The Avia B-534-I was a direct variant of the Avia B-34/2 which flew for the first time on 25th May 1933 and was designated retroactively as B-534.1 on September of that same year.
After further testing, an order of 34 airplanes followed which was soon increased to 147 on 17th July 1934.
It was a single-engine biplane fighter powered by a license built Hispano-Suiza inline engine and a fixed landing gear. The first airplane of the I type were delivered for the first time in October 1935 and 100 of them were supplied to the Czechoslovak Air Force.
The I series was based on the second prototype and was armed with four 7.92mm vz.28 guns, two of them placed in the sides of the engine, just like the B-34 and two of them mounted on the lower wings, however, those proved to be troublesome and only the first 47 airplanes were armed with them.
It was powered with an Avia built licenced version of the Hispano-Suiza 12Ydrs engine delivering 850hp of power. It had capacity for 347 litres of fuel which were located in two fuselage tanks of 90 and 257 litres.
Sources:
1. https://en.wikipedia.org/wiki/Avia_B-534
2. Salamander Books - The Complete Book of Fighters
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