The FAA’s Advisory Circular (AC) 90-23G, “Aircraft Wake Turbulence,” is the latest edition of the agency’s guidance on this topic, having been revised in February 2014. The new AC, at paragraph 9, “VORTEX ENCOUNTER GUIDANCE,” states in part:
Flight Paths
The FAAs Advisory Circular (AC) 90-23G, Aircraft Wake Turbulence, is the latest edition of the agencys guidance on this topic, having been revised in February 2014. The new AC, at paragraph 9, VORTEX ENCOUNTER GUIDANCE, states in part:
Key Takeaways:
- The FAA's AC 90-23G on aircraft wake turbulence states that encounters are not always hazardous, with severity depending on factors like intercept angle, aircraft weights, and distance.
- The guidance warns of increased induced roll when an encountering aircraft's heading is aligned or parallel with the generating aircraft, and advises avoiding the area below and behind, particularly at low altitudes.
- The current AC primarily addresses scenarios where an aircraft is below or behind a generating aircraft, but does not explicitly cover crossing behind at the same altitude.
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