What happened
On January 21, 2010, a Dassault Mystere Falcon, registration G-KPTN, was performing a short positioning flight to London City Airport. During the flight, the aircraft descended below its cleared altitude of 2,000 feet MSL.
The commander mistakenly believed the aircraft was on final approach for Runway 27; however, the aircraft was actually on a downwind leg for Runway 09. After receiving instructions from Air Traffic Control, the crew climbed the aircraft back to its assigned altitude and subsequently landed on Runway 09 without further incident. There were no injuries resulting from this event.
Following the incident, the operator implemented safety measures intended to prevent a recurrence of this error.