FAA Powerplant Written Practice Test

What describes the maintenance requirements of the breakerless capacitor discharge ignition systems found in most Rotax light sport aircraft engines?

1. Requires frequent inspections

2. Completely maintenance free

3. Needs component replacements every year

4. Requires periodic cleaning

The correct answer is: Completely maintenance free

The breakerless capacitor discharge ignition (CDI) systems, commonly used in many Rotax light sport aircraft engines, are designed to be low maintenance compared to traditional ignition systems. One of the key features of these systems is that they do not have mechanical components that wear out and require regular inspection or servicing, such as points in conventional magneto systems. The engineering of the CDI system allows for improved reliability, as it utilizes electronic circuits that are less susceptible to wear over time. As a result, these systems are often considered maintenance-free under normal operating conditions. This characteristic significantly reduces the routine upkeep that a pilot or maintenance technician would need to perform, leading to a simpler overall maintenance schedule. While factors such as environmental conditions and operational use could warrant periodic checks, the baseline expectation is that these systems do not require regular inspections, component replacements, or cleaning at specified intervals, thereby making them advantageous for light sport aircraft users.