Malaysia Airlines Flight 370

=== Unresponsive crew or hypoxia ===
An analysis by the ATSB comparing the evidence available for Flight 370 with three categories of accidents—an in-flight upset (e.g., [[Stall (fluid mechanics)#Aerodynamic description of a stall|stall]]), a [[Gliding flight|glide event]] (e.g., engine failure, fuel exhaustion), and an [[Uncontrolled decompression#Gradual decompression|unresponsive crew or hypoxia event]]—concluded that an unresponsive crew or hypoxia event "best fit the available evidence" for the five-hour period of the flight as it travelled south over the Indian Ocean without communication or significant deviations in its track,<ref name=ATSB />{{rp|34}} likely on autopilot.<ref name=Reuters-26June /><ref name=WSJ-26June /> No consensus exists among investigators on the unresponsive crew or hypoxia theory.<ref name=NYT-hypoxia>{{cite news|last1=Bradsher|first1=Keith|title=Pressure Loss Is Explored in Vanishing of Jetliner|url=https://www.nytimes.com/2014/06/27/world/asia/malaysia-airlines-flight-370.html|access-date=29 June 2014|work=[[The New York Times]]|date=27 June 2014|archive-date=29 June 2014|archive-url=https://web.archive.org/web/20140629041010/http://www.nytimes.com/2014/06/27/world/asia/malaysia-airlines-flight-370.html|url-status=live}}</ref> If no control inputs were made following flameout and the disengagement of autopilot, the aircraft would likely have entered a [[spiral dive]]<ref name=ATSB />{{rp|33}} and entered the ocean within {{convert|20|nmi|km mi|abbr=on}} of the flameout and disengagement of autopilot.<ref name=ATSB />{{rp|35}}<!-- at this point the report refers to an inflight upset followed by loss of control, which in the case of Flight 370 would mean flameout and the disengagement of autopilot -->

The analysis of the flaperon showed that the landing flaps were not extended, supporting the spiral dive at high speed theory.<ref>{{cite news |url=http://edition.cnn.com/2016/11/02/asia/mh370-crash-landing-report/index.html |title=MH370 out of control and spiraling fast before crash, report says |work=[[CNN]] |last=Westcott |first=Ben |date=3 November 2016 |access-date=7 July 2017 |archive-date=30 July 2017 |archive-url=https://web.archive.org/web/20170730061918/http://edition.cnn.com/2016/11/02/asia/mh370-crash-landing-report/index.html |url-status=live }}</ref> In May 2018, the ATSB again asserted that the flight was not in control when it crashed, its spokesperson adding that "We have quite a bit of data to tell us that the aircraft, if it was being controlled at the end, it wasn't very successfully being controlled."<ref name="Uncontrolled Spiral Crash into the Sea">{{cite web |url=https://www.bbc.com/news/world-australia-44216778 |title=MH370 not deliberately crashed by pilot, say investigators |date=22 May 2018 |website=[[BBC News]] |access-date=24 May 2018 |archive-date=24 May 2018 |archive-url=https://web.archive.org/web/20180524073124/http://www.bbc.com/news/world-australia-44216778 |url-status=live }}</ref>