Boeing 747 Traffic and Collision Avoidance System (TCAS). Pilot actions
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- čas přidán 25. 01. 2022
- Hello everyone! How do you do! Time for a snippet! This one I made in the simulator very quickly to remind you of the TCAS or Traffic Collision Avoidance System. This system alerts pilots of conflicting traffic and gives the pilots( in each aircraft, what action to take, to avoid a collision. On the B747-400, the avoidance action is manually managed by the pilot by disconnecting the autopilot and Autothrottle. Then the pilot must obey the command even if it conflicts with a previously given ATC ( Air Traffic Control), instruction. The thing is that the systems in the aircraft ’talk’ (communicate) to each other - so if a conflicting aircraft gives a climb command, then the other aircraft will get a ‘Descend’ command and vice Versa. In the case where the other aircraft does the opposite to the TCAS command, then a reversal in command will be given in the other aircraft. The pilot must respond to a TCAS Resolution advisory within 5 seconds and for a reversal within 2.5 seconds. So this then is a quick video showing you what is going on in the flight deck. ( It is NOT a violent manoeuvre per se but should be responded to within 5 seconds when a Command is given by system). Remember this could happen In the middle of the night say and on a passenger aircraft you might be watching a movie or Indeed sleeping. Pilots must be alert. Hope you like it- ‘Chi Di Gin!’ - Later!😀✈️✈️✈️
I love the words "Clear Of Conflict". The most satisfied message!😄
Extreme ASMR 😂
Whew! I’m like..uhh y’all are super chill for an aircraft coming right at you in the flight levels! But then I quickly realized this was a sim and no one was in danger😅😅. I like your behind the scenes videos, capt. One day I too shall become a wide body captain👍🏾👍🏾
Keep eating lots of sugary foods and stop exercising. You'll become that wide body in no time 😅
Yes you will become a Widebody Captain and more!
@@charlieinsingapore LOL! 😂
@@charlieinsingapore XD
@@charlieinsingaporelmao
Thanks for this short TCAS presentation! 👍
Training paid off.
Word to word from the book, good work.
My choir director and mentor in college used to be a pilot. You and him have similar tones of voice, very relaxing. Happy flying, captain!
Right here my captain.Thanks for sharing.Building up for my son to be a "pilot obet".Very motivating
Nice video. And when ATC gives advisory contradicting TCAS, ignore ATC and follow TCAS.
Uberlingen...
UNABLE, TCAS RA
Beautiful, thank you for sharing your experience and knowledgeable info.
Please continue with your safe journey and share this type of knowledge with us.
Captains are Heros. Than you for keeping us all safe. 😊
Obet - thanks for posting - just getting ready for a 6R sim.
Amazing!.....I imagine the reversal must have caught people out, great training.
Wow, I learned something very cool to me!
Fantastic! 👍
Cool video!
wow that was intense .
Adjust Vertical Speed was so confusing (doesn't tell how to adjust). Glad they changed it to "Level off" which is more precise.
"Level off, level off" and "maintain vertical speed, maintain". Much better than before.
The most tense minute ever
thank you movie betiful from japan
Bro ur such a great
Thank you
Scary stuff, I would imagine a rare scenario though?
Yes
Just happened between an Allegiant A320 and a Gulfstream jet on 07.23.23 requiring a 600 foot climb. I came here to see how it would go down. Thanks.
There is a russian plane and DhL plane that did not get this right.
This scenario only happens when the other layers of the Swiss cheese model were already hit, the TCAS is a last layer of defense for when ATC messes up. The fact that it happens at all is bad enough that it needs to be reported, despite still having good survival rates if procedure is followed.
@@fidelochieng5193That was because Russian pilot training mandated pilots to follow ATC over TCAS
I like to think of TCAS as standing for "Transponder Conflict Alert System".
Interesting.. TCAS had to give the other plane's crew a instruction to climb, as you were instructed to descend initially. Why did it happened so? Did they start to descend on their own discretion before TCAS reacted?
The TCAS RA reversal could be prompted by a pilot’s misguided decision to comply with an opposite ATC instruction during the RA. Overriding the TCAS logic.
with two aircraft approaching head on the distance must close very quickly, and the temptation to look out the window must be hard to resist, but you've got to trust the technology...also I think at those elevations it's quite easy to stall the aircraft if you're not careful? Also, a bit surprised TCAS is not connected to the autopilot system and make the maneuvers in each aircraft this way rather than handing it over to the pilots. Not possible?
Good question at the end of your comment.
That technology actually exists but the majority is by pilot response- it will come. I could ask the same for motor vehicles…why isn’t there an automatic collision avoidance system with other cars? The variables are endless- that may be the issues
On the latest Airbus standards on all types, TCAS is connected to the AP and will follow the Resolution Advisory. It is called AP TCAS. You will see with traffic incmoming that it arms itself (cyan colored annunciation on the FMA) followed by a green TCAS on the FMA once it starts to follow the RA. Not sure if Boeing has an equivalent system.
