Gas turbine engine

A fan containment system for fitment around an array of radially extending fan blades mounted on a hub in an axial gas turbine engine, the fan containment system comprising:

• a fan case having an annular casing element for encircling an array of fan blades and a hook projecting in a generally radially inward direction from the annular casing element and positioned axially forward of an array of fan blades when the fan containment system is fitted around said fan blades;
• and
• an annular fan track liner comprising a plurality of adjacent arcuate fan track liner panels;
• wherein each fan track liner panel is connected to the fan case at the hook via one or more fasteners configured to permit movement of the fan track liner panel relative to the hook such that the fan track liner panel can pivot towards the annular casing element when a released fan blade impacts the fan track liner panel;
• and
• wherein adjacent sides of two or more of the plurality of adjacent panels engage such that movement of one fan track liner panel towards the annular casing element applies a force to an adjacent fan track liner panel in a direction towards the annular casing element.

A fan containment system for fitment around an array of radially extending fan blades mounted on a hub in an axial gas turbine engine, the fan containment system comprising:

• a fan case having an annular casing element for encircling an array of fan blades and a hook projecting in a generally radially inward direction from the annular casing element and positioned axially forward of an array of fan blades when the fan containment system is fitted around said fan blades;
• and
• an annular fan track liner comprising a plurality of adjacent arcuate fan track liner panels;
• wherein each fan track liner panel is connected to the fan case so as to form a trap door arrangement, such that when a fan blade is released and impacts the fan track liner, the trap door is activated to guide said released fan blade towards the hook;
• and
• wherein at least a portion of the fan track liner panel is angled or curved in a circumferential direction so as to accommodate travel of a released fan blade.