Various accessories powered by an aircraft's power plant:

 Various accessories powered by an aircraft's power plant:

Category	Accessory	Function
Electrical Systems	Generator/Alternator	Provides electrical power for the aircraft's systems and equipment.
	Batteries	Stores electrical energy for starting engines and emergency power supply.
	Inverters	Converts DC to AC power for AC systems.
Hydraulic Systems	Hydraulic Pumps	Powers landing gear, flight controls, brakes, and flaps.
Pneumatic Systems	Bleed Air System	Supplies pressurized air for cabin pressurization, air conditioning, and anti-icing systems.
Fuel Systems	Fuel Pumps	Transfers fuel from tanks to the engines.
Environmental Systems	Air Conditioning Compressors	Regulates cabin temperature and ventilation.
	Cabin Pressurization System	Maintains breathable air pressure in the cabin.
De-Icing/Anti-Icing	Engine Anti-Icing System	Prevents ice formation on engine inlets.
	Wing and Tail Anti-Icing System	Prevents ice accumulation on critical surfaces.
Engine Control Systems	Engine-Driven Accessories	Includes fuel control units, thrust reversers, and variable geometry controls.
Navigation and Avionics	Gyroscopic Instruments	Receives power for navigation and attitude control.
	Radar and Communication Systems	Powered for situational awareness and communication.
Starting Systems	Starter Motor	Engages the engine to initiate rotation during start-up.
Cooling Systems	Oil Cooling System	Cools the engine oil to maintain safe operating temperatures.

This list encompasses the most common accessories, though specific configurations may vary by aircraft type and model.