A liner system for a fan casing of a turbine engine, the liner system comprising: a fan track liner panel (32, 132, 232) positionable axially within the casing arranged around a rotatable fan and forming a blade containment zone, the fan track liner panel positionable radially outward of the rotatable fan; the fan track liner panel comprising: a body (34, 234) extending a length of the fan track liner panel from a fore portion of the fan track liner panel to an aft portion of the fan track liner panel; the liner system characterised in that the fore portion is divided from the aft portion by a seam (39, 139, 239) in the body to enable the fore portion to separate and move independently from the aft portion during a blade off event; the liner system further characterised in that the aft portion of the fan track liner panel is configured to be directly secured to the casing by a fastener extending through only the aft portion of the body and at least partially through the casing within the blade containment zone such that the aft portion of the fan track liner panel abuts an interior surface of the casing, and the fore portion of the fan track liner panel extends away from the casing to define a cavity between the interior surface of the casing and a surface of the fore portion of the fan track liner panel. a fan track liner panel (32, 132, 232) positionable axially within the casing arranged around a rotatable fan and forming a blade containment zone, the fan track liner panel positionable radially outward of the rotatable fan; the fan track liner panel comprising: a body (34, 234) extending a length of the fan track liner panel from a fore portion of the fan track liner panel to an aft portion of the fan track liner panel; the liner system characterised in that the fore portion is divided from the aft portion by a seam (39, 139, 239) in the body to enable the fore portion to separate and move independently from the aft portion during a blade off event; the liner system further characterised in that the aft portion of the fan track liner panel is configured to be directly secured to the casing by a fastener extending through only the aft portion of the body and at least partially through the casing within the blade containment zone such that the aft portion of the fan track liner panel abuts an interior surface of the casing, and the fore portion of the fan track liner panel extends away from the casing to define a cavity between the interior surface of the casing and a surface of the fore portion of the fan track liner panel. a body (34, 234) extending a length of the fan track liner panel from a fore portion of the fan track liner panel to an aft portion of the fan track liner panel; the liner system characterised in that the fore portion is divided from the aft portion by a seam (39, 139, 239) in the body to enable the fore portion to separate and move independently from the aft portion during a blade off event; the liner system further characterised in that the aft portion of the fan track liner panel is configured to be directly secured to the casing by a fastener extending through only the aft portion of the body and at least partially through the casing within the blade containment zone such that the aft portion of the fan track liner panel abuts an interior surface of the casing, and the fore portion of the fan track liner panel extends away from the casing to define a cavity between the interior surface of the casing and a surface of the fore portion of the fan track liner panel.