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LAX772LR
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Joined: Sun Nov 09, 2014 11:06 pm

VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 9:10 am

Seen plenty of landing gear cams before, but never one from this perspective.

Figured some of you may enjoy it!

https://www.youtube.com/watch?v=7Y3lpgbTu6k
 
PeteKMCFC
Posts: 41
Joined: Sat Jul 29, 2017 7:25 pm

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 10:10 am

Thanks for sharing! Fascinating to see from that angle
 
Gr8Circle
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Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 12:44 pm

Interesting to see how the wheels stop spinning seconds before retraction....I always thought that they continue spinning for a while even after fully retracted....
 
jetskipper
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Joined: Tue Jun 12, 2001 1:50 am

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 1:07 pm

Gr8Circle wrote:
Interesting to see how the wheels stop spinning seconds before retraction....I always thought that they continue spinning for a while even after fully retracted....


Depending on the aircraft, most apply brake pressure to the main gear wheels when selected up. There are a lot of systems with components in the wheel well, for instance: fuel lines, hydraulic lines and accumulators, flap motors, flight control cables, fire bottles, just to name a few. The threat is that a damaged tire is still spinning while it is retracted into the well and wreaks havoc on the accessible systems. The nose wheel on the other hand usually just comes in contact with a rubber brake or snubber when retracted which stops rotation mechanically.
 
ReverseFlow
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Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 1:37 pm

jetskipper wrote:
Gr8Circle wrote:
Interesting to see how the wheels stop spinning seconds before retraction....I always thought that they continue spinning for a while even after fully retracted....


Depending on the aircraft, most apply brake pressure to the main gear wheels when selected up. There are a lot of systems with components in the wheel well, for instance: fuel lines, hydraulic lines and accumulators, flap motors, flight control cables, fire bottles, just to name a few. The threat is that a damaged tire is still spinning while it is retracted into the well and wreaks havoc on the accessible systems. The nose wheel on the other hand usually just comes in contact with a rubber brake or snubber when retracted which stops rotation mechanically.
It's also the gyroscopic effects.

I was wondering - the 737 and ithers don't retract the wheels fully into the bay and have a door close on it.
On this video you can see the right gear doesn't seal fully as you can see a bit if light.

How much drag and especially noise does this make?
Obviously not enough to change the design (that would be a huge change)
 
889091
Posts: 663
Joined: Sat Apr 06, 2019 7:56 pm

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 2:46 pm

Looks scary, even on video.

Which makes this even scarier!
https://interestingengineering.com/a-st ... wheel-well

I guess desperate people will do desperate things.
 
wingman
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Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 3:11 pm

ReverseFlow wrote:
On this video you can see the right gear doesn't seal fully as you can see a bit if light.

How much drag and especially noise does this make?
Obviously not enough to change the design (that would be a huge change)


I noticed that too. It can't be the spec as designed so I'm guessing it's some bits that need replacing causing that imperfect seal.
 
slvrblt
Posts: 413
Joined: Tue Dec 28, 2004 11:19 pm

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 3:54 pm

Cool video! thanks, LAX772LR
 
B757Forever
Posts: 997
Joined: Tue May 04, 2010 3:23 am

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 4:03 pm

wingman wrote:
ReverseFlow wrote:
On this video you can see the right gear doesn't seal fully as you can see a bit if light.

How much drag and especially noise does this make?
Obviously not enough to change the design (that would be a huge change)


I noticed that too. It can't be the spec as designed so I'm guessing it's some bits that need replacing causing that imperfect seal.


Those flap seals on the 737 are a common replacement item for aircraft during scheduled checks.
 
SEAorPWM
Posts: 262
Joined: Fri Jun 11, 2021 8:41 pm

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 4:36 pm

Being someone who has delved into the joys of EWIS in the past, the biggest thing that blows my mind is how solid those hydraulic lines and hoses seem to be. I can't even detect the slightest hint of vibration in those or any wire bundles routed around them. :veryhappy:
 
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LAX772LR
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Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 8:09 pm

slvrblt wrote:
Cool video! thanks, LAX772LR

No prob.

