2−1−20.WAKE TURBULENCE CAUTIONARY ADVISORIES a.Issue wake turbulence cautionary advisories and the position, altitude if known, and direction of flight of the heavy jet or B757 to: REFERENCE− AC 90−23, Aircraft Wake Turbulence, Pilot Responsibility, Para 12. 1.TERMINAL. VFR aircraft not being radar vectored but are behind heavy jets or B757s. 2.IFR aircraft that accept a visual approach or visual separation. REFERENCE− FAAO JO 7110.65, Para 7−4−1, Visual Approach. 3.TERMINAL. VFR arriving aircraft that have previously been radar vectored and the vectoring has been discontinued. b.Issue cautionary information to any aircraft if in your opinion, wake turbulence may have an adverse effect on it. When traffic is known to be a heavy aircraft, include the word heavy in the description. NOTE− Wake turbulence may be encountered by aircraft in flight as well as when operating on the airport movement area. Because wake turbulence is unpredictable, the controller is not responsible for anticipating its existence or effect. Although not mandatory during ground operations, controllers may use the words jet blast, propwash, or rotorwash, in lieu of wake turbulence, when issuing a caution advisory. REFERENCE− AC 90−23, Aircraft Wake Turbulence. P/CG Term− Aircraft Classes. P/CG Term− Wake Turbulence. PHRASEOLOGY− CAUTION WAKE TURBULENCE (traffic information). REFERENCE− FAAO JO 7110.65, Para 7−2−1, Visual Separation
So no unless in your opinion wake turb could be a factor.
however, there is a stipulation that "in your opinion" a WT advisory is warranted then issue it. in the radar world, if something smaller is following something bigger than I issue it. is this stupid in certain situations? absolutely. although i do it anyway.
ie. S behind S+, S+ behind L, L behind 757/heavy, anything behind a super heavy.
I know this is in chapter 3, but what is your guys interpretation on this..
3−10−3. SAME RUNWAY SEPARATION
b. Issue wake turbulence advisories, and the position, altitude if known, and the direction of flight of:
1. The heavy jet/B757 to aircraft landing behind a departing/arriving heavy jet/B757 on the same or parallel runways separated by less than 2,500 feet.
2.The large aircraft to a small aircraft landing behind a departing/arriving large aircraft on the same or parallel runways separated by less than 2,500 feet.
As a tower controller I have to issue a CWT according the above rule.