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About the RECAT

Wake Turbulence Re-categorization, or Wake RECAT, is the safe decrease in separation standards between certain aircraft.


The continuing growth of aviation increases demands on airspace capacity therefore emphasizing the need for optimum utilization of available airspace. Improved operational efficiency derives from the application of different Wake Turbulence Separation techniques, as direct factor influencing decrease of delay.
There are two Wake Turbulence Separation minima, one is based on four Wake Turbulence Categories (Super, Heavy, Medium, Light). This is the legacy Wake Turbulence Separation with its legacy Wake Turbulence Separation minima. The second set of applicable provisions is based wake turbulence groups (A, B, C, D, E, F, G), taking into account on wake generation and resistance characteristics of the aircraft. These depend primarily on maximum certificated take-off mass, wing characteristics and speeds and is called enhanced Wake Turbulence Separation.

Safety Assessment and Monitoring

For the States and appropriate ATS authorities who will transition to ATC operations or trials using enhanced Wake Turbulence Separation minima, local specific safety monitoring activities may be conducted in relation to the deployment safety assessment, with in particular a review and evaluation of the local wake encounter reports for an initial period of operations.
The monitoring of wake turbulence risk should cover the two aspects of the risk: the evolution of the frequency of wake turbulence encounter occurrence and their related severity.
Based on the collected wake turbulence reports shared by States, appropriate ATS authorities or Operators, the ICAO will also proceed with a global review and analysis of related to the operational use of the new enhanced wake minima.

Wake Turbulence Encounter Report

In order to conduct the safety assessment for wake turbulence separation minima by RECAT, Wake Turbulence Encounter Reports should be collected. Information contained in the collected reports shall be used only for safety assessment.
Please refer to the AIP SUPPLEMENT 037/20.

Wake Turbulence Encounter Report Form

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If you have any questions about Wake Turbulence Encounter Report, please contact to the e-mail address or phone number.

<JASMA desk>
Flight Procedures and Airspace Program Office,
Air Navigation Services Department, Civil Aviation Bureau
TEL: +81-3-5253-8750
FAX: +81-3-5253-1664

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