One of the most popular passenger aircraft in 30's. It was very economical and easy to
maintain. The only imported parts were landing gear chromium-molibdenium axis. It differed from its predecessors
K-4) by dual controls, more powerful engine
M-17F) and (later) strengthened airframe.
First 100 production K-5 were powered by l.c. M-15, but it was unreliable and
resulted in frequent emergency landings. Since 1930 a.c.
M-22 was installed. It was very reliable, but flight characteristics slightly degraded
due to larger drag. This aircraft was presented on State Acceptance trials (May 26 - June 26,
1932). 550 takeoffs/landings and 2000 sharp turns were performed without a
trouble, but aircraft was rejected for low payload capacity.
In 1933 installation of powerful l.c.
M-17F resulted in wing leading edge collapse (during flight tests) due to increased
speed and weight. Problem was fixed by replacing (or strengthening) the wing on aircraft with this engine. Weight was increased,
resulting in decrease in payload or range.
260 K-5 were built during
1930-1934, replacing German
aircraft on Ukrainian airlines.
In service as a major passenger aircraft until 1940.