mputed.) June 28, 1990. Gulfstream•Aexospace Corp. Model G-IV, s/n 1085, 688GA, Aircraft Type Certificate Data Sheet Al2EA. Refer to: FAA APPROVED Gullstream Aerospace Corp.-(GAC) optional Aircraft Service Change (ABC) No. 131 subject: LIGHTING (ATA-33), TAXI LIGHT POSITIVE CONTROL-MODIFICATEON,.dated February 26, 1990. she