@@aviovintage correct. Some of it was installed on the biz jets before Airbus.
Airbus has the option to link TCAS to autopilot so that the plane automatically does any corrective action.
Wow! This is quite educative. I always thought this process is left to the computers to handle after the initial traffic advisory alert. Didn't know there has to be manual inputs by the pilot.
Question: Why did TCAS command you to climb after initially descending?
Bloody hell, that was close. Edit..just read the discription notes.
Man that scared me too. Forgot to read the description lol
Hi Captain Obet - i am currently training for my EASA PPL and hoping to go on to a ATPL after this. When i was studying for theory we were taught the Rules of the Air in Air law that the correct action in a head-on convergence would be a right turn for both aircraft, and not a climb or descend. Could I ask why in this case the corrective action suggested is a climb or descent only? Is this a class A airspace specific constraint? Thank you and please keep up with the videos!
Hi, thanks for the good question. The rules of the air you have learnt are correct, however, this response from TCAS is for IFR flying not visual. If you are flying VFR then you could deviate to the right since you would be visual with other aircraft like around training airfields, in the circuit etc. If you were in cloud, you would rely more on the TCAS.
@@pilot_obet7815
I think he was asking why is the TCAS telling you to “descend” instead of “turn right”?
@@sam04019491 yes I know- it doesn’t. Imagine if you were driving a car and approached another car head on- if you could, the best avoiding action would be to hop over the other car or go under it, no radius of turn issues etc😀
@@pilot_obet7815 But then I’m thinking about the possibility of the other aircraft’s TCAS telling it to to make the same maneuver, assuming both planes are at the same flight level. Or maybe they’re connected and can decided which aircraft should do which action?
Edit: Just did some research and it looks like the TCAS has it’s own transponder to communicate with other TCAS units, which is also how it sees other aircraft.
TCAS does not provide horizontal resolution advisories. There was TCAS III that used directional antennas, but that method wasn't sufficiently accurate.
Terrain! Terrain! Pull up!
That could end in a catastrophic disaster as the plane needs to level off and then climb ij split seconds. So the plane missed each other bij a margin of maybe 200 feet?
Why Tcas first say "descend" and later change the "climb" ? Can you explain pls?😊
you shit your pants when you hear TCAS say any instruction with NOW at the end.
Descend! Decsend! Actually, climb!!
Hello sir,
To understand, you and other traffic descended ? then the TCAS saw it and said to climb to avoid the traffic in descent ? after crossed, it was below exactly ?
I'am in ATPL course, it's always good to see in real or in video something learned.
Thanks in advance Captain
I didn't understand either. It seems first airplane and other traffic descended, then the TCAS saw it and said to climb to avoid the traffic in descent, as you described. Did you find and answer in the meanwhile, dear friend? Thank you.
@@RobertoPietrafesa "Our" plane was instructed to descend, while the other plane was instructed to climb. For some reason, the other pilots ignored their TCAS and descended aswell. The TCAS realised this, and reversed the instructions to avoid the collision with the "stupid" plane
i know its a simulator but its distinctly more funny to imagine someone having the balls and the lack of brain to do this irl
Why was there reversal or decision, it first said descend and later ascend before clear of conflict
Shouldn’t A/P be disengaged after the first traffic callout
You didn't decend much 2° at most and the reversal was less. Separation less than 200 feet. I'm wondering why not 4 or 5° ??
first picked up less than 20 miles ahead..both approaching at aprox 450 g/s doesn't give a lot of time
Certainly doesn’t!
If I’m not mistaken Airbus handles Tcas conflicts automatically while Boeing needs a human intervention ?
So this thing talks to the TCAS of the other aircraft(s)? Is there a negotiation of sorts, "I'm going to tell my guys to climb and you tell yours to descend"?
Yes- exactly that!
Essentially the transponders on the planes talk to each other and when nearby the TCAS can interpret the information and they can negotiate the resolution advisory to deliver to the pilots.
that was close phew
Why did it make you descend first though?
I hope it will be able to tell you to go left or right too one day.
So the ATC felt asleep or something?
Can't we climb/descent earlier immediately when we hear "traffic traffic"? just curious, explain please
Sometimes the traffic is not a risk however the system warns as early as possible to prepare the pilots in case. If action is needed then it will issue an RA (Resolution Advisory) such as decend, climb, adjust vertical speed, etc. No need to take drastic action if it's not needed
@@joshuasprucie8933 thousands of thanks!
Does TCAS change the altitude or is the pilot supposed to do that ?
Pilot does it until clear of conflict
No instruction from ATC to either aircraft in this instance? Hard to understand that
There wouldn’t be any ATC if this was oceanic so maybe that’s why.
