Un document en anglais, édité par la British Gliding Association (BGA), présente le risque de "plongeon vertical" de l'avion remorqueur en raison de la position incorrecte du planeur
Four tug pilots have been killed since 1974 from tug upsets while aerotowing. Six tug upset incidents were reported in 2012. This leaflet offers advice to the glider pilot on safe aerotowing and in particular the avoidance of tug upsets.
https://members.gliding.co.uk/wp-content/uploads/sites/3/2015/05/Formatted-Final-online.pdf