Boeing 737 nearly FAILS to TAKE OFF!!

guys have you ever seen a video on maybe twitter or youtube and when you saw the video you thought poof i know exactly what's happened here maybe you've even written a comment about it and then you found out that what actually happened was something completely different well in today's video i'm going to have a look at one of the more viral aviation clips that have hit youtube during the last few years they have more than 6 million views at the moment and it was shot by a really good flight spotter channel called bristol cardiff airport link to the original clip down here that you can have a look at it for yourself and i bet that at the end of this video you're gonna have one of those moment stay tuned okay so this clip was taken back in 2016. and it has been doing its rounds on the internet ever since and anytime that it pops up in the twitter feed or indeed here on the original youtube video it gets a shower of comments from people who have opinions about what these pilots are doing all right and i can tell you that there are very few positive comments most of them are questioning the professionalism of these pilots what they're doing how they can be allowed to fly things like that so let's have a look at the the clip first and see what happens okay so this looks like a turkish airlines airbus a330 this video by the way is shot in frankfurt maine in germany okay the landing runway use is one with zero seven right which is where it's coming down right now and they take a runway uh so oh okay i'm i'm going to be fully in agreement here that this looks very strange this is definitely not your everyday kind of takeoff that's for sure uh so what we're seeing here basically is um a royal armor rock boeing 737 either a 500 or 700 a shorter variant of the 737 anyway and the first part of the takeoff rule looks completely normal they get up to the point where they start to rotate they rotate nice and slowly with about approximation two to three degrees per second but then when they come to the attitude where they should normally take off which is about nine degrees nothing happens you can see that they kind of stop at that attitude you can also see on the elevator that they're putting in further inputs to try to get the aircraft to rotate further but it it doesn't want to it does get airborne there for a few seconds but almost immediately the nose of the aircraft starts coming down again and when it does the aircraft gets back down onto the runway the nose comes down further but the nose wheel doesn't actually get back onto the runway but instead they continue to accelerate and then eventually they do a second rotation and this time they get airborne okay and they fly away so what can possibly lead to something like this what are they doing well basically you have four different possibilities here so if we go through them one by one we'll see which one is the most likely the first one which is the one that you hear most of people in the comments field talking about is either no flap set or incorrect flap setting so no flap set is out of the question you can clearly see on these pictures that's the leading edge devices the slats is hanging out so they are definitely extended that's the you know the front part of the wing and you can also see if you look very closely that the trailing edge flaps are also out but not too much which would indicate that they're probably taking off with flaps one here so then incorrect flap setting well sure i mean it is a possibility that they have calculated with the flaps five departure but set flaps one by mistake and that they've taken off there wouldn't be any take of configuration warning or anything for that and it has happened before but what you do have to understand then as well is that 4737 with two engines operating do making that mistake all by being serious will not stop the aircraft from flying right what what it will do effectively is that when you rotate parts the uh the attitude where you should get airborne around nine degrees it will not get airborne instead it's going to be at airborne at a later stage with a higher altitude because you you're not at the correct speed okay so you will have less tail morgan but with an aircraft like this shorter you need to get up to 16 degrees attitude before you start scraping the tail so it wouldn't have been dangerous in most and likely they wouldn't even have noticed it until they start to retract the flaps and realize that oh we only have laps one we should have had flaps five and then it's a very embarrassing report that you have to write so it wouldn't have led to this so then we get to the second one which is an incorrectly trimmed aircraft okay so let's say the aircraft has the incorrect trim setting it's too much trimmed back so the nose wants to get off the ground before the pilots want to do it or that they have freight on board and the weight and balance is not correct well in that case yes if it is extreme you might get an aircraft that starts rotating before the pilot wants to but if that happens you would see it right you would see that the elevator is pushed forward because the pilot knows that they don't want to rotate there so if the aircraft starts rotating without them wanting to they would hold you know they would pitch forward to keep the aircraft on the ground until the speed is correct you don't see that right the the elevator is flush with the um horizontal stabilizers so that's not the case so then we get to the third option okay that is the aircraft is rotated at the wrong speed now even though that is a possibility it is highly unlikely because to rotate at a really low speed a really low indicated speed um that would both feel and look very straight into the pilot okay you know when to it live when you're flying this aircraft for a while how long time it should take to reach a certain speed and if you see or hear that the aircraft has started to rotate very early on the pilot monitoring whose job it is to monitor the aircraft um instrumentation would look down and say no this is not correct all right and there's no way that a train pilot would rotate below 120 knots for a normal weight okay because you would intuitively know that something is wrong with that so then you have the possibility of them setting for example wet speeds or slippery speeds in that case the v1 speed might come quite early and v1 is the decision speed all right that's the highest speed that you can still reject the takeoff on after that you are kind of committed to the take-off now if there is a very junior inexperienced first officer flying they tend to be used to hearing v1 and rotate at the same time because that's more or less what you get on dry runways and if you then have done that you know many many many times and then all of a sudden you have a slippery takeoff or a wet take off where v1 comes way before rotate well then there is a possibility that they might start to rotate at the v1 call right okay that would be a possibility if it weren't for the fact that you would have a captain that would stop them from doing this and also it's a dry day okay it is not slippery and it's not wet so very low chance of that being the case so then we get to the fourth possibility and the fourth possibility is some type of upset all right something is happening to this aircraft as they are getting into the rotation phase of the takeoff now when we take off with very strong cross winds especially gusty cross winds there is always a risk that as you're taking off and you reach your rotation speed there is a sudden gust of wind and if that wind turned from being straight crosswind to