Glider forced into off-field landing due to severe downdraft

Casualties unknown • Aeródromo de Fuentemilanos (Segovia), ES

A private flight in a Schleicher ASH 25 ended in an off-field landing at Fuentemilanos aerodrome after a sudden loss of altitude prevented the pilot from reaching the runway.

What happened

On May 29, 2022, a private Schleicher ASH 25 glider, registration F-CHAT, was performing a recreational flight originating from Fuentemilanos Aerodrome (LEFM) in Segovia, Spain. The flight, which included one pilot and one passenger, had been underway for several hours. As the aircraft approached the aerodrome for landing, the pilot encountered significant meteorological challenges, including a developing storm system and turbulent conditions.

During the final approach to runway 16, the glider entered a strong downdraft. This sudden loss of altitude prevented the pilot from maintaining the necessary glide path to reach the runway threshold. To avoid an impact with the aerodrome's perimeter fence, the pilot executed an evasive maneuver, steering the aircraft toward an adjacent field approximately 150 meters east of the runway head.

Upon touching down in the field, the aircraft struck a small embankment topped with a barbed-wire fence. The impact caused the rear canopy to break, and the landing gear collapsed. The pilot remained uninjured, but the passenger sustained minor facial injuries from the broken plexiglass and wire.

The investigation

The CIAIAC investigation examined the aircraft's maintenance records, the pilot's experience, and the meteorological conditions at the time of the accident. The investigation confirmed that the aircraft was well-maintained and that the pilot was appropriately licensed and experienced. Investigators also reviewed the flight path and the impact site, noting that the damage to the F-CHAT was consistent with an emergency off-field landing. The investigation also considered the impact of the terrain's undulations, which can create turbulent crosswinds during approaches to runway 16.

Probable cause

The primary cause of the accident was the loss of control during the final approach due to a severe downdraft, which prevented the glider from safely reaching the runway. A contributing factor was the management of the air brakes, as their use increased drag and descent rate during the unstable approach.

Frequently asked questions

What happened in the 2022-05-29 SCHLEICHER modelo ASH-25 accident near Aeródromo de Fuentemilanos (Segovia), ES?

A private flight in a Schleicher ASH 25 ended in an off-field landing at Fuentemilanos aerodrome after a sudden loss of altitude prevented the pilot from reaching the runway.

What aircraft was involved and where did it happen?

The accident on 2022-05-29 involved a SCHLEICHER modelo ASH-25, registration F-CHAT, at Aeródromo de Fuentemilanos (Segovia), ES.

What was the probable cause of the accident?

The primary cause of the accident was the loss of control during the final approach due to a severe downdraft, which prevented the glider from safely reaching the runway. A contributing factor was the management of the air brakes, as their use increased drag and descent rate during the unstable approach.

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