EoN Olympia 460 structural failure during flight near Parham, Sussex resulting in fatality
On July 2, 1989, an EoN Olympia 460 experienced a structural failure during a flight near Parham, Sussex, resulting in the fatality of the pilot. The glider was seen entering a series of uncontrolled dives before the left wing separated at a low altitude. The aircraft was destroyed upon impact in dense woodland. Investigations revealed no interference with controls and confirmed that the center of gravity was within limits. The pilot's harness was found unlocked, and ground tests suggested the possibility of the pilot sliding through the harness during the dive.
- Cruise thermaling flight: After an aerotow launch at 1145 hrs, the pilot cruised and soared locally for about three hours in good conditions near Parham.
- Sudden nose-down pitch: While in a gentle right turn at about 3000 feet agl, the glider abruptly pitched violently nose-down to well past the vertical.
- Aft CG and sensitive pitch: The aircraft type was known to be sensitive in pitch, with this flight’s centre of gravity towards the aft limit, increasing susceptibility to pitch disturbances.
- Loose harness fit: Post-accident tests in a similar aircraft showed that with the harness adjusted as found, a small pilot could slide through the loose straps in a vertical attitude, forcing the control column forward and losing effective control.
- Uncontrolled vertical dives: From around 2000 feet agl the glider remained near-vertical in a high-speed dive, with three brief, unsuccessful pitch-up attempts that did not achieve a sustained recovery.
- Left wing structural failure: At an estimated 500 feet agl, during the third brief pitch-up, the left wing suffered a torsional and downward bending overload failure and separated in flight at roughly 600–800 feet.
- Crash - fatal: The fuselage and remaining right wing continued almost vertically down and impacted dense woodland, destroying the glider and fatally injuring the pilot.