TCAS - Traffic Collision Avoidance System; Detects other air traffic in its airspace and instructs crew to take avoiding action. 3D animation from aircrew training dvd.
This is part of the TCAS Resolution Advisory and is called "Instantaneous Vertical Speed Indicator". The needle shows how fast our plane is climbing or descending. The outer dial in orange or red is the required vertical rate to avoid the collision. At 0:15 TCAS orders to descend at a rate of 1500 fpm. As the other plane is not obeying its own TCAS, ours reverses its instructions and orders a climb instead.
@Dreamliner312 yeah the Bashkaranian plane tcas said to go up. I know ATC gave them conflicting info but when the Bashkaranian place started disobeying their tcas why didn't the DHL tcas do what happened in this video and reverse saying go up now instead of down?
Right! This happens if one of the pilots violate the tcas order givin to then, tcas will tell 1 plane to climb and the other to descend, it looks like both aircraft were descending and tcas noticed hence the tcas reversal (CLIMB, CLIMB NOW)
Look at the TCAS display, the conflicting traffic is initially above us (shown by the +01 above it), so first we are told to descend. However, the traffic also descends (as shown by its down arrow) and it ends up below us, so a TCAS reversal occurs and we are told to climb. This logic prevents a repeat of the Überlingen mid-air collision where one aircraft incorrectly ignored TCAS and followed ATC's descent orders and hit another aircraft in a TCAS decent. All 71 aboard both aircraft died.
@@RomanianProductions It's why pilots are now trained to ALWAYS place TCAS above ATC in terms of priority. If the TCAS says one thing and ATC says another, do what the TCAS says, EVERY TIME.
Actually, reversals didnt exist until after the überlingen disaster. That mid air collision was the reason for the reversal to be added in the first place, the pilots only got the instruction to increase descent, even if the other plane ignored TCAS
TCAST IS VERY HANDY EQUIPMENT. IT SAVES A LOT OF ASSES THAT COULD HAVE BEEN DEIED IN THE AIR. There were many air collision happened, before it was invented, so the guy is showing you how it works.
Even after it was invented, midair collisions still occurred. Case in point, Bashkirian Airlines Flight 2937 and DHL Flight 611. Their midair collision happened because Bashkirian Airlines Flight 2937 received a TCAS instruction to descend and an order from ATC to climb. They obeyed ATC and descended practically on top of DHL Flight 611, which was descending as per a TCAS instruction, and got cut in half by the DHL freighter’s vertical stabiliser. There were no survivors on either aircraft. The moral of the story, TCAS always gets priority over ATC.
@@MrSupercar55 same thing nearly happened to two JAL planes over Shizuka, both planes received orders from ATC that contradicted the TCAS instructions. Fortunately one of the planes, a 747, dived when the pilots saw the MD-11 hurling towards their path.
the distance that is showing is the distance to a radio beacon (VOR). If the aircraft is not flying directly to or from this station, it will obviously not show the correct groundspeed
Oh yes. Seconds before the planes met it still said +00. But I think that final climb warning could have come earlier. But that was adrenaline in the sky. Or in the simulator?
@@simonpeters2128 i guess it’s a simulator because of the steady cam while the plane makes heavy movement changes and the VOR distance is too clear for a 12 year old video.
@@simonpeters2128 TCAS only instructed the climb because the other aircraft ignored its own TCAS. The climb, climb now! Instruction indicates that we have to reverse our own previous descend instruction. In this case, TCAS couldn't have known the other aircraft would change climb rate this close to the collision
Why? Its just the autopilot disconnecting thats a normal sound its to alert the pilots that they need to be in manual control of the aircraft. Personally, I think the GPWS is more haunting as its usually some of the last sounds you hear on a cockpit voice recorder before a fatal accident. "Terrain, Terrain, Pull up.
I like how there's two tiers of instruction: the polite one, and the aggressive buzzing one that's saying "hey fuckstick, pay attention so you dont die in a matter of seconds"
@fIugasche in real situations like this, there's no time for "please"... I saw a flight sim training video where a future pilot was saying someth. like this, "we have a fire on board, could we please land at your airport" and he failed the training unit because of this :D in emergencies there's no time for politeness
*BTC 2937:* "...Descent" TCAS: Climb, climb Narrator: TCAS telling them to climb, the controller telling them to descent. 3rd pilot: He says climb. Captain: He's guarding us down. (the controller) (?) (Descent...) Controller: Bravo Tango Charlie 2937, descent level 350, explanate descent. Captain: Explanate descent level 350. Narrator: Peter Nielsen think's he's avoided the collision to telling the Russian plane to descent, but what he doesn't know is that the DHL pilots recieving the TCAS instruction telling them to descent. *DHL 611:* DHL 611 TCAS: Descent, descent. "Increase!" "...? 600 TCAS descent!" Narrator: They trying to tell Nielsen that they have an TCAS instruction to descent, but Peter can't hear them. Ff both planes abate TCAS, there will be no problem. But the Russians instead of climbing has followed the controllers orders. Now both planes dives to each other! *BTC 2937:* 3rd pilot: He's going below us! Captain: Fk where is it!? ?Pilot: THERE HE IS! Captain, Co-pilot: 😱😱 (reaction) TCAS: Increase climb, increase climb! Pilots: CLIMB HE SAYS!!!! CLIMB!! Pulls on yoke *DHL 611:* Co: Descent! Fk, descent hard! BTC 2937: Pilot: CLIIIIMB!!! All crew: AAAAAAA CLIMB AAAAAAAA *Collision*
At 0:26, why didn't this happen during the Uberlingen incident? The video shows here that the intruder plane is not obeying their TCAS which is to supposedly to ascend, but the intruder plane is descending. So in our plane we are now told to instead of go down, to go up. Why didt this happen on the DHL plane?
