[HD] Boeing 747-200 confusing TCAS RA
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- čas přidán 22. 06. 2012
- Practising TCAS RA manoeuvers during our MCC course in a Boeing 747-200 full-flight simulator. This one was quite confusing when the Resolution Advisory instructed to climb as we had just initiated a descend.
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![[REAL ATC] Resolution Advisory - COLLISION ALERT - in busy San Francisco!](http://i.ytimg.com/vi/NP_LKNR23yw/mqdefault.jpg)
![[REAL ATC] Resolution Advisory - COLLISION ALERT - in busy San Francisco!](/img/tr.png)
"Climb; climb now." means the intruder was going to pass above, but now they're going to be passing below. When it says, "Climb; climb now", or "Descend; descend now." it's actually reversing it's previous instructions. The "now" is added to reinforce "The situation has changed. Do what i'm saying now."
Perfect answer!
It Ain´t confusing as you said
@@Vanderlindegang1899 Excellent; because I didn't find it confusing at all.
Its not a malfunction, it is a reversoid. when the other aircraft does the opposite of what TCAS says, then you will also have to do the opposite to avoid a collision. Yes, it is REALLY complicated.
gotta love the RA. Flying at a training base with three close parallel runways active, the RA constantly tells us to do something other than what we want to do. 300' off the ground, configured it told us to increase descent.
Below 1000 ft it should be inhibited, either automatically, or manually. That you failed to inhibit RA was a failure in procedure.
@@paradoxicalcat7173interesting
It looked like a reversal, if the initial RA was not going to mitigate a collision then a reversal is used
You can't assume the other aircraft is following *their* TCAS. They were below, and probably decided to halt or even descend themselves, so your descent now put you back in conflict. TCAS sees this, and the two aircraft negotiate. It switched you to CLIMB, in order that they are below and level/descending, and you are above and climbing, therefore maximizing crossing distance.
The command "DESCEND, CROSSING DESCEND" means that TCAS expects you to pass through the altitude of the intruder during the RA, but as you were following this, the other aircraft suddenly levelled off below you, triggering the "CLIMB NOW" prompt.
01:01
Clear Of Conflict 😌👍
very good
TCAS warning! I flew this sim 3 times and 400 once. The 400 is super responsive, the classic is like driving a semi truck. 😂
Holly sh** !
Similar to the -400 and -8
MCC in a B742 FFS? I want that!
I never knew UFO's carried transponders
traffic was below yet TCAS initially says to descend then climb
Intruder was climbing during the first RA, but then levelled off or started descending while still below them, prompting TCAS to issue "CLIMB, CLIMB NOW".
Bug report filed to felis
That was a tracking missle or somthing..... holy cow, drink carts and luggage everywhere.
BS. It was another aircraft. TCAS isn't a RWR.
i was remembered passenger plane and cargo plane is colide in mid air we have no survivor
TCAS 2 Vesrion 7.1, reversal RA, reaction time 2.5" vs 5". It is not always the ATC fault cos many times RA's are triggered by excessive roc/rod of aircrafts. The TCAS will automatically shift to TA ONLY mode when below 1200 to 1000ft agl. Ciaooo
very good
Just had one of these the other day coming out of SFO. Great vid
TCAS is responding to the other plane fucking it up.
the center runway is for instrument approaches and the outside ones are for 2 different aircraft to do patterns
Interesting. Which plane is that? Should be inhibited as you go down on the approach.
From the start, the Non Threat Traffic shows the other plane below them by 900 feet and is climbing. When the traffic advisory come up, I don't know why it would ask you to descend when its 500 feet below you and it is still climbing towards you. When the resolution advisory pop up, it shows the other plane is now descending and is 400 feet below you.
Actually this might make sense if you think about the 3D space and when this was TCAS II Version 7.1.
The other plane climbed until the "Traffic Traffic" occurs but I think they don't stop the climb immediately. So tcas detected the continuous climb and tries to result this as best as possible, so the best possible option might be to descend to get the plane as fast as possible away from the flightpath of the other plane.
Since the other plane might be watching the screen while "Traffic Traffic" sounded, they starting to stop the climb and TCAS reacted with Climb on the first plane to the change of behavior.
t1 at Laughlin afb (kdlf)
indeed it looked complicated. and any idea why the other plane kept reversing its direction? first it was climbing, then descending, then it climbed again. would this warrant tea and biscuits with the manager?
I'd guess their (the conflict plane's) TCAS was changing its mind too. First it likely told them to Descend, but when it saw the cam-plane descending, the conflict plane's TCAS possibly switch to Climb, then when it saw the cam-plane climbing, the conflict plane's TCAS switch back to Descend. I guess that answers the question as to how they communicate... they don't!
@@ColinMcNulty Nope. They do communicate. This reversal occurs when 1 aircraft is not following the TCAS RA. This aircraft was given a DESCEND instruction, thus the other aircraft was given a CLIMB instruction. But if you notice on the display, when the other aircraft has been given a CLIMB instruction, it instead levels off and then descends. Thus, it reverses both aircrafts' instructions; letting the other aircraft proceed with their descend, with a DESCEND, DESCEND NOW instruction, but giving the other (obedient) aircraft, a CLIMB, CLIMB NOW instruction. This puts the aircraft in opposite directions and avoids conflict.
Alternatively, the other aircraft is not equipped with TCAS and cannot follow its instructions; but instead makes their own separation choice based on visual avoidance. Here, the TCAS' only option is to tell the TCAS-equipped pilot to respond by putting them in a reverse path.
Wow thats something you wouldnt want to encounter, but why did it ask you to to descend first and climb after? Some malfunction?
Actually, it's quite the opposite, at the stage of reversal, where the TCAS Changes from "descend" to "climb now" it has actually communicated with the other aircraft, and acknowledged that the other aircraft has also been told to descend. Thus, the TCAS corrects itself by reversing the command and prevents a furthered collision, ingenious isn't it?
@@AussieAircraft98 i dont think that's right, it's reversing because the other plane didn't follow the tcas instruction, not because tcas sent the same order to both planes, the orders will always be opposite and a reversal occurs when one plane doesn't respond to the advisory
+TheDeathBonus That's why TCAS is a last resort safety net. If people never made mistakes, this would be a different world.
wtf?
Climb, climb now
The TCAS should never have to issue RA's if the ATC were doing their jobs properly.
Go home, TCAS! You're drunk.
C r i n g e
@@Alrx7_ you edgy loser, why are you replying to a near decade old comment?
@@TactileCoder hahahahahahaha