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AIM

10/12/17

7−3−8

Wake Turbulence

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.