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Topic: How Do You Change A Wheel On An Airliner?
Username: Ajet
Posted 2005-05-07 15:47:53 and read 18760 times.

Silly question, but I'd like to know that:
how do you change a wheel on an airliner?
(I can't imagine they're using a jack!)

Thanks!

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Jwenting
Posted 2005-05-07 15:54:36 and read 18758 times.

Quoting Ajet (Thread starter):
(I can't imagine they're using a jack!)

why not?

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Geoffm
Posted 2005-05-07 16:21:59 and read 18746 times.

Certainly looked like it to me when I saw them changing not one but two wheels on an inbound HKT - and we had the same captain going to BKK! (The landing at BKK was actually the best I've ever had...).

Not your usual car jack but a a jack nonetheless. Sort of cage thing. A300 if that makes any difference.

Geoff M.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: LeonB1985
Posted 2005-05-07 18:49:51 and read 18721 times.

I've seen it happen on a LY B747-400 which burst a tyre on landing at LHR. By the time they had towed the aircraft from the end of 27L to its stand, there was a 'wheel change vehicle' with a new tyre ready and waiting. Can't remember exactly what was done, but it was changed pretty fast and I don't think there was any significant delay to the departure back to TLV.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: EMBQA
Posted 2005-05-07 19:25:24 and read 18717 times.

It's just like changing a tire on a car. You jack it, remove the 'lug nut', remove the old tire...put on the new tire, tighten the 'lug nut' lower the jack. Most aircarft tires are held on by a single large splined nut which is locked on by retaining bolts and then safety wired. Here are several pictures from several different types of planes, but as you see the process in nearly identical....


View Large View Medium
Click here for bigger photo!

Photo © Tim de Groot - AirTeamImages


View Large View Medium
Click here for bigger photo!

Photo © Geir Løitegård


View Large View Medium
Click here for bigger photo!

Photo © Justin Cederholm



[Edited 2005-05-07 19:40:14]

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: AJet
Posted 2005-05-07 22:47:01 and read 18656 times.

Thanks to you all, and especially to EMBQA for these well-chosen pictures. I just couldn't believe before seeing it, that you could actually jack the front gear of a jumbo jet!

Ajet

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Kerberos
Posted 2005-05-08 07:44:24 and read 18564 times.

Haha:


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Click here for bigger photo!

Photo © Justin Cederholm



This pic made me laugh... You've got to be careful where you park your 747 these days.... bastards will stop at nothing to steal your wheels

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: OzLAME
Posted 2005-05-08 08:51:47 and read 18541 times.

On the Swearingen/Fairchild Metro series and the SAAB 340 it is permissable to put a small ramp in front of the wheel next to the one you are changing and tow the aircraft up onto it, this gets the wheel to be changed off the ground very quickly and easily.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-08 10:58:51 and read 18524 times.

Quoting LeonB1985 (Reply 3):
I've seen it happen on a LY B747-400 which burst a tyre on landing at LHR. By the time they had towed the aircraft from the end of 27L to its stand, there was a 'wheel change vehicle' with a new tyre ready and waiting. Can't remember exactly what was done, but it was changed pretty fast and I don't think there was any significant delay to the departure back to TLV.

A Tyre burst & towed,would necessate extra load on the remaining tyres.
On the B737s if An Aircraft is towed or has rolled with one flat tire,the Adjacent wheel is also replaced as its likely to have been loaded abnormally.

regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: JHSfan
Posted 2005-05-08 11:52:55 and read 18505 times.

Doing it the Halliburton way... you don't. Just buy a new airliner and send the bill to the owner of the old one.

- JHSfan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Jamie757
Posted 2005-05-09 01:13:54 and read 18413 times.

Quoting Kerberos (Reply 6):
Haha



This pic made me laugh... You've got to be careful where you park your 747 these days.... bastards will stop at nothing to steal your wheels

This picture was taken in Manchester? Right?

Rgds.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: KC135R
Posted 2005-05-09 01:20:06 and read 18406 times.

