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Aeronautical Information Manual (AIM), page 526

Index   525 -- Page 526 -- 527



NOTE-
Controllers may not reduce or waive these intervals.
b. A 3-minute interval will be provided when a
small aircraft will takeoff:

1. From an intersection on the same runway
(same or opposite direction) behind a departing large
aircraft (except B757), or
2. In the opposite direction on the same runway
behind a large aircraft (except B757) takeoff or
low/missed approach.

NOTE-
This 3-minute interval may be waived upon specific pilot

request.
c. A 3-minute interval will be provided when a
small aircraft will takeoff:

1. From an intersection on the same runway
(same or opposite direction) behind a departing
B757, or

2. In the opposite direction on the same runway
behind a B757 takeoff or low/missed approach.
NOTE-
This 3-minute interval may not be waived.


d. A 4-minute interval will be provided for all
aircraft taking off behind a super aircraft, and a
3-minute interval will be provided for all aircraft
taking off behind a heavy aircraft when the operations
are as described in subparagraphs b1 and b2 above,
and are conducted on either the same runway or
parallel runways separated by less than 2,500 feet.
Controllers may not reduce or waive this interval.

e. Pilots may request additional separation (i.e.,
2 minutes instead of 4 or 5 miles) for wake turbulence
avoidance. This request should be made as soon as
practical on ground control and at least before taxiing

onto the runway.

NOTE-
14 CFR Section 91.3(a) states: "The pilot-in-command of
an aircraft is directly responsible for and is the final
authority as to the operation of that aircraft."

f. Controllers may anticipate separation and need
not withhold a takeoff clearance for an aircraft
departing behind a large, heavy, or super aircraft if
there is reasonable assurance the required separation
will exist when the departing aircraft starts takeoff
roll.


7-3-8 Wake Turbulence

Page 526 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   525 -- Page 526 -- 527