This type of RA occurs when the altitude separation at the CPA is not safe. These RA aural advisories tell the flight crew to take corrective action to avoid a possible collision:
· CLIMB - CLIMB. The flight crew must climb at a rate to avoid the preventive up advisory.
· CLIMB CROSSING CLIMB - CLIMB CROSSING CLIMB. The flight crew must climb at a rate to avoid the preventive up advisory. The flight path crosses through the flight path of the threat.
· ADJUST VERTICAL SPEED - ADJUST. The flight crew must reduce the rate of climb to avoid the preventive down advisory.
· DESCEND - DESCEND. The flight crew must descend at a rate to avoid the preventive down advisories.
· DESCEND CROSSING DESCEND - DESCEND CROSSING DESCEND. The flight crew must descend at a rate to avoid the preventive down advisory. The flight path crosses through the flight path of the threat.
· ADJUST VERTICAL SPEED - ADJUST. The flight crew must reduce the rate of descent to avoid the preventive up advisory.