The feasibility of a fireproof two-fluid brake hydraulic system which utilizes nonflammable chlorotrifluoroethylene (CTFE) fluid in a dead ended brake hydraulic system mechanically isolated from the primary MIL-H-5606 hydraulic system was studied. Experimental brake system hardware was designed, built and laboratory tested. Results indicate that the fireproof two-fluid brake hydraulic system concept is feasible, and the basic operation, control characteristics and stability of the brake system are not affected by the two-fluid configuration. The increased density of the CTFE fluid does not cause the hydraulic system to respond slower resulting in longer aircraft stopping distances. However, analysis indicates that the performance lost by changing to the CTFE fluid can be regained by increasing brake hydraulic line sizes and returning the antiskid control box. (Author)


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