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basspaul
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Posts: 75
Joined: Fri Jan 26, 2018 8:18 pm

My son is asking: AC 811 LIS-YYZ diversion to YUL on May 14

Sun May 15, 2022 2:00 pm

My son was spotting planes on Flightradar24 yesterday and noticed AC811 diverted to Montreal. It was met with several ground vehicles on the runway and appeared to have been towed to the terminal. It was on the runway for 15-20 minutes.

This morning, the outbound AC810 from Toronto to Lisbon has been cancelled. I assume the aircraft is at AC's maintenance at YUL.

My son would like to ask the internet hive mind if we know what happened.
 
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CrewBunk
Posts: 432
Joined: Sat Nov 18, 2017 3:12 am

Re: My son is asking: AC 811 LIS-YYZ diversion to YUL on May 14

Sun May 15, 2022 2:34 pm

basspaul wrote:
This morning, the outbound AC810 from Toronto to Lisbon has been cancelled. I assume the aircraft is at AC's maintenance at YUL.


Now operating as AC2100, with a replacement aircraft.
 
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AirKevin
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Joined: Wed Apr 26, 2017 2:18 am

Re: My son is asking: AC 811 LIS-YYZ diversion to YUL on May 14

Mon May 16, 2022 8:39 pm

According to this, it diverted for landing gear issues.

https://www.youtube.com/watch?v=a2HE-UsQRbo
 
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CrewBunk
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Re: My son is asking: AC 811 LIS-YYZ diversion to YUL on May 14

Tue May 17, 2022 2:27 am

AirKevin wrote:
According to this, it diverted for landing gear issues.

Green system hydraulic low pressure.
 
basspaul
Topic Author
Posts: 75
Joined: Fri Jan 26, 2018 8:18 pm

Re: My son is asking: AC 811 LIS-YYZ diversion to YUL on May 14

Wed May 18, 2022 10:28 pm

Why would a low pressure on green require a rollout of the fire crews who were apparently interested in the brake temps? Does a low green mess up the braking performance? Or does the pilot have to brake harder with the low pressure?
 
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CrewBunk
Posts: 432
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Re: My son is asking: AC 811 LIS-YYZ diversion to YUL on May 14

Wed May 18, 2022 11:53 pm

basspaul wrote:
Why would a low pressure on green require a rollout of the fire crews who were apparently interested in the brake temps? Does a low green mess up the braking performance? Or does the pilot have to brake harder with the low pressure?

A green hydraulic low pressure is the first warning to the pilots. On that warning, they initiated a diversion to YUL. (Note, that was a decision made by the Captain. They could have legally continued to YYZ with two remaining functioning systems).

It was followed by a green hydraulic low fluid level warning, indicating (correctly) a leak.

An approach and landing with green system inop requires special attention. First of all an emergency gear extension must be made. (You can see in the pictures, the gear doors are left open, a result of the emergency extension). Nose wheel steering will be inop as well, requiring a tow to the gate. Also, primary braking is lost, and they landed using alternate braking without antiskid. Spoilers 1 and 5 will be inop on each wing.

However, full reverse is available on both engines and flaps and slats are available as well, albeit slow.

All considered therefore, an emergency would have been declared with ATC. This brings the emergency response vehicles out and per their SOPs they would be assessing brake temperatures and looking for leaks, following the aircraft to the gate.

This is a common simulator exercise and appears to be handled well. (F/Os get a single hydraulic failure, Captains get a dual hydraulic failure in the simulator).
 
basspaul
Topic Author
Posts: 75
Joined: Fri Jan 26, 2018 8:18 pm

Re: My son is asking: AC 811 LIS-YYZ diversion to YUL on May 14

Thu May 19, 2022 12:06 am

Thanks. I'll get the update to my son!

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