Quoting EMBQA (Reply 4):
It's just like changing a tire on a car. You jack it, remove the 'lug nut', remove the old tire...put on the new tire, tighten the 'lug nut' lower the jack. Most aircarft tires are held on by a single large splined nut which is locked on by retaining bolts and then safety wired. Here are several pictures from several different types of planes, but as you see the process in nearly identical....

Do you know if any civilian airplanes have anything like the integral jacking found on the C-17? It seems like a good idea.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Air2gxs
Posted 2005-05-09 02:30:08 and read 18385 times.

I know of no civilian airliners that have integral jacking. The weight penalty would be too severe. The C-17 has the advantage of being able to refuel in flight, which allows it a higher basic operating weight.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: EMBQA
Posted 2005-05-09 03:20:05 and read 18364 times.

KC135-

None that I know about. I'm sure it was added to the C-17 as part of the design contract. I'm guessing it was added to the aircraft so it could be maintained at airfields with little to no GSE.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: RayBolt
Posted 2005-05-09 05:03:09 and read 18342 times.

NW had to change a DC9 tire up here in GFK last year. The comment on the photo describes the situation, but the pilots felt something while taxiing, and NW had to fly a mx crew up for the change.


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Click here for bigger photo!

Photo © Timothy Hannan



dan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Silver1SWA
Posted 2005-05-10 19:52:29 and read 18195 times.

Saw WN's line mx guys at LAX replace a wheel on the main gear during the turn. Only caused a 5-10 minute delay. Other than that, the turning of the aircraft went as normal. That impressed me...

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-11 10:41:26 and read 18104 times.

Wheel change with all tools ready can be done in Ten minutes [during transit time of 30 minutes].
I think Brake change during Transit is tougher due Temperatures Involved  Smile
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: StealthZ
Posted 2005-05-11 11:49:47 and read 18088 times.

Quoting KC135R (Reply 11):
Do you know if any civilian airplanes have anything like the integral jacking found on the C-17?

I'm no expert but this is easier to do on transports with kneeling gear..
Does it have self jacking or do they put stand under A/C then kneel the gear? That seems to me the easy way.

Some Citroen cars had a similar capability.

Rgds

Chris

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: JumboJim747
Posted 2005-05-11 12:12:40 and read 18083 times.

Quoting HAWK21M (Reply 8):
A Tyre burst & towed,would necessate extra load on the remaining tyres.
On the B737s if An Aircraft is towed or has rolled with one flat tire,the Adjacent wheel is also replaced as its likely to have been loaded abnormally

MEL would it not make sence to change both anyway as the tred patern or the uneven wear between the new and old tyre be unbalanceing to the aircraft.?

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-11 13:51:02 and read 18062 times.

Quoting JumboJim747 (Reply 18):
MEL would it not make sence to change both anyway as the tred patern or the uneven wear between the new and old tyre be unbalanceing to the aircraft.?

Not necessary.Uneveness more likely to affect NLG more than MLG.
Unless there is a very big difference in the condition of adjacent Tires.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: UAL Bagsmasher
Posted 2005-05-11 15:02:56 and read 18051 times.

I have heard stories of aircraft whose nose gears are canted forward, having their nose tires changed without jacking. You turn the nosegear fully in one direction or the other. The result is that one of the two nose tires actually leaves the ground without the use of a jack. You can see this on a DC-10 in a sharp turn. Only one nose wheel is touching the ground. A tire change in this manner can't really be safe, but I've heard of it being done.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: MD11Engineer
Posted 2005-05-11 16:02:43 and read 18045 times.

Quoting UAL Bagsmasher (Reply 20):
I have heard stories of aircraft whose nose gears are canted forward, having their nose tires changed without jacking. You turn the nosegear fully in one direction or the other. The result is that one of the two nose tires actually leaves the ground without the use of a jack. You can see this on a DC-10 in a sharp turn. Only one nose wheel is touching the ground. A tire change in this manner can't really be safe, but I've heard of it being done.

You can do this on an MD-11.

