What was found
KHA - FLT 827 - ATL-TOL - IN CLIMB, THE FLIGHT CREW NOTICED THE 'A' SYSTEM HYDRAULIC QUANTITY WAS DROPPING. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO ATL. AN UNEVENTFUL LANDING WAS MADE. INVESTIGATION REVEALED THAT THE LOWER RUDDER POWER PACK WAS LEAKING HYDRAULIC FLUID DUE TO A LOOSE PRESSURE SWITCH. THE SWITCH WAS RETORQUED AND LEAK CHECKED. THE AIRCRAFT WAS RETURNED TO SERVICE (M)