3-9-7. WAKE TURBULENCE SEPARATION FOR INTERSECTION DEPARTURES

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  • 3-9-7. WAKE TURBULENCE SEPARATION FOR INTERSECTION DEPARTURES

    1. Apply the following wake turbulence criteria for intersection departures:
      1. Separate a small aircraft weighing 12,500lbs. or less taking off from an intersection on the same runway (same or opposite direction takeoff) behind a departing small aircraft weighing more than 12,500 lbs. by ensuring that the aircraft does not start takeoff roll until at least 3 minutes after the preceding aircraft has taken off.
      2. Separate a small aircraft taking off from an intersection on the same runway (same or opposite direction takeoff) behind a departing large aircraft (except B757) by ensuring that the aircraft does not start takeoff roll until at least 3 minutes after the preceding aircraft has taken off.
      3. Separate a small aircraft taking off from an intersection (same or opposite direction takeoff) behind a preceding departing B757 aircraft by ensuring that the small aircraft does not start takeoff roll until at least 3 minutes after the B757 has taken off from:
        1. (a) The same runway or a parallel runway separated by lees than 700 feet.
        2. (b) Parallel runways separated by 700 feet or more, or parallel runways separated by 700 feet or more with the runway thresholds offset by 500 feet or more, if projected flight paths will cross.
      4. Separate aircraft departing from an intersection on the same runway (same or opposite direction takeoff), parallel runways separated by less than 2,500 feet, and parallel runways separated by less than 2,500 feet with the runway thresholds offset by 500 feet or more, by ensuring that the aircraft does not start take-off roll until the following intervals exist after the preceding aircraft has taken off:

        NOTE: Apply Para 3-9-6, Same Runway Separation, subparagraph f to parallel runways separated by less than 2,500 feet with runway thresholds offset by less than 500 feet.

        1. (a) Heavy, large, or small behind super - 4 minutes.
        2. (b) Heavy, large, or small behind heavy - 3 minutes.
      5. Inform aircraft when it is necessary to hold in order to provide the required time interval.
        • PHRASEOLOGY
        • HOLD FOR WAKE TURBULENCE.

        NOTE: Aircraft conducting touch-and-go and stop-and-go operations are considered to be departing from an intersection.

    2. The time interval is not required when:
      1. A pilot has initiated a request to deviate from the time intervals contained in subparagraph a1 or a2.

        NOTE: A request for takeoff does not initiate a waiver request; the request for takeoff must be accomplished by a request to deviate from the time interval.

      2. USA NOT APPLICABLE. The intersection is 500 feet or less from the departure point of the preceding aircraft and both aircraft are taking off in the same direction.
      3. Successive touch-and-go or stop-and-go operations are conducted with any aircraft following an aircraft in the pattern that requires wake turbulence separation, or an aircraft departing the same runway that requires wake turbulence separation in accordance with subparagraphs a1, a2, a3, or a4 (except for super aircraft), provided the pilot is maintaining visual separation/spacing behind the preceding aircraft. Issue a wake turbulence cautionary advisory and the position of the larger aircraft.

        NOTE: Not authorized with a Super as the lead or departure aircraft.

      4. If action is initiated to reduce the separation between successive touch-and-go or stop-and-go operations, apply the appropriate separation contained in subparagraph a1, a2, a3, or a4.
    3. When applying the provision of subpara b:
      1. Issue a wake turbulence advisory before clearing the aircraft for takeoff.
      2. Do not clear the intersection departure for an immediate takeoff.
      3. Issue a clearance to permit the trailing aircraft to deviate from course enough to avoid the flight path of the preceding aircraft when applying subpara b1 or b2.
      4. Separation requirements in accordance with Para 3-9-6, Same Runway Separation, must also apply.
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