Early 80s at TTTE. Student Pilot solo supersonic run (flown at 2000ft over the North Sea), Rather inexperienced Staff Nav in the back.
With wings 45 stude selects reheat and electric jet leaps forward , (clean jet, no tanks, no pylons). As speed winds through about 550 kt, Nav calls:
“Check Wingsweep!”
In response Stude grabs WS lever and moves it the wrong way, selecting 25 wing instead of 67. Jet instantly climbs about 1500ft.
Slightly bent jet flown carefully back to base, Staff Nav ruminating on choice of words.