Air Accidents Investigation Branch
Whilst the aircraft was in the cruise at 2,000 ft agl, there was a loud bang as the right engine failed. The aircraft landed without further incident at Bournemouth. The engine failure was because the Number 2 cylinder had detached from the crankcase. This was caused by a fatigue failure of the cylinder flange attachment studs. It is likely that fatigue was initiated by a loss of preload in three of the studs at the front of the cylinder creating the conditions for the remaining studs and through-bolts to subsequently fail. The reason for the loss of preload could not be determined.