In heavy rain takeoff, igniters are described as operating with what combination?

• A. High energy high output
• B. Low energy high output
• C. High energy low output
• D. Low energy low output

Answer: (B)

In heavy rain takeoff, ignition reliability is challenged by moisture and droplets that can dampen a single spark. The best approach is to provide many ignition opportunities without delivering a large, high-energy spark each time. A low energy, high output setting does just that: each spark is modest in energy, but the igniter fires repeatedly to increase the chances that the fuel–air mixture will ignite as the engine reaches takeoff conditions. The higher spark rate helps overcome the damp conditions, while the lower energy reduces the risk of arcing or damage in a wet environment. The other options either push too much energy at once or don’t provide enough sparks, making ignition less reliable in rain.