Preventive Action RA

This type of RA occurs when at the closest point of approach (CPA) the present vertical speed results in a safe altitude separation from the threat airplane. When this happens, the aural advisory comes on.

These are the aural messages for the preventive action RA:

· MONITOR VERTICAL SPEED

· MAINTAIN VERTICAL SPEED, MAINTAIN

· MAINTAIN VERTICAL SPEED, CROSSSING MAINTAIN.

The preventive action RA messages tell the flight crew to do these things:

· Maintain the flight path

· Do not fly into the area of RA pitch symbol on the ADI

· Maintain the vertical speed rate.