During a flight, what is a common signal of an engine failure?

A sudden decrease in speed and loss of power is a common signal of an engine failure because it directly indicates that the engine is not producing the thrust required for sustained flight. When an engine fails or begins to fail, the aircraft will experience a noticeable reduction in thrust, which leads to a rapid decrease in speed. Pilots are trained to recognize these symptoms as potential indicators of an engine malfunction.

In addition, the inability to maintain proper power levels can lead to a stall if the pilot does not react quickly and appropriately. Understanding these signs enables pilots to take necessary corrective actions or perform emergency procedures, ensuring better safety and handling during such critical situations.

The other options do not represent typical symptoms associated with an engine failure. While increased altitude may be a response to other flight conditions, it does not relate directly to engine failure. Unusual cabin pressure and excessive fuel consumption are indicators of different issues that are not specifically connected to engine failure events.