The Andreasson BA-4B is a single-seat aerobatic biplane which was marketed for homebuilding and also produced complete.

The BA-B4B was based on Andreasson's 1944 wooden BA-4 revised to take advantage of more modern construction techniques, such as the use of sheet metal.

[1] It is a single-bay, staggered-wing biplane with fixed tailwheel undercarriage.

P.J.C Phillips acquired worldwide production rights for complete, rather than kit built, version and marketed them in the UK through Crosby Aviation.

[4] Data from Jane's All the World's Aircraft 1974/5[2]General characteristics Performance