***Meaning*** :: <u>I</u>nversion; <u>C</u>oriolis; <u>E</u>levator; <u>F</u>alse Horizons; <u>L</u>eans; <u>A</u>utokinesis; <u>G</u>raveyard <u>S</u>piral; <u>G</u>raveyard Spin; <u>S</u>omatogravic ***Additional Info***: >[!quote] From [[8 Acronyms Every Instrument Pilot Should Know]] >Disorientation is a lead killer of instrument pilots. Avoid these illusions by relying on your instruments! > - [[Inversion Illusion]] (Climb to straight and level = Tumbling backwards feeling) > - [[Coriolis Illusion]] (Head movements in prolonged turns) > - [[Elevator Illusion]] (Updraft/Downdraft causes a pilot to pitch up or down) > - [[False Horizon]] (Sloping clouds, terrain, etc) > - [[The Leans]] (Banking illusion that occurs by relying on physical sensations rather than instrumentation) > - [[Autokinesis]] (Stationary lights appear to move) > - [[Graveyard Spiral]] (Constant rate turn downwards) > - [[Graveyard Spin]] (Pilot recovers from spin but senses they are in a new spin, so re-enter that spin) > - [[Somatogravic Illusion]] (Caused by rapid acceleration or deceleration that results in a pitch up or down) ***Related To***: [[Illusions Leading to Spatial Disorientation]] #acronym #illusions