The Chelidon (Χελιδών, meaning 'Swallow' in Greek, also spelled in English as Helithon) was the first airplane developed by the Greek EAF (KEA) aircraft factory with management provided by Blackburn Aircraft Limited at the time.

The development of the Chelidon was completed in the virtually record time of eight weeks, and the first flight was made on 20 February 1927, as a two-seater military biplane designed for advanced training and other roles including reconnaissance and could also be transformed into a hydroplane.

Powered by a 120 hp (89 kW) Salmson 9AC engine, (future variants were to use the Armstrong Siddeley Lynx engine), and had a maximum speed of 150 km/h (93 mph; 81 kn).

[1] An order was originally placed in December 1926, by the Greek Navy, for 18 aircraft but no further production followed, as, after the three-month test flight period, it was considered inferior to alternative proposed models.

Data from KEA Chelidon[2][better source needed]General characteristics Performance