Usual procedure for changing wheel (generic):

1) Jack wheel up (often you´ll use an air powered jack and just take the air from the old tyre). At the same time it will deflate the tyre (necessary for safety reasons)
2) remove hub cap
3) Remove safety bolt on axle nut
4) remove axle nut
5) remove axle washer (if installed, the A300-600 doesn´t use them)
6) put on axle thread protector
7) set parking brake
8) depending on size of wheel either slide old wheel off by hand or use wheel trolley
9) clean axle and axle spacer of old grease and inspect axle and brake unit for damage
10) put a little high temperature grease on bearing surfaces of axle and spacer (we use Grease
28)
11) Reinstall axle spacer
12) slide on new wheel
13) Install axle washer and loosely install axle nut
14) release parking brake
15) while one person turns the wheel, the other person pretorques the axle nut (to set the
bearings)
16) release axle nut
17) while one person turns the wheel torque axle nut to final torque
18) Install and safety safety bolt.
19) install hub cap
20) Check tyre pressure
21) dejack plane
22) do paperwork and sign off in log book.


Jan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: 242
Posted 2005-05-11 16:30:54 and read 18026 times.

Quoting UAL Bagsmasher (Reply 20):
I have heard stories of aircraft whose nose gears are canted forward, having their nose tires changed without jacking. You turn the nosegear fully in one direction or the other. The result is that one of the two nose tires actually leaves the ground without the use of a jack. You can see this on a DC-10 in a sharp turn. Only one nose wheel is touching the ground. A tire change in this manner can't really be safe, but I've heard of it being done.

This works on the entire DC-9 family as well as the ATR-72.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: OzLAME
Posted 2005-05-11 22:54:27 and read 17966 times.

Quoting HAWK21M (Reply 19):
Quoting JumboJim747 (Reply 18):
MEL would it not make sence to change both anyway as the tred patern or the uneven wear between the new and old tyre be unbalanceing to the aircraft.?

Not necessary.Uneveness more likely to affect NLG more than MLG.
Unless there is a very big difference in the condition of adjacent Tires.
regds
MEL

I can't speak for other larger aircraft but on the SAAB 340 you have to change the nose wheels as a pair to prevent nose wheel shimmy. As pointed out above, it isn't necessary to change MLG wheels in pairs.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Jfkaua
Posted 2005-05-12 03:51:30 and read 17920 times.

just a quick question.. on that picture with the 747 nose wheel jacked up.. isn't that putting a rather large amount of weight on a pretty small space? It looks like the space where it hits the ground couldn't be more then 10"x10"

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: L-188
Posted 2005-05-12 04:18:47 and read 17938 times.

Quoting OzLAME (Reply 7):
On the Swearingen/Fairchild Metro series and the SAAB 340 it is permissable to put a small ramp in front of the wheel next to the one you are changing and tow the aircraft up onto it, this gets the wheel to be changed off the ground very quickly and easily.

Correct, seen this procedure quite a few times.

Otherwise the jack is needed.

When I worked for Reeve out in the Bush they stockpiled some assembled mainwheels for the Electras and 727's, and a jack, in case they where needed.

Never where the whole time I was there.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: OzLAME
Posted 2005-05-12 04:42:14 and read 18119 times.

Quoting Jfkaua (Reply 24):
just a quick question.. on that picture with the 747 nose wheel jacked up.. isn't that putting a rather large amount of weight on a pretty small space? It looks like the space where it hits the ground couldn't be more then 10"x10"

Consider the footprint of the nose wheel tyres; it's not too much more than that.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-12 05:50:28 and read 18132 times.

Is the Replaced Tire deflated prior to installation & recharged after Installation.
How is it done at your area.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Air2gxs
Posted 2005-05-12 14:45:32 and read 18086 times.

Quoting HAWK21M (Reply 27):
Is the Replaced Tire deflated prior to installation & recharged after Installation.
How is it done at your area.

We always deflate the wheel assembly before removing it, but the servicible unit comes inflated, we just top it off.

One reason to deflate, is safety. You really do not know the condition of the wheel assembly coming off. If several tie bolts have fractured, it may be the axle nut that's holding the tire together. Never seen that before, but it's definetely within the realm of possibility.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-12 18:09:25 and read 18043 times.

Quoting Air2gxs (Reply 28):
We always deflate the wheel assembly before removing it, but the servicible unit comes inflated, we just top it off

Out here Even the New Replacement serviceable wheel is recvd with reduced pressure to avoid Injury during Transport.After it has been installed,it is topped up to required pressure.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: UAL Bagsmasher
Posted 2005-05-13 05:53:39 and read 17985 times.

