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Dear friends and followers, welcome back to my channel!
A Folding Wingtip?! Is it safe? 777X wing explained. WHY and HOW?! | by Captain Joe
Dear friends and followers welcome back to my channel and lovely greetings from the Cargolux maintenance hangar, in the background the beautiful 747 - but we are not going to looking at 747 today, instead we’ll talk about the plane which is most likely going revolutionize aviation industry, the brand new Boeing 777 X specifically focusing on the foldable wingtips!
To be fair this isn’t the first time we have seen this in aviation, foldable wings and wingtips are very common among fighter jets to make more space on aircraft carriers but she will be the first commercial plane able to fold her wingtips. We'll be focusing on how does it work, what the pilots have to do to, is it safe and reliable, and more importantly, why is it suddenly a new feature on today’s passenger aircraft?
Let's fold away and let's get started!
I'm sure many of you have seen the recent take-off and landing of Boeings new triple 777X at Paine field in Everett. Essentially, it’s the latest model of the triple 777, set to replace the classic triple seven which has been around since 1994, whilst competing with Airbus’ equivalent aircraft, the A350-900 and 1000.
Visually there are a number of big changes we are seeing on this aircraft and besides those absolutely humongous engines, the other significant difference are the foldable wingtips.
At the tip of these gigantic 777x carbon fibre wings, we find the folding wingtip. Once the aircraft is powered up the hydraulic actuators are able to rotate the tip from the taxi position to the inflight position. Once the wingtips are in place they are locked in by an electrical locking mechanism which holds the tips in place during flight.
Now, this is just an assumption of mine but from a technical standpoint, I'm pretty sure that the electrical lock is connected to the "wheels on ground sensor", meaning the wingtips can not fold upwards during flight and secondly no electrical power is needed to hold them in place in case there is some kind of electrical power loss in flight. And a similar principle for the hydraulic actuator, you need hydraulic pressure to fold it upwards and little to no pressure to keep them extended in case of a hydraulic issue. Compare it to the landing gear, hydraulic pressure to keep it up, but no pressure needed to extend it, making the system independent.
Also the leading edge of the foldable wingtip is electrically heated to prevent ice from accumulating and is turned on with the wing anti-ice switch on the overhead panel.
So what's new for the pilots.
Well, there will be a new switch added to the overhead panel and a little animation of the wingtips will be shown on the upper EICAS display.
So as the pilot's taxi towards the holding point, being clear of any obstacles, they place the Wingtip switch from folded to extended.
This action is then cross-checked on the EICAS displaying the tips in transit, from folded to extended, whilst lining up on the runway.
Now the master warning will go off and the "Take-Off configuration“- warning will be displayed in red if the pilots advance the thurst levers for take-off whilst the wingtips are still in transit. It's the same warning you would get in case of incorrect take-off flap setting for example.
Upon landing, the wingtips automatically fold upwards once the groundspeed is less then 50kts. Should there be a malfunction during the folding procedure it will be relayed to the pilots via the master caution light and audible tone.
Thank you very much for your time! I hope you enjoy this video!
Wishing you all the best!
Your "Captain" Joe
Big thank you to all other youtubers who provided me with the video material to create this video. Your content is highly appreciated. Please follow their channels:
@Boeing
@Motion Photoz By Liza
@Ed Whisenant
@Cargospotter
@BostonAirborne
@railnwings
@samchui
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