In a Twin Engine Aircraft, which gauge can always confirm an engine failure?

The engine temperature gauge (EGT) is crucial for confirming an engine failure in a twin-engine aircraft because it directly reflects the operational status of each engine. During normal operation, the EGT will indicate temperatures within a specific range that is expected for the engine's performance. If an engine has failed or is not operating correctly, the EGT for that engine will typically show a significant deviation, such as a drop in temperature or an indication outside of normal operating ranges.

This gauge is particularly effective for troubleshooting because it provides immediate feedback on engine performance. A failed engine may be unable to maintain combustion, leading to an abnormal EGT reading. This relation allows pilots to quickly assess if an engine has experienced a failure based on the gauge's response, aiding in both emergency procedures and checklists designed to ensure safety.

In contrast, while other gauges such as the fuel gauge, speed gauge, and airspeed indicator provide important information about the aircraft's overall performance and status, they are not directly indicative of engine performance. A fuel gauge, for example, reflects the amount of fuel available but does not confirm the operational state of either engine. Similarly, the speed gauge and airspeed indicator measure the aircraft's speed relative to the air but do not diagnose individual engine functionality