"VERTICAL VELOCITY INDICATOR, SINGLE SCALE, SINGLE POINTER; SCALE: 0-100FEET PER MINUTE; PANEL MOUNTED; FUNCTION: DISPLAYS RATE OF ASCENT/DESCENT TOPILOT; NVIS MODIFIED VERSION OF NSN 6610-00-804-6312; MODIFIED BY GRUMMAN SOURCE CONTROL DRAWING 160C180241; MADE FROM AAU-9/A"