Final answer:
The question is related to aviation obstacle clearance calculations and the impact of temperature on these calculations. It requires filling in missing information regarding when recalculations must be performed, and the correct completion highlights the need for recalculations whenever there is an increase in temperature and obstacle clearance is at a critical threshold or less.
Step-by-step explanation:
The question pertains to the considerations that must be made in aviation, particularly regarding obstacle clearance calculations in relation to temperature changes.
Specifically, the question is asking for the completion of a statement pertaining to the conditions under which obstacle clearance calculations must be re-accomplished.
The complete statement would likely be: "With any increase in temperature, obstacle clearance calculations will be re-accomplished if obstacle clearance is critical or less." It is important for pilots and flight planners to understand that as the temperature increases, the air density decreases, which can affect the performance of the aircraft, including its climb rate and the distance required to clear obstacles during takeoff and landing.
Therefore, obstacle clearance margins may need to be recalculated to ensure safety.