http://www.skybrary.aero/bookshelf/books/160.pdf
Indication of Aircraft Type
For A380-800 aircraft the letter “J” should be entered into the space allocated to wake turbulence under Item 9 of the ICAO flight plan.
For A380-800 aircraft the expression “SUPER” should be included immediately after the aircraft call sign in the initial radiotelephony contact between such aircraft and ATS units.
4. RADAR WAKE TURBULENCE SEPARATION MINIMA
(PANS-ATM 8.7.4.4 and 8.7.4.4.1)
4.1 The following wake turbulence radar separation minima should be applied to aircraft in the approach and departure phases of flight in the circumstances given in 4.2.
Preceding aircraft Succeeding aircraft
Wake turbulence radar separation minima:
A380-800-A380-800 Not required*
A380-800 Non-A380-800 HEAVY 11.1 km (6.0 NM)
A380-800 MEDIUM 13 km (7.0 NM)
A380-800 LIGHT 14.8 km (8.0 NM)
*When a wake turbulence restriction is not required then separation reverts
to radar separation minimum as prescribed by the appropriate ATS
authority. The recommendation of the ad hoc group (safety case) indicated
that no wake constraint exists for the A380-800 either following another
A380-800 or a non-A380-800 HEAVY aircraft.
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SKYbrary - Wake Vortex Turbulence
En route
ATC traffic separation standards in controlled airspace will not necessarily prevent significant encounters with wake turbulence and the greater risk of injury because both Cabin Crew and some passengers will probably not be secured in their seats. However, it is unlikely that any loss of control will be more than very brief and easy recover from if at least minimum ATC separation standards are maintained.
The only available direct defence against occupant injuries is for the flight crew to maintain
situational awareness by monitoring other traffic in the vicinity by listening out on RTF and by use of the
TCAS Display and then use the seat belt sign and direct communication with Cabin Crew to temporarily secure all occupants if in-train climbing or one-level-above traffic is observed up to 10 nm ahead and confirmed with ATC as being a significantly larger aircraft type.
ATC awareness of the persistence of wake turbulence at en route altitudes beyond reqired traffic separation minima is sometimes poor.