Gas turbine engine blade containment assembly

A gas turbine engine rotor blade containment assembly comprising a generally cylindrical, or frustoconical metal casing to contain a gas turbine rotor blade in a gas turbine engine rotor blade containment region, the metal casing having an inner surface and an outer surface, at least a portion of the inner surface of the metal casing having a plurality of blind apertures extending into the casing from the surface of the casing to reduce the weight of the casing without impairing the stiffness and penetration resistance of the metal casing.

A gas turbine engine rotor blade containment assembly comprising a generally cylindrical, or frustoconical, metal casing to contain a gas turbine engine rotor blade in a gas turbine engine rotor blade containment region, the metal casing having an inner surface and an outer surface, the metal casing having a flange at an upstream end of the metal casing and a flange at a downstream end of the metal casing, the flanges extending radially outwardly from the outer surface of the metal casing, the metal casing having at least one circumferentially extending rib extending radially outwardly from the outer surface of the metal casing axially between the flanges, the outer surface of the metal casing extending axially between one of the flanges at the upstream end and the downstream end of the metal casing and the at least one circumferentially extending rib being cylindrical, at least a portion of the outer surface of the metal casing between one of the flanges at the upstream end and the downstream end of the metal casing and the at least one circumferentially extending rib having a plurality of blind apertures extending into the metal casing from the outer surface of the metal casing to reduce the weight of the metal casing without impairing the stiffness and penetration resistance of the metal casing.

A gas turbine engine rotor blade containment assembly comprising a generally cylindrical or frustoconical, metal casing to contain a gas turbine engine rotor blade in a gas turbine engine rotor blade containment region, the metal casing having an inner surface and an outer surface, the outer surface of the metal casing extending axially and being cylindrical, or frustoconical, the metal casing having at least two circumferentially extending ribs extending radially outwardly from the outer surface of the metal casing, at least a portion of the outer surface of the metal casing between the two circumferentially extending ribs having a plurality of blind apertures extending into the metal casing from the outer surface of the metal casing to reduce the weight of the metal casing without impairing the stiffness and penetration resistance of the metal casing.