Display Selector
IRS Mode Selector Unit
ATT –

Provides only attitude and heading information:

  • Attitude information is invalid (attitude flag in view) until
    ALIGN light is extinguished.

  • Heading information is invalid (heading flags in view)
    until the actual magnetic heading is manually entered
    and the ALIGN light is extinguished.

  • Position and ground speed information is not available
    until the IRS is aligned on the ground.

  • The selector must be cycled to OFF before reselecting
    ALIGN or NAV.