HOW was THIS Allowed to HAPPEN?!

On the 7th March 2020, two Air Canada #aircraft experienced a close call on 06L at #Toronto Pearson International airport. The two aircraft involved were a #Boeing 777 and a much smaller #Embraer ERJ-190. A Dash 8 also makes an appearance. The weather on the day was beautiful with high clouds and a temperature of -5°. What could have caused just an event to take place? Let’s #explore!

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Below you will find the links to videos and sources used in this episode. Enjoy checking them out!

Sources
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Final Report:

Wake Turbulence: Topfelya

CHAPTERS
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00:00
00:21 - Setting The Stage
01:16 - The Control Tower
02:57 - The RIMCAS System
05:21 - When Is It airborne?
06:41 - Separation Rules
10:42 - The Aircraft Involved
12:18 - 777 Takeoff Roll
13:15 - Avian Traffic
14:24 - A Masked Message
16:09 - Closing The Gap
17:54 - RIMCAS Comes Alive
19:16 - Contributing Factors

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[RCassinello]

What I find most interesting about this story is that... No one did anything wrong. No one made any mistakes, made a poor decision, broke the rules... Everyone behaved properly at all times and it was the actual system that let everyone down.

[vandecayear]

Damn dude, your ability to explain a situation to those of us who have zero aviation knowledge (like me) is really amazing. Very impressed!

[The_ZeroLine]

I’ve always found the fact that they’re using comms on the runway that can block out another to seem like such an archaic system for such a high tech and safe industry.

[ExMachina]

The professionalism from all parties involved makes you realize just how tight these airports are run.

[CapitalisticEmu]

I loved how the 'highly optimized ATC workflow ' was called out as a contributing factor to the near-accident. Taken out of context, that phrase may seem like a compliment ! Loved how you laid out the ATC operation context so that the rest of the story made sense ☺️

[nutsbutdum]

The RIMCAS system having to wait for a 50 knots threshold from a decelerating airplane is pretty dangerous in my opinion. The simple fact that the airplane is decelerating should indicating a rejected takeoff and immediately trigger the RIMCAS system.

[SirFloofy]

17:10 trucking instructor once told me "if something happens you are not prepaired for or havnt been trained for, go with your first instinct. Its usually right". thats what this pilot did, nobody got hurt, nothing damaged. Win in my book.

[markwybierala]

A simple suggestion for a solution would be a rule that a call-out for a rejected take off must be repeated until ground control acknowledges it. Along with that would be to establish an SOP to include a pre designated runway exit instruction (in case of rejection) to enable a safe exit from the runway at busy airports.

[AFloridaSon]

You make a great teacher. As a non pilot, I still enjoy your videos very much, because you explain things in a way that even I can understand.

[KingdaToro]

It seems insane to me that an aircraft will report itself airborne before V1. There's no guarantee that it will actually become airborne up until that point.

[katherynedarrah]

Also, I back the Boeing's decision to reject 100%. As you said, at this point, there's no time for complex decisions. There'd be 2 thoughts in my head "are we passed V1" and "can we safely reject"

[Kiwi]

For all the incredible safety systems involved in the aviation industry, marking something "airborne" when it's clearly not airborne is absolutely unfathomable to me

[ipsfryt]

The graphics used in your videos to help explain what is going on are just outstanding. Fantastic job guys.

[sttv]

Ah the “combined position.” This concept is probably familiar to many people in other professions. We certainly know of it in health care. This is where you keep cutting staff / costs until you achieve a really really good balance sheet. Ideally, some executive should get a promotion or a big bonus. I believe that the process can continue until a complete disaster happens. If you are really really lucky this will only cost a huge amount of money and prestige. But quite often it also costs lives.

[plektosgaming]

It is still amazing that the communication systems still are subject to interference if used at the same time. Especially when you consider larger airports with potentially dozens of planes using it at once.

[KChristopherCarvalho]

I'm an air traffic controller. It's possible that there is an aviation channel out there where the host has a better grasp of ATC equipment, procedures and environment, and the ability to clearly explain it, but I haven't come across it yet. The amount of research Mentour puts into his subjects is clearly evident.

As to the comments about the radio issues of multiple aircraft and/or ATC stepping on each others transmissions, this is a real problem in our ATC environment during busy periods. However, usually, transmissions don't overlap precisely in length so there is some indication to the controller that he/she missed a call and they can solicit that missed call. It was bad luck in this scenario that they apparently fully overlapped. Also, full duplex communications in ATC have the potential to wreak havoc on communications as it would allow multiple transmissions at the same time (imagine a party line phone call or zoom meeting) with no ability to distinguish any of them. Additionally, the current system, in the event of a stuck mic (stuck PTT) on an a/c, because ATC radios are more powerful than a/c radios, allows ATC to override the stuck mic transmission and still transmit to other a/c under its control, important from a safety perspective. And, in the event ATC needs to make an emergency/urgent transmission while another a/c is transmitting, we can "drown" out that transmission and make our urgent transmission by "stepping on" the currently occurring transmission.

Finally, airlines' financial need to optimize efficiency does increase the risk of something going wrong, but that can be found in many aspects of the operation (for example, the decision to fly with less than full fuel on every flight (see Mentour's Singapore airline video). We can absolutely make the system safer by applying greater separation and increasing delay in the system (one in, one out?), flying with full fuel, etc., but that would come at increased cost to the consumer, which has not proven to be popular. In this case, the multiple layers of aviation security, which included the 777 pilots awareness of the situation ahead of them and recognizing that the preceding departure they were to follow had not gotten airborne and that they were closing on them instead of having increasing separation, and taking the appropriate action. worked.

Apologies if this was too long or previously addressed.

[hughmungus]

I have a suggestion for another video: how passengers can be inadvertently left aboard planes after they land. The same airport, Pearson International in Toronto, had an incident a few years back where a woman who was asleep in her seat was missed by the cabin crew when they disembarked the passengers. The other passengers left the plane and then the cabin crew and pilots left and none of them saw this woman still asleep in her seat. Eventually, she woke up and found herself in a dark, unheated plane; it was winter and after dark. The plane was no longer connected to the terminal - it had been towed away to a parking area - and the doors were all closed. The woman tried to phone the airport but her phone battery was almost dead and she wasn't able to clearly explain her situation before the phone died. If I remember correctly, she finally got noticed because she managed to figure out how to open one of the doors and then shouted for help through the open door and someone driving a baggage carrier heard her and came to the rescue. I don't know how frequently such things happen but I thought it might make a good topic for a video if it is not a one-in-a-billion fluke. After all, any of us might find ourselves in such a situation and might benefit from advice on what we should do if it happens.

[SRFriso]

The pilots of the 777 definitely made the right call. Would they have had enough runway to take off? Maybe. Would they have had enough vertical clearance with the tail of the Embrear? Maybe. Would you want to gamble almost 500 lives on a maybe? Definitely not.

[MandoMonge]

Before I used to love watching NatGeo’s air crash investigations, but now I can’t stand them.

I got spoiled by Peter’s incredible explanations, context of systems and how it all comes together in easy to understand pieces of information.

The standards are quite high and I’m glad I’m constantly following this series in your channel

[cuchitp]

I can’t wait for you analyse the recent LATAM airplane accident in Peru, where a firefighters drill, ended up with them entering the runway where a plane was just getting ready to take off, and crashing with the plane. It was a miracle that only two people sadly passed, but the Peruvian management of these events really make you wonder about their professionalism