When performing a brake change, and not changing the tire, is it your practice to deflate the MLG tire before removal and top it off after the brake change? Or do you just remove and re-install the tire fully inflated to change a brake assy.?

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-13 06:07:12 and read 17981 times.

Quoting UAL Bagsmasher (Reply 30):
When performing a brake change, and not changing the tire, is it your practice to deflate the MLG tire before removal and top it off after the brake change? Or do you just remove and re-install the tire fully inflated to change a brake assy.?

Everytime a Wheel is to be removed irrespective if during U/s Wheel replacement or Brake change facilatation,Deflating is a must.After Reinstallation of the Wheel,Tire is again recharged.
Its a precaution in case of Damaged Hub bolts.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: A/c train
Posted 2005-05-13 17:18:16 and read 17956 times.

As Hawk says, you should deflate the wheel before removing it for a brake change, people have been killed by not doing this, seriously. Also you shouldnt inflate the wheel until you have torqued it up on the axle, same reason, a couple of damaged tie bolts and it could explode on you as HAS happend before.
But im guilty of doing things the opposite way to this I must admit, im sure Airplay has inflated a wheel and taken it too the other side of the airport about 20 psi up too save him not going back for the N2 bottles !!
Whats important is knowing that if your doing a walk round and you spot a cracked tie bolt (especially on 757's) you will take the precaution too fully deflate it, when you change it, THATS common sense.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-13 17:22:41 and read 17951 times.

Quoting A/c train (Reply 32):
Whats important is knowing that if your doing a walk round and you spot a cracked tie bolt (especially on 757's) you will take the precaution too fully deflate it, when you change it

Why did you include the type ie 757.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Lemurs
Posted 2005-05-14 00:22:43 and read 17909 times.

Quoting A/c train (Reply 32):
Whats important is knowing that if your doing a walk round and you spot a cracked tie bolt (especially on 757's) you will take the precaution too fully deflate it, when you change it, THATS common sense.

Can you give an explanation on that? I guess I don't know the physical charactaristics of the wheel/tire to know how this is dangerous. I know that anything with that much weight and pressure is basically a bomb in containment, but I'm not sure I understand what the tie bolt is/does?

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: MD11Engineer
Posted 2005-05-14 01:06:47 and read 17919 times.

Because, unlike with cars, an aircraft rim consists of two halves, which are held together by the tie bolts. If the tie bolts are damaged, the axle nut can be the only thing holding the wheel together. Also, the pressure on a typical aircraft main tyre is in the 200 PSI range, about ten times as much as a car.The two rim halves are sealed against each other with an o-ring.

Jan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Kaddyuk
Posted 2005-05-14 12:44:39 and read 17882 times.

Quoting MD11Engineer (Reply 35):
Because, unlike with cars, an aircraft rim consists of two halves, which are held together by the tie bolts. If the tie bolts are damaged, the axle nut can be the only thing holding the wheel together. Also, the pressure on a typical aircraft main tyre is in the 200 PSI range, about ten times as much as a car.The two rim halves are sealed against each other with an o-ring.

Jan

I've seen wheels removed without deflating... saves time and effort... but as people have said, its highly dangerous...

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-14 19:11:21 and read 17855 times.

Quoting Kaddyuk (Reply 36):
I've seen wheels removed without deflating... saves time and effort... but as people have said, its highly dangerous...

Better Late than Never......Always Deflate prior to Wheel removal  Smile
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: ATCT
Posted 2005-05-28 23:00:38 and read 17619 times.

Ok I cant resist............Very Carefully :P


ATCT

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-29 10:56:56 and read 17576 times.

Have you ever tried Jacking the MLG axle to change Two Deflated tires on that side Gear.
Any practical Tips.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: MD11Engineer
Posted 2005-05-29 14:55:01 and read 17562 times.

Quoting HAWK21M (Reply 39):
Have you ever tried Jacking the MLG axle to change Two Deflated tires on that side Gear.
Any practical Tips.
regds
MEL

You mean two deflated tyres on the same axle? You�ll need a rhino jack, that can work with the little ground clearance.

