page_title: Accessory drive
section_title: Components
hierarchical_section_title: Accessory drive / Components
caption_attribution_description: Rolls-Royce Turbomeca Adour Mk811 displayed at HAL Museum.
context_page_description: The accessory drive is a gearbox that forms part of a gas turbine engine. Although not part of the engine's core, it drives the accessories, fuel pumps etc., that are otherwise essential for the operation of the engine or the aircraft on which it is mounted. Accessory drives on large engines handle between 400–500 hp.
context_section_description: Power for the accessory drive is taken from the central shaft linking the turbine and compressor sections of the engine. This requires an internal gearbox that couples the drive to a radial driveshaft or towershaft that drives an external gearbox.
caption: Turbomeca Adour, with the accessory drive mounted beneath. The accessories are removed and their mounting flanges covered by bright red blanking plugs.
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