A telecommunications panel assembly (10) includes a chassis (14) defining a front (16), a top (20), a bottom (22), and two sides (24) and a plurality of adapter mounting modules (26) mounted to the chassis (14) at the front (16), each adapter mounting module (26) including a plurality of fiber optic adapters (36) mounted in a line. At least one of the adapter mounting modules (26) is mounted to the chassis (14) with a pair of supports (50) that are pivotable with respect to the at least one adapter module (26) such that the at least one adapter module (26) is removable from the chassis (14) and remountable at a position spaced linearly apart from another of the adapter mounting modules (26), wherein all of the adapter mounting modules (26) are also pivotally mounted about horizontal rotation axes (42) extending parallel to the top (20) and bottom (22) and transversely to the sides (24).