Jan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Air2gxs
Posted 2005-05-29 15:30:28 and read 17558 times.

You need a Rhino Jack, also called a recovery jack. Basically the jack pad sits only about 2 or 3 inches of the ground. The jack stradles the gear and the ram is back with the body of the jack.

The first picture in this link, http://www.vpnavy.com/vp94_2003.html, shows the jack in use.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Dan2002
Posted 2005-05-29 17:54:12 and read 17535 times.

Quoting Air2gxs (Reply 41):
The first picture in this link, http://www.vpnavy.com/vp94_2003.html, shows the jack in use.

The link is http://www.vpnavy.com/vp94_2003.html ,you added a comma to the link. Interesting 404 error tho..

-Dan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-29 18:09:01 and read 17525 times.

Quoting MD11Engineer (Reply 40):
You�ll need a rhino jack, that can work with the little ground clearance.

What if thats not available.
Jan....Your posts seems to have a lot of i¿½.
What does it mean.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: MD11Engineer
Posted 2005-05-29 18:28:33 and read 17529 times.

It is a problem with the forum. If I type in an apostrophe ´ or the German characters ä, ö, ü and ß they get printed this way ä,ö,ü,ß, and ´ if I don´t reopen the post to rededit them.

Jan

[Edited 2005-05-29 18:29:07]

The funny think iws that they appear normal on the edit page.

Maybe something for Johann

[Edited 2005-05-29 18:30:13]

[Edited 2005-05-29 18:32:14]

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Air2gxs
Posted 2005-05-29 21:52:10 and read 17491 times.

Quoting HAWK21M (Reply 43):
What if thats not available

Your options are pretty limited to "use your imagination". We once towed the offending wheel set onto blocks of wood in order to raise the jack point. Need to be extremely careful doing that. It is real easy to exceed towbar limits when towing a aircraft with flat tires. It's not easy, but can be done.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-05-30 07:04:53 and read 17443 times.

Quoting Air2gxs (Reply 45):
We once towed the offending wheel set onto blocks of wood in order to raise the jack point.

That was the option available.But We preffered to Deflate the Oleo on the Affected gear,Tied the Scissor links together & raised the Aircraft slightly with the Wing Fuselage jack,getting sufficient clearence to Insert the Main Bottle Jack under the Axle.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Bongo
Posted 2005-05-31 23:53:21 and read 17336 times.

It is common even with passengers onboard... It happened to me last year in CDG on an AF B737 !!! I was on the window and I saw almost the whole procedure.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: IL76TD
Posted 2005-06-02 07:41:51 and read 17268 times.

IL-76's carry a small hydraulic jack about the size of 3 cereal boxes which can be used to change main or nose tires. All the aircraft travel with minimum one spare nose tire and one mlg tire, and if forward deployed for some time we will throw an extra mlg tire into the aircraft. Hub changes from old tire to new take about 10 minutes, and outer wheel changes take approximately :30, and a little more for inner mlg or inner nose gear changes.

Of course, considering an IL-76 has more landing gear than a 747, even if you blow up to half your gear tires...no problem.

They are also 13 ply tires, versus western tires that IIRC have only max 6 or 7 plys, this is why most non-knowledgable people look at IL-76 tires that have worn through 4 plys and think 'whoa, wouldn't want to fly on this' not realizing that there are still more ply's left than on a new boeing or airbus tire has.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-06-02 11:21:36 and read 17251 times.

Quoting IL76TD (Reply 48):
Of course, considering an IL-76 has more landing gear than a 747, even if you blow up to half your gear tires...no problem

What happens when the Aircraft rolls with deflated tires.Are the rest changed along with the u/s ones,as the load distribution has been affected.

Quoting IL76TD (Reply 48):
They are also 13 ply tires, versus western tires that IIRC have only max 6 or 7 plys

This is educational.What about the TU-204 tires.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: A/c train
Posted 2005-06-02 23:58:12 and read 17225 times.

the amount of fibbers replying on this topic !!
MD-11engineer, you typed out a wheel change procedure generic, but forgot too mention too release the parking brake before jacking. Naughty naughty !!! thats not what the CAA want too hear, we all release parking brakes, regardless of when wether on a slope.  Wink
regds a/c

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Air2gxs
Posted 2005-06-03 01:16:25 and read 17180 times.

