Aircraft systems

They are designed to move the flight control surfaces or swashplate, allowing the pilot to maintain or change attitude as required.

[1] Landing gear systems for larger aircraft are usually hydraulic for powered retraction/extension of the main legs and doors and also for braking.

Hydraulic systems consist of engine driven pumps, fluid reservoirs, oil coolers, valves and actuators.

[3] The electrical system generally consist of a battery, generator or alternator, switches, circuit breakers and instruments such as voltmeters and ammeters.

Sub-systems include fire detection and protection and thrust reversal.

Aircraft systems include the numerous electronic devices and instruments known as avionics
Aircraft electrical system schematic.