In which situations is continuous ignition required?

Continuous ignition is required during flight in heavy turbulence due to the potential for engine stall or flameout caused by abrupt changes in airflow and pressure on the engine. In turbulent conditions, the engines may experience stress that could impact their performance, and having continuous ignition helps ensure that the engines are maintained in a reliable operating state. This proactive measure provides an additional layer of safety, as it keeps the ignition systems active and ready to react quickly to any abnormal conditions that could arise during heavy turbulence.

While there are critical phases of flight such as takeoff and landing, continuous ignition is not mandated during those stages unless specific conditions are met. For example, the use of anti-ice systems is a scenario where continuous ignition may be suggested to mitigate the risk of ice accumulation affecting engine performance, but it is not a strict requirement like it is during heavy turbulence. In summary, the need for continuous ignition in turbulent conditions is rooted in the necessity for operational reliability and safety in maintaining engine performance during challenging flight circumstances.