<P> "One Flight Down" is the twentieth episode of the eleventh season of the American television medical drama Grey's Anatomy, and is the 240th episode overall . It aired on April 16, 2015 on ABC in the United States . The episode was written Austin Guzman and directed by David Greenspan . The episode features a plane crash in Seattle bringing patients to Grey Sloan Memorial and old memories of the season 8's tragic plane crash that claimed the lives of Mark Sloan (Eric Dane) and Lexie Grey (Chyler Leigh) back to Meredith Grey, Arizona Robbins and Owen Hunt . </P> <P> A plane crash in downtown Seattle brings a crop of new patients to Grey Sloan Memorial and old memories back to Meredith, Arizona, and Owen . Meredith tries to make it through the day without freaking out about not knowing where Derek is; Bailey gives her a 5: 00 time frame for freaking out . No freaking out until 5: 00 pm . </P> <P> Alex sticks close to Arizona to make sure that she's okay, but she finds him more annoying than helpful . Alex tells Arizona that it was he who cut off her leg, not Callie . When asked, Callie tells Arizona that she was the one to make the call anyway, and she wanted her to have Alex and just be mad at her alone . </P> <P> Owen and Amelia's separation becomes exacerbated when he's reminded of how he "failed his men" when he hired the service of the plane that went down with his doctors on it . Stephanie, who's obsessed with finding love, is determined to make her patient remember the pilot with whom she fell in love . </P>

When does arizona find out karev cut off her leg
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