TyphoonOlga kills 51MANILA. ThePhilippine* lt;AP * - A major flood control dike collapsed in Pampanga province early today and the army ordered evacuation of 50. 000 persons living along the flooded Pampanga Kiver Pour more deaths were reported, raising the toll since last Thursday from Typhoon (Mga to 51. the Ked ('rows saidA flood control station in the province 40 miles northof Manila reported flood waters rising two feet per hour,The home defense centerin Pampanga appealed lorU S amphibious vehicles from ( lark Air Base 30miles to the west and forPhilippine air forcehelicopters to helpevacuate residentsThe governor of NuevaEcija province, north erfPampanga. reported 24 towns under water and anestimated to.otw persons stranded in t.a Pax Military helicopters flew food rescue missions Floods resulting from Olga's rains covered other parts of central Luzon, the major rice producing area erf the PhilippinesOlga, now a tropical storm, lingered in northern Luxon Meanwhile, typhoon Pamela, which caused widespread destruction on Guam,changed course today and weathermen in Tokyo predicted it would miss Japan Pamela was re ported east of two Jima, heading northeast