FAA AC 90-23 : 0

1 PURPOSE
2 CANCELLATION
3 INTRODUCTION
4 VORTEX GENERATION
5 VORTEX STRENGTH
6 INDUCED ROLL
7 VORTEX BEHAVIOR
8 VORTEX AVOIDANCE PROCEDURES
9 VORTEX ENCOUNTER GUIDANCE
10 HELICOPTERS
11 PILOT RESPONSIBILITY
12 AIRCRAFT WEIGHT CLASSES
13 ADDITIONAL PILOT CONSIDERATIONS
14 WINGLETS
15 NEXT GENERATION AIR TRANSPORTATION
   SYSTEM (NEXTGEN) WAKE TURBULENCE
   INITIATIVES
APPENDIX 1 - FAA ORDER JO 7110.308, 1.5 NM DEPENDENT
             APPROACHES TO PARALLEL RUNWAYS SPACED
             LESS THAN 2,500 FEET APART
APPENDIX 2 - FAA N JO 7110.608, GUIDANCE FOR THE
             IMPLEMENTATION OF WAKE TURBULENCE
             RECATEGORIZATION SEPARATION STANDARDS
             AT MEMPHIS INTERNATIONAL AIRPORT
APPENDIX 3 - FAA ORDER JO 7110.316, WAKE
             TURBULENCE MITIGATION FOR
             DEPARTURES (WTMD)

Describes basic information on wake vortex behavior, alerts pilots to the hazards of aircraft wake turbulence, and recommends operational procedures to avoid wake turbulence encounters.