What was found
DURING CLIMB-OUT FROM KTOL, THE CREW NOTICE V1=134 NOTICE HESITATION IN AIR SPEED INCREASE AT VR AT 151 AIRSPEED FAILED TO INCREASE IN EXTERNAL MODE. WHEN SWITCH TO STANDBY AIRSPEED INDICATE 220KTS WHICH MATCHED TO FMS SPEEDS. THE CREW RETURNED TO KTOL AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND PITOT STATIC LINE AT DRAIN BROKEN. REPLACED PITOT LINE OPERATIONAL CHECK GOOD IAW DACO DC-8 MAINTENANCE MANUAL 34-12-0, AND ATI JOB CARD 34.12.1. AIRCRAFT WAS RETURNED TO SERVICE.