Springed fan track liner

Abstract

A containment system for a gas turbine engine includes a replaceable spring biased fan track assembly for use with a containment case. The fan track assembly includes a body of collapsible material that is positioned within a cavity of the fan case and a spring arrangement provides as system that is operable to perform during normal operating conditions as well as during catastrophic blade failure conditions. In particular, the improved fan track design contemplates a liner that displaces sufficiently at energies less than large foreign object destruction type events.

What is claimed is: 
     
         1 . A fan track liner assembly for a gas turbine engine comprising:
 a tray;   a panel positioned within the tray;   an abradable portion; and   a spring element positioned adjacent the tray.   
     
     
         2 . The fan track liner assembly as claimed in  claim 1 , wherein the assembly is displaceable at energies sufficiently less than energies that are encountered during large foreign object destruction events. 
     
     
         3 . The fan track liner assembly as claimed in  claim 1 , further comprising at least one fastener for securing the assembly to a fan case. 
     
     
         4 . The fan track liner assembly as claimed in  claim 1 , wherein the tray has a lip for engaging a hook of a fan case. 
     
     
         5 . The fan track liner assembly as claimed in  claim 1 , wherein the spring element is a leaf spring, the leaf spring is located near a forward position of the tray. 
     
     
         6 . The fan track liner assembly as claimed in  claim 1 , wherein the spring element is hook-shaped. 
     
     
         7 . The fan track liner assembly as claimed in  claim 6 , further comprising a fastening member for securing the spring element to the tray. 
     
     
         8 . The fan track liner assembly as claimed in  claim 1 , wherein the panel includes a honeycomb core portion. 
     
     
         9 . The fan track liner assembly as claimed in  claim 1 , wherein the panel has a first thickness, and a second thickness, the first thickness is biased by the spring element, the second thickness is positioned adjacent an inside surface of a fan case. 
     
     
         10 . The fan track liner assembly as claimed in  claim 1 , further comprising a fan case, the fan case having a cavity and a fan hook. 
     
     
         11 . A fan track liner assembly for use with a fan containment case for a gas turbine engine comprising:
 a fan track body having a first surface, an inner core and a second surface, the first surface is made of abradable material and is operable to engage a blade member, the inner core is made of collapsible material that is operable to be deformed during a catastrophic condition, the second surface has a profile that is configured to substantially mate with an inside surface of a fan case;   a first mounting member for attaching the fan track body to a fan case; and   a spring positioned between the fan track body and a fan case.   
     
     
         12 . The fan track liner assembly as claimed in  claim 11 , further comprising a fan case for a gas turbine engine. 
     
     
         13 . The fan track liner assembly as claimed in  claim 11 , wherein the fan track body can move from a static position to a partial fan blade release position, and then revert back to a static position, without deforming the inner core. 
     
     
         14 . The fan track liner assembly as claimed in  claim 11 , wherein the second surface of the fan track body is a liner. 
     
     
         15 . The fan track liner assembly as claimed in  claim 11 , further comprising a void between the second surface of the fan track body and a surface of a fan case for a gas turbine engine. 
     
     
         16 . The fan track liner assembly as claimed in  claim 11 , wherein the inner core is a sandwiched between the first surface and the second surface, the inner core comprising:
 a honeycomb core having pockets of open space, and   epoxy located within the pockets of open space.   
     
     
         17 . A fan track liner assembly for use with a fan containment case for a gas turbine engine comprising:
 a fan containment case for a gas turbine engine, the fan containment case including a fan case hook, a cavity, and a mounting member;   a fan track liner having an external profile that is configured to fit substantially within the cavity of the fan containment case;   a void positioned between the fan containment case and the fan track liner; and   a biasing member positioned within the void.   
     
     
         18 . The fan track liner assembly as claimed in  claim 17 , wherein the fan track liner includes an abradable material which is positioned to engage a blade member. 
     
     
         19 . The fan track liner assembly as claimed in  claim 17 , wherein the fan track liner includes a core comprised of deformable material. 
     
     
         20 . The fan track liner assembly as claimed in  claim 17 , wherein the biasing member is connected to one of the fan containment case or the fan track liner, the biasing member is positioned near a forward portion of the fan track liner.