Patent ID: 8393436

Claim:
For use in an aircraft environmental control system, a flexible muffler comprising: a pair of duct connectors; an inner sleeve formed into a cylinder having a single length-wise seam and defining a first outer surface and formed of a sound pervious material having opposed ends joined to said duct connectors and defining a muffler passage therethrough; a first helix of reinforcing cord wound solely upon and adhesively joined adhesively to said first outer surface of said inner sleeve; a layer of acoustic absorptive material upon said inner sleeve and said first helix of reinforcing cord; an outer sleeve formed into a cylinder having a single length-wise seam and defining a second outer surface and formed of an air impervious material having opposed ends joined to said duct connectors and forming a seal therewith; and a second helix of reinforcing cord wound solely upon and adhesively joined solely to said second outer surface outer sleeve, said inner and outer sleeves and said first and second helixes of reinforcing cord cooperating to maintain said muffler passage in an open state when said flexible muffler is flexed or bent.