ed service reply card indicating this ASC was previously complied with. ASC Airframe ASC 78 Potable Water System Purge. SiN 5001.5192 970780 Plackard excluding 5014,5037,5044,5069, 5132,5188,5189,5191. Concurrent requirement CB 71. ASC ASC 79 Main landing Gear 970790 Emergency Line Modific