Please, explain what does mean AYF in the sentence (about Gloster Javelin):
"In addition with A.I. equipment Gee, A.Y.F., I.L.S. and I.F.F. were fitted".
Can't find this abbreviation.
Thank you in advance,
"In addition with A.I. equipment Gee, A.Y.F., I.L.S. and I.F.F. were fitted".
Can't find this abbreviation.
Thank you in advance,