Helicopter crash investigation fails to solve mystery.

AIR CRASH investigators say they are still puzzled over why a helicopter was forced to make a crash landing in a field near Flecknoe.

All four people on board survived after the main rotor blades severed the tail pylon during a power failure in mid-air.

Invesigators from the Department of Transport's Air Accident Investigations Branch have just released their findings into the crash, which happened back in July last year, and concluded that they could find no reason for the loss of power.

The 34-year-old pilot had hired the helicopter with three friends…