When is continuous ignition required during flight?

Continuous ignition is required during flight specifically for takeoff and landing on contaminated runways. This practice is put in place to ensure that in the event of an engine failure or if the engine encounters a condition that might lead to a flameout—such as ice, snow, or water on the runway—there is a constant source of ignition. It significantly enhances the safety of the flight by allowing for an immediate response to issues that may arise during critical phases of flight, particularly when the aircraft is operating in potentially challenging conditions.

During takeoff and landing, the aircraft is operating at lower speeds and altitudes, which can make it more vulnerable to engine performance issues. Contaminated runways can introduce risks that affect engine operation, making continuous ignition an important safety measure during these phases. In contrast, during normal cruising in clear weather, and especially during emergencies, the requirements for continuous ignition differ based on the situation, and thus do not warrant the same level of precaution as takeoff and landing on problematic runways.