When would you use a FEVER check?

Using a FEVER check is particularly important when there is a suspicion of an engine malfunction or fire. The FEVER check, which stands for Flaps, Engine instruments, Vg (airspeed), Engine instruments (again), and Runway, serves to quickly evaluate the status of the aircraft and its response in critical situations. In the event of an engine issue, executing a FEVER check helps pilots systematically assess vital indicators that can confirm whether an engine malfunction is in progress and if immediate action is required, such as initiating emergency procedures or preparing for a landing.

The FEVER check is not relevant for assessing cabin pressure, checking fuel levels before landing, or evaluating autopilot functionality, since these scenarios require different procedures and checks that do not involve the same sequence of prioritizing engine-related parameters and aircraft handling.