What are the indications of an engine failure during flight in the Warrior PA-28A?

The correct choice highlights key indicators of an engine failure during flight in the Warrior PA-28A. Specifically, loss of power is one of the most obvious signs of engine failure, which directly affects the airplane’s ability to maintain altitude and control. When power is lost, the aircraft will experience a significant yaw tendency towards the inoperative engine due to asymmetrical thrust, especially if the failure occurs while the aircraft is in a multi-engine configuration.

Additionally, a decrease in airspeed is a critical indication of engine failure, as the aircraft will naturally begin to slow down when it loses power. Pilots must recognize this combination of symptoms to effectively diagnose the situation and take timely corrective action, such as executing emergency procedures or finding a landing site.

The other options, while they may describe various mechanical issues or operational anomalies, do not specifically encapsulate the classic indicators associated with engine failure. For instance, increased engine temperature and altitude loss don't definitively pinpoint a failure event; rather, they might arise from other mechanical or operational issues. Similarly, vibrations and changes in fuel flow may indicate a different set of engine problems but are not definitive signs of engine failure in the context meant by the question. Unexpected flaps extension and loss of cabin pressure pertain to different systems