Quoting A/c train (Reply 50):
MD-11engineer, you typed out a wheel change procedure generic, but forgot too mention too release the parking brake before jacking. Naughty naughty !!! thats not what the CAA want too hear, we all release parking brakes, regardless of when wether on a slope.
regds a/c

If I remember my maintenance manual correctly, and I may be wrong, the brakes must be released when jacking/de-jacking a dual tandem bogie or gear that is canted forward or aft.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: MD11Engineer
Posted 2005-06-03 02:20:24 and read 17154 times.

Sorry, my bad! I assumed that the plane was parked with parking brake off and wheels chocked, as it is standard for better brake cooling after landing.

Jan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-06-03 09:46:55 and read 17130 times.

How is the Brake held on a B777 Axle.I heard just One Antirotational Bolt/Nut.Can anyone confirm.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: IL76TD
Posted 2005-06-04 08:19:45 and read 17072 times.

hawk21m,

aircraft landing/rolling with one deflated tires makes no difference on an IL as all gear assembly's are 4 wide so the load balance isn't horribly off unlike 2 wide bogie.

don't know about TU204 tires, but most russian aircraft tires are designed for long wear in bad conditions, so I assume it is at least a 10 ply tire.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2005-06-04 19:26:29 and read 17040 times.

Quoting IL76TD (Reply 54):
don't know about TU204 tires, but most russian aircraft tires are designed for long wear in bad conditions, so I assume it is at least a 10 ply tire.

Any reason why Western Aircraft dont have such multiple ply for Commercial use.Is it Weight saving or better Landing strips.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: IL76TD
Posted 2005-06-05 05:22:29 and read 17006 times.

probably a little bit of both...

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Jeb94
Posted 2005-06-10 09:51:56 and read 16904 times.

Number of plys depends on tire manufacturer and the intended use of the tire. Many Russian aircraft are designed for rough fields. The airframes are rugged as is the tires because of this. Western aircraft on the other hand are built lighter and optimized for paved strips. When you look at western military transports you might notice that they too are generally ruggedly built for the same reasons. Their tires are also probably tougher (have more plys) than most civilian aircraft tires of the west.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: LouA340
Posted 2006-05-26 01:38:29 and read 16273 times.


View Large View Medium
Click here for bigger photo!

Photo © Justin Cederholm



Looking at the description for this picture it said the aircraft gave its spare tire to another 747 and so had to wait for another one.
I was just wondering, on a usual day how many spares would an aircraft carry?

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: EMBQA
Posted 2006-05-26 01:43:19 and read 16241 times.

Quoting LouA340 (Reply 58):
I was just wondering, on a usual day how many spares would an aircraft carry?

None. In this case the tire was robbed to get the second plane out. I'd guess they made that decission based on schedules. The doner planes was due out later then the receiving plane so by doing the rob, the schedule was less impacted.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: LouA340
Posted 2006-05-26 02:55:01 and read 16202 times.

I know it all pretty much boils down to the aircraft weight, but couldnt they then carry an extra tyre during flights so that in a situation where you need to replace a tyre, it wouldnt impact the schedules that much?
I dont think a couple of tyres will add that much weight to the aircraft.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Kaddyuk
Posted 2006-05-26 06:33:21 and read 16167 times.

Quoting LouA340 (Reply 60):
I know it all pretty much boils down to the aircraft weight, but couldnt they then carry an extra tyre during flights so that in a situation where you need to replace a tyre, it wouldnt impact the schedules that much?

Some airlines do carry spare wheels in the bulk for exactly that reason. If you've got an aircraft flying to an airport which does not have technical support you may wish to take a spare tyre... However on a normal day to day service, both airports should have spares available on the ground.

Obviously in this case, there was no spares, or they only had one available (Blown nose wheel means both wheels are changed).

Also, if on a four wheel bogie, two wheels on the same axle go bang, the two wheels on the opposite axle must also be replaced.

