I don' t agree with all. Note I'm not sure at all, and perhaps try to make standart in a period of test in the VVS is an error...
furthermore, the normative we can find can't be applied to all the planes.
anyway, it's important to try to make a chronology of thid period paint
1) 1927/1937
(I allways put 1927 because I saw that in your classification Massimo, but what did really happens in 1927 ?)
Upper surfaces color: dark green, according to konstantin: "Protective" green was dark, moss green (some Spanish modellers say it was similar to RLM 83)
under surfaces color: we have a really evidence (thanks to Konstantin) with the stratostate URSS-1 (altitude rcord baloon) wich is kept in MAE in Paris. This was done in the factory 23, the same who used to make the Polikarpov planes (I-16 type 5 for exemple)
the metalic part of the polikarpov have to be painted in this color, and we can think that protective color for the fabric was close to it...
the nose are painted in black in the I-15 and the I-16 (but the pics I saw of polikarpov RZ in Spain are not)
wheels were paint in black too in the I-15 ant the I-16
2) 1938 / 1940
it's the most complicated period.
The I-15 bis
upper surface AIIz for fabric
under surface AII alu for fabrisc and AE-9 for metal parts (grey blue)
The I-153
All AIIalu for metal parts and AE-9 for metalic part
the I-16
AIIz for upper surface
pale blue who quickly turned to light grey (in zavoy 21 no AII alu was used according to Orlov)
Alex a Rusian friend of mine, traduce me some part of the Orlov paper about the prewar VVS paints.
next message some Orlov paper element, but I have to go know ...
Xan
in febrery of 1937 a, general Alexandrov signed the Circular
Alex a russian friend of mine gave the official deceret name an date, but I don't find it... it was in the late 1937...