4 fatalities

Four Killed in Controlled Flight Into Terrain Near Guadarrama (G-BFFS)

Guadarrama, SpainFlight

On December 11, 1977, a Casa 2.111 (registration G-BFFS) operated by Warbirds of Great Britain was involved in an aviation accident near Guadarrama, Spain in flight. 4 people were killed. Investigators recorded the probable cause as: Controlled flight into terrain. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Source recordUpdated 2026-07-04Data APIEditorial standards

An airplane struck a mountain slope near Guadarrama while on a VFR flight from Madrid to Bournemouth-Hurn. All four occupants, including pilot Neil Williams, were killed.

Accident Overview

On an early morning departure from Madrid-Cuatro Vientos Airport, a general aviation airplane was en route to Bournemouth-Hurn, Dorset, with an intermediate stop planned in Burgos. While operating under visual flight rules (VFR) in adverse weather conditions, the aircraft collided with the slope of a mountain near Guadarrama, approximately 50 kilometers northwest of Cuatro Vientos Airport.

Wreckage and Fatalities

The wreckage was discovered near the Puerto de los Leones Pass. All four occupants sustained fatal injuries. The pilot was identified as Neil Williams. The passengers were Mrs. Williams, Joseph Donaghy, and Stephen Parnell.

Probable Cause

The official investigation determined the probable cause to be controlled flight into terrain.

Frequently asked questions

What happened in the 11 Dec 1977 Casa 2.111 accident near Guadarrama, Spain?

An airplane struck a mountain slope near Guadarrama while on a VFR flight from Madrid to Bournemouth-Hurn. All four occupants, including pilot Neil Williams, were killed.

Were there any fatalities in the 11 Dec 1977 Casa 2.111 accident?

The accident was fatal, resulting in 4 fatalities.

What aircraft was involved and where did it happen?

The accident on 11 Dec 1977 involved a Casa 2.111, registration G-BFFS, operated by Warbirds of Great Britain, at Guadarrama, Spain.

What was the probable cause of the accident?

Controlled flight into terrain.