Continuous ignition must be on during which condition?

• A. Takeoff/Landing on Contaminated Runways
• B. Normal Cruise in Good Weather
• C. Climb in Smooth Air
• D. Descent with Idle Thrust

Answer: (A)

Continuous ignition helps prevent an engine flameout during phases when the engine is under sudden load and exposure to contaminants is more likely. On a contaminated runway, takeoff and landing expose the engine to possible water, slush, ice, or debris ingestion and rapid thrust changes, which raise the risk of flameout or surge. Keeping the igniters on provides a readily available spark and ignition source to relight quickly if a flameout occurs, and it supports stable operation during the demanding transitions of takeoff and touchdown. Therefore, continuous ignition should be used during takeoff and landing on contaminated runways.