Clears messages and data from the scratchpad or an individual data field. If alphanumeric characters have been entered into the scratchpad, a single, short press of the key erases the last character entered. A longer press of the key erases the entire scratchpad entry.
When the key is pushed and the scratchpad is empty, CLR appears in the scratchpad. If a line select key is then pressed, the adjacent data field is cleared, or will change to a defaulted or FMGC-calculated value. If the data field to be cleared is a leg in the flight plan, the leg is deleted from the flight plan, and a discontinuity created (in most cases). CLR can be removed from the scratchpad by pushing the key a second time or by entering an alphanumeric character.