emergency turn

[MD83FO]

Good morning,

Where does the term emergency turn come from with respect to EOSID?
I can't find the term in the american continent.

[Journey Man]

OEI Departure Procedure?

Advisory Circular 120-91 (http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC120-91.pdf)

[MD83FO]

lovely thanks