THERE are two independent hydraulic systems in the aircraft which operate at 3,000 lb./sq. in. (210 kg./cm.2) using OM15 (DTD.585) hydraulic fluid. Identical Vickers Sperry Rand bent‐axis variable delivery engine‐driven pumps are used to power both systems. The pumps arc, however, driven at different speeds so that, at maximum engine speed, 8 gal./min. (36 lit./min.) are available for No. 1 system while 4¾ gal./min. (21 lit./min.) are available for No. 2 system. These two systems are truly independent in that there is no point where oil can transfer from one to the other (see Fig. 1).
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