Development
A biplane of all-metal construction, with three engines mounted in nacelles between the upper and lower wings, the aircraft was a development of the Breguet S.8/2 Calcutta, which itself was a militarised licenced version of the British Short S.8 Calcutta. It was built to meet a French Navy specification for a long-range flying boat issued in 1932, competing against proposals from Latécoère (the 582), Lioré et Olivier (the unbuilt LeO H42) and Loire Aviation (the Loire 70). The first prototype made its maiden flight on 11 September 1933, with it being purchased (and an order placed for two more on 4 January 1934.
A series of small orders for production Bizertes were placed, starting with an order for three in 1934, with the last order, for 12 (nine of which were later cancelled) being placed in September 1939. In total, 37 Bizertes were built, with the last three not being completed until after the French surrender in June 1940.
In 1935 a civil version - the Breguet Br.530 Saigon - was produced.
Read more about this topic: Breguet 521
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“Sleep hath its own world,
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—George Gordon Noel Byron (1788–1824)