In 2005, the ICAO recommended that provisional separation criteria for the A380 on takeoff and landing be substantially greater than for the 747 because preliminary flight test data suggested a stronger wake turbulence. These criteria were in effect while the ICAO's wake vortex steering group, with representatives from the JAA, Eurocontrol, the FAA, and Airbus, refined its 3-year study of the issue with additional flight testing. In September 2006, the working group presented its first conclusions to the ICAO.
In November 2006, the ICAO issued new interim recommendations. Replacing a blanket 10 nautical miles separation for aircraft trailing an A380 during approach, the new distances were 6 nm, 8 nm, and 10 nm respectively for non-A380 "Heavy", "Medium", and "Light" ICAO aircraft categories. These compared with the 4 nm, 5 nm, and 6 nm spacing applicable to other "Heavy" aircraft. Another A380 following an A380 should maintain a separation of 4 nm. On departure behind an A380, non-A380 "Heavy" aircraft are required to wait two minutes, and "Medium"/"Light" aircraft three minutes for time based operations. The ICAO also recommends that pilots append the term "Super" to the aircraft's callsign when initiating communication with air traffic control, in order to distinguish the A380 from "Heavy" aircraft.
In August 2008, the ICAO issued revised approach separations of 4 nm for Super (another A380), 6 nm for Heavy, 7 nm for medium/small, and 8 nm for light.
source:
http://en.wikipedia.org/wiki/Airbus_A380
