| 摘要 |
FIELD: aircraft control systems. SUBSTANCE: proposed combination drive has main distributor spool on which additional bead is made which is arranged inside bore of backup spool provided with two eccentric recesses arranged at a distance of 180° and forming two closed spaces. One space is constantly connected with rain line, and outer is connected by means of electrohydraulic valve installed in drive with delivery line, when valve is cut in, and with drain line, when valve is cut out. Invention provides possibility of checking serviceability of backup spool of drive distributor at preflight checking action and issuing information to pilot on fact of change over for operation from said spool. EFFECT: improved reliability in operation. 1 dwg
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