A vane arc segment comprising: an airfoil fairing having first and second fairing platforms and a hollow airfoil section extending there between; a spar having a spar platform adjacent the first fairing platform and a spar leg that extends from the spar platform and through the hollow airfoil section , the spar leg having an end portion that is distal from the first fairing platform and that protrudes from the second fairing platform , the end portion having a clevis mount ; a support platform adjacent the second fairing platform , the support platform having a first through-hole , the end portion of the spar leg extending through the first through-hole such that the clevis mount protrudes from the support platform ; and a pin extending through the clevis mount and locking the support platform to the spar leg such that the airfoil fairing is trapped between the spar platform and the support platform , the pin having ends that abut a face of the support platform , the support platform having a second through-hole : the support platform having a tendency to rotate about the pin under the aerodynamic load (AL) received from the airfoil fairing ; and the vane arc segment further comprising: a stabilizer rod extending through the second through-hole of the support platform and through the hollow airfoil section , the stabilizer rod limiting rotation of the support platform about the pin , wherein the stabilizer rod includes first and second ends , the first end has a head that is engaged with the support platform at the second through-hole , and the second end is attached to the spar platform . an airfoil fairing having first and second fairing platforms and a hollow airfoil section extending there between; a spar having a spar platform adjacent the first fairing platform and a spar leg that extends from the spar platform and through the hollow airfoil section , the spar leg having an end portion that is distal from the first fairing platform and that protrudes from the second fairing platform , the end portion having a clevis mount ; a support platform adjacent the second fairing platform , the support platform having a first through-hole , the end portion of the spar leg extending through the first through-hole such that the clevis mount protrudes from the support platform ; and a pin extending through the clevis mount and locking the support platform to the spar leg such that the airfoil fairing is trapped between the spar platform and the support platform , the pin having ends that abut a face of the support platform , the support platform having a second through-hole : the support platform having a tendency to rotate about the pin under the aerodynamic load (AL) received from the airfoil fairing ; and the vane arc segment further comprising: a stabilizer rod extending through the second through-hole of the support platform and through the hollow airfoil section , the stabilizer rod limiting rotation of the support platform about the pin , wherein the stabilizer rod includes first and second ends , the first end has a head that is engaged with the support platform at the second through-hole , and the second end is attached to the spar platform . <EOS>