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ATR-72 crash at PKR, Nepal. Many fatalities feared.

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  • ATR-72 crash at PKR, Nepal. Many fatalities feared.

    A Yeti airlines flight from KTM to PKR has "crashed on landing", with 68 passengers and 4 crew aboard. Photographs and short video clips suggest a significant fire. The aircraft is believed to be an ATR-72.

    Plane crashes in central Nepal - at least 16 dead - BBC News
    Yeti Airlines plane carrying 72 people crashes in Nepal (nypost.com)
    Plane with 72 people on board crashes in Nepal | Deccan Herald

    Click image for larger version

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  • #2
    No survivors. Video in link. Not nice to watch.

    Clear stall / uncontrolled roll situation. I also think were way too low for the distance they were from the threshold.

    Aviation Herald - News, Incidents and Accidents in Aviation

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    • #3
      Originally posted by Gabriel View Post
      No survivors. Video in link. Not nice to watch.

      Clear stall / uncontrolled roll situation. I also think were way too low for the distance they were from the threshold.

      http://avherald.com/h?article=503c63e9&opt=0
      Horrible... Can you see any flaps?

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      • #4
        Did the crew forget to deploy flaps?

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        • #5
          I cannot distinguish if there is any flaps or no flaps. But forgetting the flaps in itself would not explain what happened.

          --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
          --- Defend what you say with arguments, not by imposing your credentials ---

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          • #6
            Originally posted by Gabriel View Post
            No survivors. Video in link. Not nice to watch.

            Clear stall / uncontrolled roll situation. I also think were way too low and slow for the distance they were from the threshold.

            http://avherald.com/h?article=503c63e9&opt=0
            Fixed.

            Sort of had the appearance of a final, measured (but unfortunately a little too much) pull up to avoid trees, etc.

            I assume they were short an engine or two.
            Les règles de l'aviation de base découragent de longues périodes de dur tirer vers le haut.

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            • #7
              Originally posted by Gabriel View Post
              I cannot distinguish if there is any flaps or no flaps. But forgetting the flaps in itself would not explain what happened.
              A contributing factor perhaps. There looks to be a pitch-up moment just prior to the stall. If the plane was approaching stall, the stick pusher would have activated so perhaps this is another case of the Renslow Panic Maneuver.

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              • #8
                I watched an enlarged frame of the video and the flaps don't seem to be extended.

                I also saw a video taken from inside the plane. I will not post the link because I don't think that there is much to learn about the accident. People was in a good mood and then screams, crash and fire. It all lasted just a couple of seconds. The cellphone survived the crash and kept recording.

                --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
                --- Defend what you say with arguments, not by imposing your credentials ---

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                • #9
                  Originally posted by Evan View Post

                  A contributing factor perhaps. There looks to be a pitch-up moment just prior to the stall. If the plane was approaching stall, the stick pusher would have activated so perhaps this is another case of the Renslow Panic Maneuver.
                  That was my thought too. Another thought was that perhaps they initiated a go-around and retracted the flaps instead of the gear or something like that. Still not enough to stall the plane by itself but attempting to maintain altitude before gaining enough airspeed would complete the sequence.

                  --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
                  --- Defend what you say with arguments, not by imposing your credentials ---

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                  • #10
                    That onboard Facebook livestream video is something - you can hear the turbines spooling down after they impacted. But based on the landmarks seen in the full video (what is on Twitter is shorter), they came from the north between the old and new airports. If they were going for 12, that would have put them close to the end of the runway and would have required a severe left for a very short final. I’ll have to look for flight tracker info. But maybe they didn’t have speed or configuration to support the turn and stalled as soon as they dipped the left wing.

                    Edit - they appear to have been over the old airport when they would have started left. I was able geolocate right where the camera left the window.

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                    • #11
                      Originally posted by Gabriel View Post

                      That was my thought too. Another thought was that perhaps they initiated a go-around and retracted the flaps instead of the gear or something like that. Still not enough to stall the plane by itself but attempting to maintain altitude before gaining enough airspeed would complete the sequence.
                      Maybe not a stall but loss of control while under Vmca during a single engine inop go-around. I can't see it but there's some comments stating the #1 prop isn't powered and the rudder is deflected.
                      But wouldn't that scenario look more like a larger yawing rollover than a sudden wing drop as we see here?

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                      • #12
                        Originally posted by Evan View Post

                        Maybe not a stall but loss of control while under Vmca during a single engine inop go-around. I can't see it but there's some comments stating the #1 prop isn't powered and the rudder is deflected.
                        But wouldn't that scenario look more like a larger yawing rollover than a sudden wing drop as we see here?
                        I don't know how anybody can tell from the video if the #1 prop is powered, especially when you can have these frame rate synch effects where you can see helicopters flying heathy with the main rotor not moving at all.

                        In the enlarged still frame I watched the rudder seems to be deflected to the right. Now, at that point the plane is about in a 90-degree left bank and the pitch is quite nose-down and increasing. In that condition applying full right rudder is the right thing to do even if there is no engine asymmetry. Also, the plane can be seen flying at a very high AoA just before rolling over.

                        It still can be a Vmc roll.

                        --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
                        --- Defend what you say with arguments, not by imposing your credentials ---

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                        • #13
                          I don’t see any yaw, just roll, so Vmc doesn’t seem to fit. It looks to me like a stall. I haven’t seen any stills but can the aileron position be made out?

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                          • #14
                            Originally posted by Evan View Post
                            I don’t see any yaw, just roll, so Vmc doesn’t seem to fit. It looks to me like a stall. I haven’t seen any stills but can the aileron position be made out?
                            Yes, when it starts rolling to the left they crank the aileron all the way to the right. Very natural and fatal reaction.

                            --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
                            --- Defend what you say with arguments, not by imposing your credentials ---

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                            • #15
                              From AvHerald:

                              There are currently two fake videos making the rounds:

                              1) The "onboard" passenger video claimed to have been streamed live. This was another flight until the point the video suddenly gets blurred and shows some sort of crash scene. It does NOT show the aircraft rolling in etc. Clearly falsified video.

                              2) The video from the other side showing an engine fire. This aircraft rolls to the right rather than the left. There is no evidence of fire on the authentic video published in the coverage. This video from the right is thus not credible whatsoever with respect to this Yeti Crash.

                              There is no point in trying to discuss either of these videos here in the reader comments, any reference to them will be deleted.

                              --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
                              --- Defend what you say with arguments, not by imposing your credentials ---

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