I've changed a wheel on the B747-400 in about 15 to 20 minutes. The A340 has TPIS and the sensor takes some extra time to wirelock etc so you're looking at about 30 minutes on the Airbus.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2006-05-26 10:30:53 and read 16105 times.

Quoting EMBQA (Reply 4):



Quoting LouA340 (Reply 58):
I was just wondering, on a usual day how many spares would an aircraft carry

Out here.None.
Most Airports will have operators than Spares can be procured from.If not then Spares would need to be transported in on another Aircraft.
Considering the Frequency of Uscheduled Wheel change.No point carrying that Extra weight along.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: TristarSteve
Posted 2006-05-26 13:30:40 and read 16080 times.

Quoting HAWK21M (Reply 53):
How is the Brake held on a B777 Axle.I heard just One Antirotational Bolt/Nut.Can anyone confirm.
regds
MEL

Yes same as B757 and B767. The brake slides onto the axle and an anti torsion rod stops it rotating. The wheel holds it in place.
Tristar has same design. I once met a Tristar in BAH where the brake had been changed in CMB before departure. They had left the big bush out in the anti rotation rod, and just fitted the end caps. Made quite a mess as the brake rotated with the wheel.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Kaddyuk
Posted 2006-05-26 14:49:26 and read 16057 times.

If memory serves me correctly, the B747 is held on the same way only being held in place by the Torque Linkage and the wheel itself over the top

I Also think the A340 is exactly the same, however i've never replaced an A340 brake unit.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: A/c train
Posted 2006-05-26 15:00:13 and read 16047 times.

Tristar, did you raise an MOR ? or tuck it under the carpet as a hyd leak or something else ?

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: CO738
Posted 2006-05-27 05:38:27 and read 15901 times.

Well here in the US and Canada we have what is called AAA ( American Automobile Association) and since most aircraft fall into the "heavy category" AAA comes out with a heavy duty tow truck about a 60ton wrecker backs up to the aircraft lifts the side where the flat tire is changes the tire out backs the plane down, leaves the scene and gets paid an amazing 27 dollars for his/hers efforts... yes thats what we get for changing your tire on the side of the road

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: DC-10Tech
Posted 2006-05-29 12:09:31 and read 15621 times.

Quoting UAL Bagsmasher (Reply 20):
I have heard stories of aircraft whose nose gears are canted forward, having their nose tires changed without jacking. You turn the nosegear fully in one direction or the other. The result is that one of the two nose tires actually leaves the ground without the use of a jack. You can see this on a DC-10 in a sharp turn. Only one nose wheel is touching the ground. A tire change in this manner can't really be safe, but I've heard of it being done.

While this is definitely not an approved procedure, it does get done from time to time. When I was a flight mechanic with a couple of DC-10/MD-11 operators, one would occasionally perform this task when in a pinch (ie, tire blown out in the middle of BFE and you are the only guy there with no equipment, etc). To maximize safety in this procedure, we would pull and collar the circuit breakers to the aux hydraulic pumps and tie a strap around the tiller to it could not return to center, and then proceed to change the nose tire in an expeditious fashion.  Wink

Officially, if something went wrong while deviating from established procedures, kiss your license goodbye. Sad

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: ReidYYZ
Posted 2006-05-29 19:49:04 and read 15580 times.

Quoting HAWK21M (Reply 33):
Why did you include the type ie 757.

It appears that the '57 still has the same problem that I used to encounter years ago. It is that the '57 main wheel asseblies are still prone to tie bolts shearing at a regular rate. It is not a '57 problem, per se, it is more of a tiebolt/rim manufacurer problem that is exclusive to the '57. To add a little more detail, the bad bolt in question is actually sheared, head/threaded end and nut missing with the body of the bolt still in the hole. Or for more fun the remainder of the bolt falls in towards the brake and makes a mess of the brake.

Quoting CO738 (Reply 66):
Well here in the US and Canada we have what is called AAA ( American Automobile Association)

True, but sticklers that they are, they prefer to be called CAA (Canadian Automobile Association) and they only get $25.00 Canadian Peso.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: 2H4
Posted 2006-05-29 20:18:22 and read 15610 times.




