 <unk> was briefly fitted with an aircraft flying @-@ off platform for a <unk> <unk> fighter on <unk> No. 2 in 1927 . It was replaced by a platform on <unk> No. 5 for a <unk> <unk> reconnaissance <unk> in 1928 – 29 . A catapult and a <unk> 4 @-@ <unk> ( 3 @.@ 9 @-@ long @-@ ton ) crane were fitted on the stern during the mid @-@ 1930s modernization , and the ships were equipped to operate three <unk> , although no hangar was provided . The initial Nakajima <unk> <unk> were replaced by Nakajima <unk> <unk> in 1938 . 
