position, and both sockets may rotate in spherical hinges. The guide pins and sockets are structurally aligned with the hydraulic connections of the intermediate circuit of the joint system of thermal regulation. The hydraulic connections of the thermal regulation system have valves which automatically open when they are connected and close when they are disconnected. The force of connection of hydraulic connections is determined by the force of entry of the cylindrical parts, the opening of the valves and the compression of the seal, and their total value does not exceed several hundred newtons. A guide pin and socket structure without hydraulic connections was developed for the APDA. The securing of the pin on the passive assembly from shifting in a radial direction is done automatically during tightening of the ring with the guide protrusions (Figure 3.19); rotation of the sockets insures angular compensation for warping. Figure 3.19. Guide rod with catch (APDA). 1. rod of catch; 2. ring with guides; 3. drive mechanism. The possible jamming of guide pins in sockets with angular compensation should be discussed. Jamming was detected in the final stage of work on the creation of APDAs less than a year before the flight began. When significant lateral forces arise, for example, from the hydraulic shock absorbers during uneven heating, gaps and temperature drops cause the socket to
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