What does mean AYF?

Бурундук

Бурундук

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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,
 
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Техник

Техник

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I guess its fingertip mistake.
Most likely they meant ADF.
 
Бурундук

Бурундук

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Mechanic, thank you for the interesting link. Yes, it seems it just letter code...