Adhesives conforming to this specification are intended for use in bonding airframe structural components, However, fabricators are required by the procuring activity to obtain approval of the component and of a process specification applicable to the adhesive and component, prior to use of the adhesive on parts procured on contract. Fabrication and inspection must be made in accordance with the requirements of MIL-A-83377. Types I and II adhesives are intended principally for use on aluminum alloys, and types III and IV adhesives are intended principally for use on corrosion-resisting steel alloys or titanium alloys. Use of either on other metals or combination of metals must be substantiated by tests. Parts ' or assemblies requiring the use of adhesives covered by this specification should be designed with Consideration for the heat and pressure required during the bonding operations, The maximum curing pressure specified in 3.3.3.2 is a necessary requirement for determining the suitability of an adhesive for general production use. However, shop facilities permitting higher pressures in accordance with the manufacturer's instructions may be used whenever practicable.