Aircraft Mounted Accessory Gear Box (AMAGB) is a critical Line Replacement Unit (LRU) and forms a very important part of Secondary Power System (SPS) of LCATejas. AMAGB was first time designed and developed in the country with important technical features, such as, lightweight, compact, high speed, single input and multioutput gearbox of aeronautical standards. The gearbox has self-contained lubrication system which ensure the safe functioning of the gearbox.