An upgrade to the Sea King AEW.2 / 2A with an improved air and surface radar in a kevlar lined, flexible dustbin which could pivot from horizontal (for landing) to vertical (for operations), was originally to be designated the AEW.7. With the capability of the radar and the requirements of the fleet to include airborne control in its mission, the Airborne Surveillance and Control (ASaC) mk.7 was named.
After valuable and distinguished service as the
Eyes of the Fleet, the final flight from RNAS Culdrose to Fleetlands was on 26 Sep 2018, by XV714, ZA128 and ZE420. This has introduced a further capability gap to the UK Armed Forces, as the replacement system, Crowsnest Merlin, will not be available to protect UK capital ships.