An aircraft avionics bay provided with at least one shelf (4) that includes: a support platform (5); retention seats (12) for a rack-mountable electrical module (6) each including a module connector (14); an external connection interface (7); an interconnection platform (9) extending substantially parallel to the support platform (5), on the side opposite the retention seats (12), the interconnection platform (9) supporting conductive connection tracks (28); a plurality of rear printed circuits (15), each rear printed circuit (15) extending opposite a module connector (14); the conductive connection tracks (28) of the interconnection platform (9) extending into each rear printed circuit (15) and to the external connection interface (7) via flexible conductors (18, 19).