HD Yak 50 Engine Failure, April 2010, UK

Post major maintenance/life extension at EGMJ a YAK 50 loses oil pressure over the Lake District at 1250ft.

Engine runs until dry before seizing, gearbox u/s and windmilling prop at 3100ft followed by glide, wheels up (no flaps on the 50) into a rough field with an upslope at 500ft amsl.

First impact to full stop 47 metres, first belly impact approx 35 metres.

Aircraft did not go through wall, right aileron did contact with a fence post.

Wind reported at Carlisle less than 5kts - windmills visible not turning and shutdown. Ground soft.

When the engine seized it caused the reduction gearbox to disintegrate hence a windmillling prop and engine shut down with mags off and fuel cut. On inspection the cylinders completely solid, engine core since scrapped.

Camera Contour HD 1080i. Lens 135 degree view

AAIB report:
http://www.aaib.gov.uk/publications/bulletins/august_2010/yak_50__g_yakk.cfm