1 fatality

Test flight crash near Toulouse due to reversed aileron cables (F-BATM)

Toulouse-Blagnac, FranceTakeoff (climb)

On November 23, 1948, a SNCASE SE.161 Languedoc (registration F-BATM) operated by Air France was involved in an aviation accident near Toulouse-Blagnac, France during takeoff. One person was killed. Investigators recorded the probable cause as: The aileron control cables were installed in reverse, causing inverted control response during takeoff. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Source recordUpdated 2026-08-24Data APIEditorial standards

A four-engine aircraft crashed shortly after takeoff from Toulouse-Blagnac during a test flight. The pilot died two days later from injuries sustained while evacuating the burning wreckage.

What happened

The incident occurred during a scheduled test flight departing Toulouse-Blagnac Airport with a destination of Montauban. As the aircraft lifted off and entered the initial climb phase, it suddenly lost control. The machine crashed to the ground and caught fire immediately.

All five individuals on board managed to leave the cabin despite the intense flames. However, one occupant suffered severe injuries after falling onto an engine that was still burning. This individual succumbed to their wounds two days later in a medical facility.

Findings

Investigations into the accident revealed a critical mechanical error as the root cause. It was determined that the ailerons control cables were connected in reverse. This inversion meant that pilot inputs produced opposite aerodynamic responses, leading to the loss of control during the critical climb phase.

Probable cause

The aileron control cables were installed in reverse, causing inverted control response during takeoff.

Frequently asked questions

What happened in the 23 Nov 1948 SNCASE SE.161 Languedoc accident near Toulouse-Blagnac, France?

A four-engine aircraft crashed shortly after takeoff from Toulouse-Blagnac during a test flight. The pilot died two days later from injuries sustained while evacuating the burning wreckage.

Were there any fatalities in the 23 Nov 1948 SNCASE SE.161 Languedoc accident?

The accident was fatal, resulting in 1 fatality.

What aircraft was involved and where did it happen?

The accident on 23 Nov 1948 involved a SNCASE SE.161 Languedoc, registration F-BATM, operated by Air France, at Toulouse-Blagnac, France.

What was the probable cause of the accident?

The aileron control cables were installed in reverse, causing inverted control response during takeoff.