the avionics of the t-4 are digital in nature; this approach was chosen in order to reduce both the size and weight of the avionics while also increasing their reliability. typically, these systems and components have been indigenously produced, albeit with the incorporation of some base technologies from several american industries; examples of this include the inertial guidance system, which uses honeywell-built laser gyroscopes, while the air data computer uses sperry-supplied transducers. the majority of onboard systems are of a conventional nature; however, according to flight international, the use of a licensed onboard oxygen generation system (obogs) is an unusual choice for a trainer aircraft and had required considerable effort to adapt it for use aboard the t-4. a british-sourced artificial feel system is also used by the type, the components for which being locally manufactured.