ABSTRACT
The HUD should display data which is compatible with the head-down instruments. It is important that the control strategies used head-up by the pilot be compatible with those used head-down. This does not mean that the HUD must be constrained to show only that data that is shown head-down. It might not be feasible to display all HUD parameters on a head-down electromechanical instrument and would not be wise to limit an electronic HUD to only those parameters available head-down.
