Which hydraulic fluid was developed in the 1960s to address flammability issues?

The hydraulic fluid developed in the 1960s to address flammability issues is MIL-H-83282. This specific hydraulic fluid formulation was designed to provide improved fire resistance, making it safer for use in aircraft systems where the risk of fire could result from hydraulic system failures or leaks. The formulation incorporates either phosphate esters or other non-flammable components to enhance its performance in high-temperature conditions, thereby reducing the likelihood of ignition.

While other hydraulic fluids also serve specific functions, they do not have the same emphasis on reducing flammability risks that MIL-H-83282 offers. For instance, MIL-H-5606 is an older formulation that does not address flammability issues as effectively, making it less suitable for modern aviation applications where safety is a paramount concern. Thus, the development of MIL-H-83282 has greatly contributed to safer hydraulic operation in aircraft.