Which information is not required to be consulted before flight?

In aviation, a thorough pre-flight briefing is essential for ensuring safety and operational efficiency. While weather conditions are critical and must be assessed prior to flight, the maximum altitude, site surveyed area, and fuel or energy sufficiency are also key elements of flight preparation.

The maximum altitude is important for determining the airspace you will be operating in and ensuring compliance with regulatory limits. The site surveyed area involves understanding the terrain and any obstacles in the vicinity of your planned flight path, which can affect safety. Fuel or energy sufficiency ensures that the aircraft can complete the intended flight safely without running out of fuel.

However, while weather conditions must always be evaluated due to their direct impact on flying safety and operational capability, there are instances where pre-flighting can continue with incomplete or enhanced assessments of weather, particularly if one is operating under certain visual flight rules (VFR) where the flight conditions seem suitable without pursuing formal or comprehensive weather reports. Thus, it is not strictly necessary to consult weather conditions every single time if a pilot has sufficient experience and situational awareness.