Thanks. From "Klimov's works" site, if you know russian, you can read the detailed description: If not, i'll try to explain it.
"КСА" ("KSA" in latin, word for word translation: "Plane's devices box" or "Plane's aggregates box") is system, what transmits rotatory movement from engine to other devices in plane if engines are turned on (for their (other devices) work) and from outside sources (for example, gas turbine engine ГТДЭ-117 (GTDE-117), which is located on the service car, (look the article earlier)) to plane's engines if it turned off (for start of engines).
KSA also ensures the functioning of hydrosystems and electric systems of the plane.