The Eurofighter Typhoon is a multi-role strike fighter aircraft, which has recently entered service with the British Royal Air Force. Built by Eurofighter GmbH (Alenia Aeronautica, BAE Systems and EADS), and managed by NETMA, the twin-engine multi-role canard-delta fighter is actually aerodynamically unstable, and totally relies on its quadruplex digital fly-by-wire control system to make the massive amount of minute adjustments necessary to keep it in the sky. No manual system could compensate for its instability, and so the pilot is actually electronically restricted to executing manoeuvres which are possible.