SYSTEM FOR CONTROL OF EXTENDING AND RETRACTING LANDING GEAR OF FLYING VEHICLE Russian patent published in 1995 - IPC

FIELD: aviation. SUBSTANCE: system is provided with hydraulic cylinders 3 and 5 of undercarriage legs and well doors and the following components which are engageable with them: limit switches 17-19; hydraulic distributors 1 and 2 with electric drives 13 and 14, supply and return hydraulic lines 7 and 8, hydraulic locks 23 and 24 of undercarriage leg, slaving valves 21, 25 and 26 one of which (21) is engageable with door and other two are used to connect chambers of hydraulic cylinders 3 of undercarriage leg and hydraulic locks 23 and 24 with outlet of hydraulic distributor 1 to which inlet of slaving valve 21 is also connected; outlet is connected to inlets of valves 25 and 26; mechanically linked with undercarriage leg is additional slaving valve 27 which is used to connect chambers of hydraulic cylinders 3 of undercarriage leg and hydraulic lock 23 with supply line 7, with the landing gear in the retracted position. During operation of the system, when undercarriage leg is extended, valve 27 operates admitting pressure to hydraulic cylinder 3 of undercarriage leg past hydraulic lock and hydraulic lock 23 of retracted position of undercarriage leg which is retained till stop of flying vehicle engine, thus ensuring higher reliability of operation of the system. EFFECT: enhanced reliability. 1 dwg