WPvsMW
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Safety stand for wheel change?

Thu Jan 09, 2020 7:42 pm

What's missing from this picture? (no... not underwear coverage)
https://en.wikipedia.org/wiki/Aircraft_ ... 000301.jpg
 
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fr8mech
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Re: Safety stand for wheel change?

Thu Jan 09, 2020 8:54 pm

Nothing is missing. We don’t use stands while replacing tires*. Now, I will make a note, that I’ve never, nor would I condone having both nose tires off at the same time, unless we’re in the barn. Though, I don’t think there is a prohibition against it in the AMM. I’ll look tonight.

*as always, I will add the disclaimer that there is almost nothing that is absolute in aircraft maintenance. There may be a requirement somewhere, on some aircraft, that a stand be used. I just haven’t seen it in 30+ years.
When seconds count...the police are minutes away.
Unless it's expressly prohibited, it's allowed.
You are not entitled to a public safe space.
Ego Bibere Capulus, Ut Aliis Sit Vivere
 
strfyr51
Posts: 4148
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Re: Safety stand for wheel change?

Thu Jan 09, 2020 10:15 pm

WPvsMW wrote:
What's missing from this picture? (no... not underwear coverage)
https://en.wikipedia.org/wiki/Aircraft_ ... 000301.jpg

there isn't anything missing. I used the same type of Jack in replacing 737 200 nose tires, though it must have been on a short turn as It certainly doesn't take 2 guys to change Nose tires. For that matter? Main Tires. I'd bet they have the mains chocked and the Parking Brakes set. I would not have both Nose Tires off with a jetway up or the possibility of a catering or cleaning truck up to the side of the airplane as that could really ruin your day.
 
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fr8mech
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 12:57 am

fr8mech wrote:
Though, I don’t think there is a prohibition against it in the AMM. I’ll look tonight.


All of our Boeing aircraft have this or some variation of this warning:

WARNING: IT IS RECOMMENDED THAT YOU REMOVE ONLY ONE WHEEL/TIRE ASSEMBLY FROM THE NOSE GEAR AT A TIME. IF YOU REMOVE THE TWO WHEEL/TIRE ASSEMBLIES FROM THE NOSE GEAR AT THE SAME TIME, STRUCTURAL DAMAGE AND/OR INJURY TO PERSONS CAN OCCUR IF THE AIRPLANE FALLS.

The McBoeing and the Airbus do not have a warning, caution or note.
When seconds count...the police are minutes away.
Unless it's expressly prohibited, it's allowed.
You are not entitled to a public safe space.
Ego Bibere Capulus, Ut Aliis Sit Vivere
 
WPvsMW
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 1:55 am

Good points... what is missing is one wheel still on the nose gear strut.
 
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fr8mech
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 5:10 am

WPvsMW wrote:
Good points... what is missing is one wheel still on the nose gear strut.


Only if the AMM says one should be there.
When seconds count...the police are minutes away.
Unless it's expressly prohibited, it's allowed.
You are not entitled to a public safe space.
Ego Bibere Capulus, Ut Aliis Sit Vivere
 
Lpbri
Posts: 201
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 5:10 am

I don't see a streamer for the nose gear down knock pin.
 
Lpbri
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 5:16 am

There doesn't appear to be a thread protector on the r/h axle
 
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Starlionblue
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 8:58 am

Lpbri wrote:
I don't see a streamer for the nose gear down knock pin.


The downlock pin could be mounted inside the well, and maybe the streamer is not visible.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
basspaul
Posts: 11
Joined: Fri Jan 26, 2018 8:18 pm

Re: Safety stand for wheel change?

Fri Jan 10, 2020 3:05 pm

what's missing: a longer shirt or suspenders for the guy on the left! (I too need these at times).
 
WPvsMW
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 6:28 pm

That's called "the plumber look", but was technically excluded from consideration in post #1.
 
WPvsMW
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 6:38 pm

Starlionblue wrote:
Lpbri wrote:
I don't see a streamer for the nose gear down knock pin.


The downlock pin could be mounted inside the well, and maybe the streamer is not visible.

The downlock pin and streamer on all BDs (including the CR700 in the pix) are in a visible location ... but the streamer could be short, damaged, or missing (bad, but not as bad as no pin, and no pin hasn't been ruled out, but staggers the imagination for an AMT working on a commercial a/c).
pdf page 20 (numbered page 1-15) of the TTM for the CR700:
https://www.antndigicast.com/_viddocs/c ... sample.pdf

Here's a BD-700 pix.
https://www.flickr.com/photos/a380spotter/7569281438
Very visible even with the same, high, port-side insertion as the CR700
 
WPvsMW
Topic Author
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 8:21 pm

Is the "flange" in the tire outboard sidewall in that BD-700 pix designed to keep water away from the axle, or does it have a different function? No flange on the inboard sidewall.
https://www.flickr.com/photos/a380spotter/7569281438
 
Lpbri
Posts: 201
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 8:35 pm

Just to nitpick further, it looks like they used the torque wrench to loosen the axle nut instead of a breaker bar. The Feds have tagged people for this by watching from the terminal.
 
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fr8mech
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Re: Safety stand for wheel change?

Fri Jan 10, 2020 8:59 pm

WPvsMW wrote:
Is the "flange" in the tire outboard sidewall in that BD-700 pix designed to keep water away from the axle, or does it have a different function? No flange on the inboard sidewall.
https://www.flickr.com/photos/a380spotter/7569281438


On the B727 the chines on the tires were designed to keep water spray from the nose out of the engines.

I would images they serve the same function here.
When seconds count...the police are minutes away.
Unless it's expressly prohibited, it's allowed.
You are not entitled to a public safe space.
Ego Bibere Capulus, Ut Aliis Sit Vivere
 
WPvsMW
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Re: Safety stand for wheel change?

Sat Jan 11, 2020 9:32 am

The chines are more effective for engines on wing pylons, I would think, than on fuselage-mounted podded engines.
The chines could also keep water off the wings, as in not diluting de-icing fluid on the wings.
 
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fr8mech
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Re: Safety stand for wheel change?

Sat Jan 11, 2020 10:02 am

WPvsMW wrote:
The chines are more effective for engines on wing pylons, I would think, than on fuselage-mounted podded engines.
The chines could also keep water off the wings, as in not diluting de-icing fluid on the wings.


The chines are there to minimize engine water ingestion. Unfortunately, I don't have access to the maintenance manuals or flight manuals anymore. Else, I would post the reference.

You can kind of see it here.

http://www.youtube.com/watch?v=neb1ls2YVzI

Unfortunately, I can't find the videos I saw during training.

Edit: Here you go:

Look at 14:25

http://www.youtube.com/watch?v=uni6HVfthKs
When seconds count...the police are minutes away.
Unless it's expressly prohibited, it's allowed.
You are not entitled to a public safe space.
Ego Bibere Capulus, Ut Aliis Sit Vivere
 
WPvsMW
Topic Author
Posts: 2230
Joined: Thu Mar 23, 2017 7:30 pm

Re: Safety stand for wheel change?

Sat Jan 11, 2020 6:40 pm

Thanks for that link. Chined tires make quite a difference on the B727 ... but it appears the chines are specific to fuselage mounted podded engines since they displace water away from the pods and toward the wing pylon areas.

Is that a full double-decker model of the B747 in the wind tunnel at 33:43?

A hybrid B-52/747 at 35:35 ... on a leased B-52.

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