Catcher ring arrangement

A blade assembly comprising:

• a hub which is rotatable about an axis;
• at least one blade having an aerofoil portion and a root, wherein the root is coupled to the hub using a primary retention device which prevents radial separation of the root and the hub in normal use;
• and
• a secondary retention device which comprises an annular catcher having a restriction aperture through which the root cannot radially pass, the restriction aperture being located radially outwardly and radially spaced from the root during use, wherein
• the annular catcher comprises at least two sections that abut one another along a parting line, the parting line passing through the restriction aperture,
• the at least two sections are annular rings defining the restriction aperture and at least one additional restriction aperture, and
• the parting line passes through each of the at least one additional restriction aperture.