a little bit of tailwind well then the speed is gonna go the airspeed you know which indicates how much air is flowing out over our wings is gonna go from the rotation speed where the aircraft can be rotated safely to below that speed and the aircraft might not be able to fly right this is why in those kind of conditions we brief the pilot monitoring to say like okay we have gusty winds today that's crosswind monitor the speed and if you see that it's fluctuating just before rotate just wait a little bit hold off on the rotation call until the speed is stabilized above vr then call it so that we don't tail strike the aircraft okay but the curious thing here is that that's not the wind they have right you can clearly see the windsock in this video clip and you can see that it's hanging down a little bit it is benign very light winds so what can then have possibly happened well it turns out after having spent hours watching this clip that you actually probably have the answer to that question in the clip itself in the first couple of seconds of this video up to about a second 20 or so you can see that it's an airbus a330 on approach runway 07 right in frankfurt okay hit land and then you have a clip which would indicate there's a little bit of a time delay and then the air morocc 737 starts rolling down so given that you can see the air morocc taxiing out when the airbus 330 is and final you can estimate that it's probably about a minute later or so that's this 737 is taking off and we know that because of all of the bad publicity that came out of this video air morocc actually went out onto their official twitter feed and said that the aircrew had gotten a warning of wake turbulence by air traffic control before they departed right but how can that possibly create something like this well when we think of wake turbulence and wave turbulence by the way is those vortices that comes out of the wing tips of aircraft all the time but especially during takeoff and landing it happens because there's a high pressure below the wings and a low pressure above the wing so the air tries to escape from below the wings to the top which means it creates these vortices and when we hear about wake turbines we normally think about possible disturbances in the role plane okay because if it happens on the same runway as you are taking off from if a heavy aircraft has come in and landed before you when you come into one of these vortexes well then it might flip you over something like this might happen but if you think about it this airbus 330 came into land on a runway that's almost reciprocal to runway one eight so if we take the potential kind of path of how these vortices would move these vortices as they leave the wingtip will typically fall with about 400 feet per minute and the airbus 330 in this video looks like it's between 400 to 600 feet above ground as it passes around with 1 8 well then a minute later the vortices would have reached ground level okay now picture those vortices that normally disturbs you in the role mode and then turn them 90 degrees what could have happened then is that the vortex from the right hand wing of the airbus a330 remember on the right hand wing the vortex would be turning counter-clockwise because it's going from under the wing to over the wing it would have fallen down onto runway one eight and given the approach path in the runway zero seven right it's very likely that that would have ended up pretty much exactly where the air morocc 737 is rotating so this crew of the boeing 737 would have had perfectly normal indication of their airspeed as they are accelerating up for their normal takeoff then as they get into the rotation they hit what's left of this waters and it will come as a sudden tailwind right that will cause the airspeed to decrease and the 737 would not be able to fly right it would have lost so much speed that as they rotate up to their normal attitude the aircraft is not taking off okay the only thing that the flight crew can do at that point because remember they've passed v1 right they've passed the decision speed they're now committed to the takeoff is to lower the nose because they do not want to get the aircraft airborne installed all right so they lower the nose the aircraft returns down on the runway they keep that attitude they keep building the speed and as they do and they go further down on the runway they will then get out of this vortice as well the airspeed will come back to them it goes above their rotation speed and they can do a nice safe rotation and fly away so what you're actually seeing here guys is an air crew that is handling a upset during a very critical phase of their takeoff during the rotation in a very professional way all right they are doing what i would do in a similar situation they're dealing with something that you can be absolutely sure that they've never dealt with before in a nice controlled manner you don't see any erratic movements on the flight controls you just see the nose coming down it's held off it doesn't touch down the nose continues accelerates and then does a nice slow rotation and it climbs away and something that further kind of makes me think that we're dealing with some really professional aircrew here is that in the twitter response that air morocc put out it says clearly that the crew of the landing immediately reported this incident which is something that we would do all right if we come across something that is unusual even though it might not have caused any damage to the aircraft any injuries or anything like that we would report it so that that information can go back to frankfurt main airport and say that listen you did warn about potential weight turbulence we experience this think about potentially extending the period of time before you clear for takeoff in a situation that is similar to this right this is how we deal with things in the aviation world and these guys clearly follow the same path so i found this fascinating all right i thoroughly enjoyed watching this video if you have more videos like this that you want my take on well then contact me okay you can send them in to news at mentorpilot.com that's our official kind of tip hotline or you can contact me on twitter um on instagram obviously you can put it into the comment section here on youtube or get the free mentor aviation app all right or going to my um to my discord server that works as well no matter how you do it it doesn't matter i love hearing from you guys send it in i hope that i have um kind of earned a subscription for you if you like videos like this make sure you've subscribed and that you've highlighted the notification bell so that you know when i'm sending out new special videos on things that might happen in the aviation business that's it guys next week i will continue my series about famous air crashers investigation it is a a fairly terrible crash that we're going to be covering but a very important one from a safety perspective so until then i hope you're doing absolutely fantastic and i'll see you next time bye [Music] you

Channel: Mentour Pilot

Views: 790,114

Keywords: Aircraft fails to take off, viral aviation video, Boeing 737 fails to take off, Boeing 737MAX, Aviation explained, Aviation facts, Airbus A330, Airbus A320, Fear of flying, Fear of flying help, Mentour Pilot, Mentour Pilot Boeing 737, Nervous flyer, Breaking aviation news, Viral debrief, Boeing 747, How to become a pilot, Wind shear, windshear escape, flight spotting, aviation accident, air crash investigation, breaking news today, nervous flyer tips, boeing 737

Id: TEjbg_2yuFI

Length: 16min 56sec (1016 seconds)

Published: Fri Feb 19 2021