What was found
FLT 6537 - IAD-RIC - DURING TAXI OUT, EXPERIENCED A LT DUCT FAIL LIGHT IND. FLT RETURNED TO THE GATE AT IAD. MX CONTROL WAS NOTIFIED OF THE DISCREPANCY AND THE MX PERSONNEL WERE DISPATCHED TO THE A/C FOR TROUBLESHOOTING. THE DISCREPANCY WAS NOTED AS A PROBLEM WITH THE PACK ON THE LT SIDE. PACK WAS DEFERRED IAW THE PROCEDURES AS STATED IN THE J4100 MINIMUM EQUIPMENT LIST UNDER DEFERRED ACTION ITEM 21-8. A/C WAS THEN RELEASED FOR SERVICE. MAINTENANCE CLOSED DMI 08418 ON 9-2-97 BY REMOVING AND REPLACING O-RING ON PACK, OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)