Few questions: 1. 0:03 you can see an aircraft in front of you coming straight towards you. I would like to ask about that number +0,1; what does it mean? Does it mean that the aircraft in front of me is only 100 feet above (whereas the safe clearance is 1000ft)? Then at 0:18 you have number 00 and there is also a red downward arrow. What does that arrow mean? Does it mean that the aircraft in front of me started descending?
I'm soooo late but the +1 means he's in a higher altitude than you by aproximately 100 feet so the TCAS alert says "Descend Descend". But then the other aircraft started descending as you can see by the downward arrow so the TCAS alert warns the pilot to "Climb Climb Now"
Stefano Eglione Because the other aircraft suddenly started to descent. You can see a arrow next to the orange square dot. So the aircraft now should climb to avoid accident
thats called a "change to previous RA" Climb/Descend Reversal, basically if the intruder ACFT suddenly descends or climbs, the TCAS will reverse its previous RA to avoid CPA (7 years late oops)
TCAS was actually extremely accurate at detecting and altering. Genuinely impressed given the fact that the opposing aircraft suddenly started to descend, it caught it swiftly.
how does the TCAS work? I know they pickup nearby radio signals, but how do they "connect with each other" so that they can tell the pilot in plane 1 to descend and pilot in plane 2 to climb?
I’m confused. First it told him to descend, the other plane descended instead and then it told him to climb. How would the pilot react in this situation he wouldn’t know what to do if it told him to climb in the last 2 seconds after telling him descend first?
That's why videos like this exist - this is a 3D animation from an actual training video. These days the crew are taught to always listen to the last instruction the TCAS gives, even if it conflicts with a prior instruction.
So when the aircraft were crossing eachother, this aircraft wasn't anywhere near the rate of ascent it said it needed to be to avoid the conflict. As the planes were right on top of eachother, it looked like +0. So, they could have crashed but just got lucky?
You can see at 0:33 that the conflicting aircraft is 300 feet when it’s directly passing below our aircraft (as indicated by the “-03”) and descending (indicated by the down arrow). The other aircraft is already at least 100 feet below at 3 nautical miles out (the half range ring indicated by the dashes around our aircraft’s marker.) (0:25)
Debería ser más enérgico desde que aparece el avión, y aun más a la mitad, es extremadamente suave e inprudente esa alerta, parece que es cualquier alerta 🙄
It tells you the minimum rate of climb or descend (vertical speed in feet per minute) to avoid the other aircraft. Your vertical speed must not be on the red circle.
Why did it say to descend at first but 5 sec later to climb? Like it didnt decided what is better to do. Couldn't this uncertainty of tcas put your flight in a danger? Am I missing something?
Now what is the procedure to turn around and fly back to that guy so you can scream at him out the window and flick him off? Is there an instruction for that?
Then at all times you see a big white arrow that spins around, also for example at 0:33 a red red circle (which actually covers 3/4 of the circle) appears around. What do these things refer to? BTW, is there anyone who is using FSX? If so, is there any way to increase air traffic by a lot (while you are playing), and also have a working TCAS on the aircraft? Thanks for responds. :)
AHMAR Shomosha ahsay.... R Jodi upnar BA na hoi tha k. Upnar Dhorjjoo k Chumu tar pai. Ahmee amonn cann holam Bujsee na. Kono gusanoo Plan nai. Dhorjoonai.. Systematic try nai. Celeme pana..
@@CARST_IN_THE_AIR no, the russian had tcas. But at that time yet the tcas wasn't mandatory but just an auxiliary system to use as advice in many countries
At Uberlingen in 2002, both aircraft definitely had TCAS, however when their collision course was noticed by ATC the operator gave opposite instructions to the TCAS alerts (TCAS was saying "climb" but ATC was saying "descend," and vice versa with the other plane). Correct procedure is to always obey the instruments, which the one aircraft did (they ignored ATC and obeyed the TCAS alert to descend), however the pilots of the other plane were old-school and not trained in an equivalent way and thus they did as they were told by the human operator-- and thus both planes descended and collided in mid-air. TCAS was working perfectly, but it only works if you do what it says, and thus the incident was, among other things, a tragic but useful example of that.
underverser the receivers “talk” to each other to take the opposite action in each plane if the other plane does not follow the orders of their TCAS than the orders will be reversed for the pilot listening to their plane which is why it changes from descend to climb.
