.

‘VSD Not Available’

At least one of the following is true:
  • Valid terrain database not available

  • Current barometric altitude not available

  • Current heading is not available

  • GPS position not available

  • An invalid range error has occurred

190-03123-21 Rev A
July 2026