If your airspeed is still active, from wind blowing towards you, it may be exceeding the threshold and the HDX won't shut down. This prevents the HDX shutting down while airborne if you lose main ships power.
If your airspeed is still active, from wind blowing towards you, it may be exceeding the threshold and the HDX won't shut down. This prevents the HDX shutting down while airborne if you lose main ships power.