What was found
(CAN) AIRCRAFT WAS IN CLIMBOUT FROM ST.JOHNS AIRPORT, AT 22,000 FEET, AIRSPEED 140 KNOTS, RATE OF CLIMB 1,800 F.P.M., PILOT EXPERIENCED SEVERE BUFFETING TO THE POINT THAT A/C WAS ABOUT TO STALL. STALL WARNING DID NOT ACTIVATE, A/C WAS PLACED IN LEVEL FLIGHT AND BUFFETING STOPPED. A/C RETURNED TO ST. JOHNS FOR MAINTENANCE. UPON INSPECTION MAINTENANCE DISCOVERED THAT THE RIGHT DE-ICER BOOT HAD DETACHED FROM THE HORIZONTAL STABILIZER ON THE OUTBOARD END. NEW DE-ICER BOOTS WRE INSTALLED ON THE LEFT AND RIGHT SIDE, A/C WAS TEST FLOWN ALL FLIGHT CHARACTERISTICS NORMAL.