Altitude Separation

The TCAS computer calculates the altitude separation between own airplane and the target. It uses the barometric altitudes of the airplanes to do this. The altitude separation shows on the ND in hundreds of feet. If the traffic is above, the digits show above the traffic symbol with a plus (+) sign. If the traffic is below, the digits show below the traffic symbol with a minus (-) sign.

If the altitude separation is less than 100 feet, 00 shows.

If the altitude separation cannot be calculated, the altitude

display does not show.

Absolute Altitude

The target sends barometric altitude to the TCAS computer. This altitude shows in thousands and hundreds of feet. If the traffic is above, the digits show above the traffic symbol. If the traffic is below, the digits show below the traffic.

If the altitude cannot be calculated, the altitude display does not show.

Vertical Motion Arrow

A vertical motion arrow shows on the right side of the traffic symbol. It is the same color as the traffic symbol.

The arrow points down if the traffic airplane goes down at a rate more than or equal to 500 fpm. The arrow points up if the traffic airplane is in a climb at a rate more than or equal to 500 fpm. The arrow does not show for rates less than 500 fpm.