What is a common result of severe disorientation during flight?

Severe disorientation during flight can lead to a lack of spatial awareness and impaired decision-making abilities for a pilot. Consequently, one of the most dangerous outcomes is controlled flight into terrain. When a pilot is disoriented, they may have difficulty accurately assessing their altitude, position, and orientation relative to the ground. As a result, they may inadvertently fly the aircraft into the terrain without realizing it, thinking they are at a safe altitude or in a stable flight path. This dangerous scenario underscores the importance of maintaining situational awareness and the use of instruments in flying, especially in conditions that can lead to disorientation, such as turbulence, poor visibility, or extended periods without reference to the horizon.

The other options, while potentially relating to flight conditions, do not directly result from severe disorientation. For instance, an increase in altitude or improved airspeed generally results from conscious pilot actions or specific aircraft performance, rather than disorientation. Similarly, fuel efficiency is not directly impacted by disorientation, making it an unrelated consideration in the scenario of severe disorientation during flight.