Cleared Level Alerts

Cleared Level Alert

The Cleared Level alert is triggered when an aircraft is not at, or climbing or descending towards the Cleared Level in the radar label. It will result in an alert acronym (either CL or CLAM depending on the radar system in use) being placed into the label. In some radar systems, the label alert may be acknowledged by centre-clicking.

The incidence of a Cleared Level alert is an indication that either the cleared level entry in the label is incorrect, or that the aircraft is not complying with its level clearance.