Final answer:
The Bendix shower of sparks ignition system uses a 5-position ignition switch, aiding engine startup under challenging conditions.
Step-by-step explanation:
The Bendix shower of sparks system utilizes a 5-position ignition switch. This type of ignition system is commonly found in aircraft engines and uses the 5 positions for different engine starting and running operations. These positions typically include off, right magneto on, left magneto on, both magnetos on, and start. In the start position, the system produces a series of sparks to ignite the fuel-air mixture in the cylinders, providing an additional boost during engine start-up in certain conditions, such as in a cold engine or high-altitude starts.