What was found
FLT#816, JFK-SYR. (AIRCRAFT DECLARED AN EMERGENCY AND PERFORMED AN AIR TURN BACK TO JFK) 'AFTER TAKE OFF ACCL THROUGH 250 TO 290 KTS DURING TURNS THE AIRCRAFT WOULD SKID BACK AND FORTH AT A RAPID RATE W/ AP AND WO AP ONLY IN TURNS ALT WAS 5000 CLIMB TO 15000; PERFORMED RUDDER SURFACE TRAVEL CHECK AND CENTERING CHECK. FULL RUDDER DEFLECTION LEFT AND RIGHT 27 DEGREES IAW AMP 27-21-00. PERFORMED RUDDER ACTUATOR INTEGRITY TEST IAW AMP 27-21-01. ALL PARAMETERS WITHIN LIMITS NO DEFECTS NOTED A/C OK TO CONT FOR SVC.'