The present invention contemplates a multi-airfoil vane segment produced as a single crystal casting from a rhenium containing directionally solidified alloy. The reflection mirror is fabricated by forming a plurality of ribs at a section of the frame and inserting a soft shield plate between the ribs. Validating the data can comprise determining whether any features, structures, or patterns present in the data correlate with actual tubing defects or were caused by a condition unrelated to tubing quality, such as signal noise. The reservoir is defined within the bore by an oil dam and at least one of the spool lands. The controller is configured to maintain the piston in a raised position for a pre-programmed time, after which, the controller allows the piston to fall, by the force of gravity.