the B-13L rocket pods, free-fall bombs, KMGU submunition containers, and the SPPU-22-01 gun pods. In a somewhat unconventional manner, the S-52-8307-200 pylons could be mounted on the aircraft, on which the gun pods would be installed in a rearwards-facing manner, pointed downwards at 23°, and fired as the aircraft flew away from ground targets. The first Su-17M3s were unpainted with the silver color from the anodized duralumin. Later Su-17M3s, as well as all variants that followed, was painted with a green camouflage pattern on the top, and blue on the bottom. This camouflage pattern eventually found its way to all Su-17s in service, and the paint jobs were done at repair plants. The camouflage pattern - the locations of the paint dots - was not standardized, thus each aircraft had its own "unique" camouflage. The Su-17M3 would also have a trainer variant designated the Su-17UM3 (see below). Su-17UM (S-52UM) Initial trainer version with the same avionics suite as the Su-17M. The export version was designated Su-22UM3 with R-29 engine, and Su-22UM3K with the AL-21 engine. Manufactured from 1978 to 1982. Su-17UM3 (S-52UM3, "Fitter-G") Revised trainer with the same avionics suite as the Su-17M3. The Su-17UM3 first flew on 21 September 1978 with Yu. A. Yegorov at the controls. The export version was designated Su-22UM3 with R-29 engine, and Su-22UM3K with the AL-21 engine. It was manufactured between 1978 and 1982. Su-17M4 (S-54, "Fitter-K") Final production version with considerably upgraded avionics, including RSDN navigation (similar to LORAN), beacon navigation, inertial navigation, radio compass, and SPO-15LE radar warning receiver. It featured additional fuselage inlets (including a ram-air inlet at the base of the fin) to improve engine cooling airflow, and a fixed air intake shock cone. Many aircraft were equipped for the use of TV-guided missiles and BA-58 Vjuga pod for anti-radiation missiles. The Su-17M4 was equipped with the AL-21F-3 engine, and its export version was designated Su-22M4 (factory S-54K). The Su-17M4 first flew on 19 June 1980 with Yu. A. Yegorov at the controls. The Su-17M4 was manufactured from 1981 to 1988, and the Su-22M4 from 1983 to 1990. The Su-17M4 differed from the Su-17M3 in the removal of the inlet cone control system, which restricted the maximum allowable flight speed to Mach 1.75. The inlet cone housed the more powerful Klyon-54 laser rangefinder. The avionics again differed significantly from the Su-17M4's predecessors - a new A-312 Radikal NP close- and