 The carriers' primary anti-aircraft (AA) armament consisted of eight twin-gun mounts equipped with 40-caliber 12.7-centimeter (5 in) Type 89 dual-purpose guns mounted on projecting sponsons, grouped into pairs fore and aft on each side of the hull. The guns had a range of 14,700 meters (16,100 yd), and a ceiling of 9,440 meters (30,970 ft) at an elevation of + 90 degrees. Their maximum rate of fire was fourteen rounds a minute, but their sustained rate of fire was around eight rounds per minute. The ship was equipped with four Type 94 fire-control directors to control the 12.7 cm guns, one for each pair of guns, although the director on the island could control all of the Type 89 guns.