Here's the landing, from the same cam, if y'all wanted to see. It's pretty cool, seeing as the approach is over the Indian Ocean.

https://www.youtube.com/watch?v=9w6HOT35JMA
 
B757Forever
Posts: 997
Joined: Tue May 04, 2010 3:23 am

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 8:45 pm

SEAorPWM wrote:
Being someone who has delved into the joys of EWIS in the past, the biggest thing that blows my mind is how solid those hydraulic lines and hoses seem to be. I can't even detect the slightest hint of vibration in those or any wire bundles routed around them. :veryhappy:


All the plumbing in the wheel well is designed to withstand a tire that explodes after retraction. Oddly enough, bias ply and radials tires exert forces differently when they explode. When we converted our 737-800 fleet from bias to radial tires, a part of the mod was to replace specific hydraulic lines in the wheel wells with heavier wall tubing to be compatible with the radial tire failure characteristics.
 
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nstampede002
Posts: 34
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Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 9:03 pm

jetskipper wrote:
Gr8Circle wrote:
Interesting to see how the wheels stop spinning seconds before retraction....I always thought that they continue spinning for a while even after fully retracted....


Depending on the aircraft, most apply brake pressure to the main gear wheels when selected up. There are a lot of systems with components in the wheel well, for instance: fuel lines, hydraulic lines and accumulators, flap motors, flight control cables, fire bottles, just to name a few. The threat is that a damaged tire is still spinning while it is retracted into the well and wreaks havoc on the accessible systems. The nose wheel on the other hand usually just comes in contact with a rubber brake or snubber when retracted which stops rotation mechanically.


Just to expound a bit more: there is a frangible fitting on the bottom of the wing-to-body fairing on the B737 (NG at least) that in the event a tire is experiencing tread separation AND still makes it near the wheel well, that spinning tire tread will shear the fitting off and that will remove hydraulic power from the retract cylinder (slight amount of fluid overboard - a hydraulic fuse isolates the rest of the system) to prevent the landing gear from retracting any further (gravity takes over and that landing gear assumes down and locked position). This would prevent said tire from getting into the wheel well and possibly ending up stuck due to the tire tread trying to liberate itself.
Last edited by nstampede002 on Sun May 01, 2022 9:10 pm, edited 2 times in total.
 
Fixinthe757
Posts: 296
Joined: Thu Oct 17, 2013 10:48 am

Re: VIDEO: landing gear from roll to retraction, from inside bay

Sun May 01, 2022 9:08 pm

Another reason the brakes are applied at gear retraction (~500 psi) is the tires expand while rolling, so stopping the tires brings them back to their normal size so they can enter the wheel well without contact with anything
 
F9Animal
Posts: 4820
Joined: Thu Dec 16, 2004 7:13 am

Re: VIDEO: landing gear from roll to retraction, from inside bay

Mon May 02, 2022 7:20 am

LAX772LR wrote:
Seen plenty of landing gear cams before, but never one from this perspective.

Figured some of you may enjoy it!

https://www.youtube.com/watch?v=7Y3lpgbTu6k


That is awesome! Gets me to thinking. I wonder if airlines would consider doing cameras like this that pilots can access when troubleshooting a problem? This view would be great for a situation the gear doesn't show down.

Technology is just still blowing me away.
 
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LAX772LR
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Re: VIDEO: landing gear from roll to retraction, from inside bay

Mon May 02, 2022 8:43 am

F9Animal wrote:
I wonder if airlines would consider doing cameras like this that pilots can access when troubleshooting a problem? This view would be great for a situation the gear doesn't show down.

That's actually a pretty good idea... I wonder why they don't.

That could've been extremely helpful in an incident like FX1026:
https://www.youtube.com/watch?v=4IgAbGk7Jy4
 
RobertS975
Posts: 1057
Joined: Sun Aug 14, 2005 2:17 am

Re: VIDEO: landing gear from roll to retraction, from inside bay

Mon May 02, 2022 11:02 pm

Visually down doesn't mean locked!
 
basspaul
Posts: 75
Joined: Fri Jan 26, 2018 8:18 pm

Re: VIDEO: landing gear from roll to retraction, from inside bay

Mon May 02, 2022 11:14 pm

wingman wrote:
ReverseFlow wrote:
On this video you can see the right gear doesn't seal fully as you can see a bit if light.

How much drag and especially noise does this make?
Obviously not enough to change the design (that would be a huge change)


I noticed that too. It can't be the spec as designed so I'm guessing it's some bits that need replacing causing that imperfect seal.


It's not designed to be a perfect seal, it's a brush seal. Just there to help smooth the surface by filling in the gap from the belly fairing to the wheels.

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