Which subsystem is included as an accessory system in a gas turbine?

• A. Starting and ignition systems.
• B. Primary cooling loop only.
• C. Exterior aesthetics.
• D. Hydraulic powerpack.

Answer: (A)

Accessory systems are the supportive gear outside the main gas-path that let the engine start and operate. The starting system provides the initial rotation to bring the compressor to speed, and the ignition system supplies the spark or flame to ignite the fuel–air mixture once the engine is turning. Without these two, the core cycle can’t begin, so they’re classic examples of an accessory subsystem. Exterior aesthetics isn’t involved in engine function. The primary cooling loop handles heat removal and is part of the engine’s thermal management rather than an accessory in this context. A hydraulic powerpack is another type of accessory that supplies hydraulic power, but the starting and ignition combination is the most representative example of an accessory system in this framing.