Wake turbulence on departures

AlphaAlpha Newcomer In the sand

Aircraft 1/heavy departs from an intersection and the intersection is more than 500 feet from the approach end.

Aircraft 2/heavy departs from the approach end.

Is there wake turbulance seperation?

atcguruaf Rico Suave AZ

yes. (10 characters)

atcguruaf Rico Suave AZ

okay, sorry for the short answer.... here's the long one:

The wake turbulence separation is 2 minutes OR 4 miles. I've heard the other argument that you're probably talking about. HOWEVER:

The .65 states to separate an aircraft taking off from an intersection.... behind an aircraft taking off from runway (number), I interpret this as full length because it doesn't state intersection.

My point being is that it never states that the heavy, large, or small plus, is departing from an intersection. given that, MY interpretation is that if the departure point is behind the heavy, you apply 2 minutes or 4 miles.

Not to mention 1-1-1 (I know, it's my favorite section), since it doesn't state that the heavier aircraft is departing from an intersection, I use my best judgement - MEANING : I apply the 2 minutes or 4/5 miles if the aircraft is departing from behind the heavy's departure point.

mad1dizzle Rookie

3 mins non waiverable when involving heavy.

atcguruaf Rico Suave AZ

CH. 3-9-3

f. Separate IFR/VFR aircraft taking off behind a heavy jet/B757 departure by 2 minutes, when departing... (you can read the rest for yourself, but trust me, it's there)



the answer to your question is 2 minutes. Aircraft 2 is departing behind aircraft 1.

mad1dizzle Rookie

Correct... I miss read the initial question

garlandatc Junior Member

Little confused! Saw the post and the question. Looks like the question is ? what is the separation requirement for full length heavy departure behind heavy intersection departure (>500ft) on the same runway? The separation requirement is 3 min non-waiver-able and no action can be taken to reduce the 3 min rule. Ie 4 miles radar separation may not be applied. Maybe I missed the question. Pretty sure its 3-9-8 but not a quote- Let me know.

P_to_the_R Ruler of the Movement Area funkytown

the three minute wake turbulence stuff is if the intersection departure is following the full length departure

atcguruaf Rico Suave AZ

it's two minutes, not 3. Radar separation may be applied.

garlandatc Junior Member

Concur! Thanks for the correction.