What are the 3 conditions when wake turbulence is greatest?

Since the turbulence from a “dirty” aircraft configuration hastens wake decay, the greatest vortex strength occurs when the generating aircraft is HEAVY, CLEAN, and SLOW. In rare instances, a wake encounter could cause catastrophic inflight structural damage to an aircraft.



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Wake turbulence categories
  • Light (L) — aircraft types of 7,000 kg or less.
  • Medium (M) — aircraft types more than 7,000 kg but less than 136,000 kg; and.
  • Heavy (H) — all aircraft types of 136 000 kg or more, with the exception of aircraft types in Super (J) category; and.


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These distances apply when one aircraft is operating directly behind (within 1/2 NM laterally) another, or is crossing behind, at the same level and up to 1000 feet below. In this same situation when the separation will be less than 2 minutes, radar controllers should issue a caution of possible wake turbulence.

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Rough air happens everywhere, from ground level to far above cruising altitude. But the most common turbulence experienced by flyers has three common causes: mountains, jet streams, and storms.

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AVOID THE AREA BELOW AND BEHIND THE WAKE GENERATING AIRCRAFT, ESPECIALLY AT LOW ALTITUDE WHERE EVEN A MOMENTARY WAKE ENCOUNTER COULD BE CATASTROPHIC. A common scenario for a wake encounter is in terminal airspace after accepting clearance for a visual approach behind landing traffic.

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On Monday 3 March 1997 at 1014 hours, privately owned and operated Cessna 185 encountered wake turbulence from previous departing aircraft, the pilot lost control of the aircraft at a height from which recovery was not possible and the aircraft descended to the ground.

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If severe turbulence is encountered, simultaneously reduce power and adjust pitch until aircraft approaches maneuvering speed, then adjust power and trim to maintain maneuvering speed and fly away from the turbulent area.

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To summarise those points in terms of enroute wake avoidance, and effect limitation:
  1. Fly above their path.
  2. Position yourself upwind away from the wake path.
  3. Try to be at least 3 minutes behind the aircraft when crossing the path.
  4. And cross perpendicular to the wake path, to avoid inducing a roll.


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Pilots review en-route conditions before departure, which include turbulence charts. This, alongside checking with center controllers about ride conditions while in the air, helps inform pilots about the flight conditions. Unlike other forms of turbulence, wake turbulence is predictable.

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Wake turbulence poses a major risk to other aircraft, so pilots and ATC use the term “heavy” in radio transmissions as a reminder that the aircraft's wake may be dangerous to others passing behind or below the flightpath of these larger-mass aircraft.

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