Aircraft - Accessory drives and mounting pads

Provides a design for quick-release couplings with involute spline drive, intended primarily for aircraft engine/gearbox accessories which require to be removed whilst the engine/gearbox is in service. Comprises design notes and recommendations, accessory flanges up to and above spigot reference 25O, engine/gearbox pads up to and above spigot reference 250, coupling clamps, selected involute splines.