What guidelines must be followed for using alcohol onboard the Envoy 175?

The correct answer highlights the importance of safety and professionalism when it comes to the consumption of alcohol by crew members. Specifically, it states that alcohol is strictly prohibited for crew members within 8 hours of duty. This guideline is crucial because it aligns with safety regulations that aim to ensure that crew members remain alert, responsible, and capable of performing their duties safely.

Adhering to this policy helps prevent any potential impairment that could compromise the safety of both the crew and passengers during flights. It reflects a commitment to aviation standards that prioritize situational awareness and proper decision-making at all times. The prohibition within 8 hours prior to duty is consistent with industry norms, emphasizing that crew members should be in a sober state while on duty to successfully manage any operational challenges they may face.

The other options do not align with the established safety protocols required for crew members when it comes to using alcohol onboard. They either suggest unrestricted access or do not convey the necessary caution that is critical for aviation safety.