{TAIL ~ A friction damper} provides friction damping for gas turbine engine airfoils to reduce {HEAD ~ vibrations} thereto 
{ TAIL ~ A friction damper } provides friction damping for gas turbine engine airfoils to reduce { HEAD ~ vibrations } thereto
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH