In which situation is it NOT possible to achieve a pressure compensation between the middle ear and the environment?

Question

Question Quiz SPL - Sailplane Pilot License - Human Performance and limitations

QuizVDS · Accepted Answer

The eustachien tube is blocked

QuizVDS · Answer

During a light and slow climb

QuizVDS · Answer

Breathing takes place using the mouth only

QuizVDS · Answer

All windows are completely closed

Id 267 - SPL - In which situation is it NOT possible to achieve a pressure compensation between the middle ear and the environment?