Why does it first say descend and right after that climb? Should be just one of the two? Also why does it wait soooo much almost until the last moment to warn you and give you directions. You saw the traffic almost a minute earlier and by the time it warned you you had I don't know 20 seconds to not crash on it?
to maintain cruising altitude
What this a flight simulator or irl
How many advisories does the average airline pilot encounter annually?
Not many- I have only had to real ones I had to respond to in 20 odd years- ATC controllers/radar controllers do an excellent job of maintaining separation😀
@@pilot_obet7815 That is quite impressive, considering the busy and congested airspaces you fly to.
does the TCAS say one aircraft to desend and one to climb
yes
So another plane obviously had the same warnings , so how did they decide which one will go up and which one down ?
sometimes other plane has also has the same warning,the one is descend and the other is also descend, but the reversal command will only apply one plane, so thats how TCAS avoid mid-air collision.
@@iceland789 that was a month ago , I did followed few more videos about them , and yeah TCAS communicate with eath other and push instructions to pilots , thank you for answering
Atc here. Why does the tcas have you start down first then climb?
I was demonstrating a reversal in an instance where the other aircraft does the opposite of what it was commanded.
I was demonstrating a reversal in an instance where the other aircraft does the opposite of what it was commanded.
doesn't both airplanes get the warning climb or descend so that they both climb and crash
I have the same question
yeah both of them get warnings but tcas are then connected through like signal and one says climb other descent
the planes are connected so one will get a warning to descend and the other will get a warning to climb. they won't get the same warning (hopefully if everything goes according to plan)
Never play chicken with a 747. You'll lose every time.
1:30 and another 700 people saved.
Bros about to die but survived xd
Looks like it made both planes descend, and then it made your plane access
It was simulating the crew in the other aircraft doing the opposite of the resolution advisory
@@pilot_obet7815 In other words, the Überlingen scenario.
Como se llama esta alarma 1:05?
Autothrottle disengaged, but bro I can't find video of it
TCAS is so cool but why the reversal? "Descend" then almost immediately "climb". Just 100 ft. A bit worrying 😰😂
Hi, I covered it in the narrative in that I said that if the other aircraft does not do what is commanded, as in it climbs instead of descend for example, then the other aircraft would get a reversal. Have a read of my narrative
@@pilot_obet7815 Thanks for the explanation Captain Obet. However, the obvious follow on question would be, when you get a reversal does TCAS then automatically reverse the other aircraft and also what happens if the other aircraft responds belatedly causing confusion?
@@thomism1016i think the TCAS knows what instruction its sending to each plane so i think that doesn’t happen (?)
TCAS is constantly communicating with the other aircraft TCAS system during a conflict. If one pilot does the opposite of what their TCAS says, the system will recognize that and tell the other plane to climb or descend as a response. TCAS can also recognize if you're not climbing or descending fast enough to clear the other aircraft and will tell you "INCREASE CLIMB" or "INCREASE DESCENT".
Uhhh, I'm sure the passengers wouldn't mind if they never heard about this.
WHY ???? And why it says descent then it says climb ? how can 2 planes end up in that situation ? who made that mistake ?if it was straight at the same level with you why didn’t you climb the second you saw the aircraft on your map ? why do you wait for the computer to tell you to climb ?
you might need to check the description
What does it mean level off??
level off = stop climbing/descending i think
@@myrjavi thanks
@@myrjavilevel off is when the plane height limit is passed and need the pilot to go down.
is this motion sim or real life
simulator
I'm not an expert but according to other comments on other TCAS RA videos, radio procedure here was wrong. You should announce the TCAS RA to ATC when it happens (not afterwards) and then you should report clear of conflict after. Is that right?
The whole scenario happened faster than someone could say "XYZ Center, Callsign descend/climbing due to TCAS RA". Nothing wrong with that
@@Jusiun From the video description: "This one I made in the simulator very quickly to remind you of the TCAS or Traffic Collision Avoidance System". So I interpreted that they were trying to show correct procedure. Either way they're not meant to announce TCAS RA after it's already gone because then the controller thinks they've just got a TCAS RA and will be following it now.
@radiosification even so, FAA's TCAS II Intro Booklet states 'pilots (...) continue to communicate as needed and as appropriate with ATC'. So it would still be fine if the pilots can reasonably explain afterwards. IRL the PF would do the maneuvers and the PNF would do the radio call simultaneously. I think this video was more of a 'hey this is what TCAS is like' and not a 'this is the correct TCAS procedure'.
bro do it like in a simulator or somthing pilot get payed allot
To me, this sounds kind of... incomfortable.
Whoever recorded this, you put the lives of many people in danger. As a pilot you have a responsibility and you should never be recording as your focus should always be on your cockpit and aircraft and any incoming aircraft as well. Fly Safe!
Um, @CockDepartment__ : As the summary said, THIS WAS IN THE SIMULATOR. Not an actual flight.
all that sky and you want to fly on the same lane?!?!