there is no doubt liquids spilling out of an aircraft can cause alarm to those watching the event ......
I do recall a similar question on PPRuNe some time ago .......
"..... lines up ready for takeoff ...... a nice amount of liquid is discharged from below the rear of the fueselage, just before departure ...... what is the liquid?"
and a handfull of clear and positive posts explained all, to everyone's satisfaction ....
