What was found
NR 1 ENGINE COMPRESSOR STALLED 4 TIMES CLIMBING THROUGH 15,500 FT. AFTER COMPRESSOR STALL, WITH SAME THROTTLE ANGLE, NR 1 ENG N1 WAS 98.4 PERCENT WHILE NR 2 WAS 104 PERCENT. ALL OTHER PRIMARY ENGINE PARAMETERS WERE FLUCTUATING. WHEN THE NR 1 THRUST LEVER WAS RETARDED TO FLT IDLE THE COMPRESSOR STALL CEASED AND NORMAL FLIGHT IDLE PARAMETERS WERE NOTED. AIRCRAFT LANDED WITHOUT INCIDENT.