At this link is a great article on orchestral etiquette that applies to all sections of a professional orchestra.
When you're still in school and in a student orchestra, you are more likely to be in a situation where asking questions as a non-principal is OK and even encouraged. In a professional setting, it is indeed the case that speaking out is not appropriate. All of the suggestions in the article are the normal expectation for orchestra rehearsals and concerts.
These are a great reminders to me even though I've played professionally for years. It's easy to develop funny little habits that may be annoying or inappropriate, and it's a good to re-examine the rules before this season starts again.
Link: Orchestral Etiquette by The Entire DSO Flute Section (Flute Specialists July 2015 Newsletter)