What ist the purpose of the sounding pipe valve?

Question

Question Quiz BPL Hot Air - Balloon Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

To indicate the volumetric filling limit.

QuizVDS · Answer

It allows pressure equalization during cruise at high altitude

QuizVDS · Answer

It prevents air from entering the burner system

QuizVDS · Answer

For venting the liquid gas container bottle.

BPL Hot Air: What ist the purpose of the sounding pipe valve? Id: 73