What is the role of ignition exciters in aircraft gas turbine engines, and how can their failure be detected?

• A. They regulate fuel flow to the combustor during start and have no direct indication of failure.
• B. They monitor turbine temperature and adjust ignition timing automatically.
• C. They provide high-energy sparks to ignite fuel; failure indicated by missing spark on start or fault indicators; tested with squibs or bench tests.
• D. They lubricate the ignition system components to prevent corrosion.

Answer: (C)