シーダート
As the first of her class of Royal Navy destroyers, "Sheffield" spent her first years trialling the new systems and the Sea Dart missile system, particularly as the intended Sea Dart trials ship, , suffered serious fires and problems with its steam systems restricting its use in the late 1970s. It was not until 1980 that "Sheffield" became effective, with Sea Dart and partial installation of electronic warfare Abbey Hill systems. Following a refit in the early 1980s, significant design issues with the ship's Type 909 radar (which was responsible for control and targeting of the Sea Dart missiles) were identified. The ship lacked an electronic countermeasures (ECM) jammer.