Quoting MD11Engineer (Reply 21):
21) dejack plane

Man I love aviation terminology...  Smile



Here's another unapproved method:


View Large View Medium
Click here for bigger photo!

Photo © Daniel Danielsen



 Wink




2H4


Topic: RE: How Do You Change A Wheel On An Airliner?
Username: TWAL1011727
Posted 2006-06-07 12:52:32 and read 15256 times.

Quoting HAWK21M (Reply 16):
I think Brake change during Transit is tougher due Temperatures Involved

Gloves help...A brake assembly change takes about 1/2 to 1 hr depending on the equip on hand, maybe more time on widebodies. BTW..Thats after the tire is already off. 99.9% of the time it takes alot longer to get the brake assembly and tools together to do the job than it does the actual change.

KD MLB

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2006-06-07 19:10:01 and read 15215 times.

Quoting TWAL1011727 (Reply 70):
A brake assembly change takes about 1/2 to 1 hr depending on the equip on hand

Depends on the Aircraft Type & Number of Attachment bolts present.
A B752 would be <15 mins,but a B732 would take 40 mins.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: A/c train
Posted 2006-06-07 22:06:13 and read 15195 times.

if you use the method of turning the nose leg to max angle and then changing the nosewheel, you are leaving a lot of weight on one wheel for an extended period? so does this not necessitate changing the other nosewheel?? unapproved procs unknown results! dangerous game, but im well aware of the fact people have/still do it and it hasnt been an issue before, more just making an observation!

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Christeljs
Posted 2006-06-07 22:25:30 and read 15192 times.

I was onboard Aer Lingus once and we were about to push back when the pilot announced that we had to change a tyre and a break-disc. This was done while we were in the aircraft. Took about 40 minutes.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Airgypsy
Posted 2006-06-08 00:53:40 and read 15173 times.

The gate race. Get those tires changed.
The C-5 can jack it own gear. Onboard compressor for inflation and axel mounted valves for deflation.

The mantra of tire change is: Worn to the cord, low on pressure, no pressure, blown, other tire on same axel low/blown, excessive heat from brake that causes tire compound to degrade, flat spot that captain complains about.
Tire removal: deflate, cover and tag paperwork.
Tire installation: tire should have been inflated and checked at least 24 hours prior, clean axel and recoat with lube, brake spacer installed is brake changed, brake splines engaged (if appl), spin and pretorque to seat bearings, loosen and spin with retorque to final. Spin check to prevent embarassment when done and signing log book and the aircraft doest roll.

Airliner tires are often leased so, they get changed early to prevent damage to the tire body carcass. They are retreaded many times and well cared for. You damage it, you bought it. Try 28 ply ratings.
Airgypsy

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2006-06-08 08:52:29 and read 15149 times.

Quoting Christeljs (Reply 73):
I was onboard Aer Lingus once and we were about to push back when the pilot announced that we had to change a tyre and a break-disc.

A Single Disc on the Brake cannot be changed on line.The Entire Brake Assembly would need replacement.The Brake unit would be despatched to the Brake Overhaul shop.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Aogdesk
Posted 2007-11-07 21:03:31 and read 14304 times.

I have an IL-76 parked outside right now, and I was just looking at the MLG. It appears as if changing the inboard mains would be difficult due to the MLG fairing protruding out from the fuselage VERY close to to the inboard wheels. How do you handle this?? Thanks

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: 2H4
Posted 2007-11-07 21:05:07 and read 14328 times.

Quoting Ajet (Thread starter):
(I can't imagine they're using a jack!)

That's precisely what they use!


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Click here for bigger photo!

Photo © Yuxiaobin



2H4

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Fr8mech
Posted 2007-11-08 04:39:19 and read 14198 times.

Quoting 2H4 (Reply 77):
That's precisely what they use!

Certainly not typical for a fuselage jack to be used for a nose wheel change, even if it is both of them. A bottle jack (30-60 ton) is quite sufficient, and more expedient.

2 1/2 year old thread...how Al Gorian of us, we just recycle.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: BAe146QT
Posted 2007-11-08 05:41:59 and read 14185 times.

Quoting Fr8mech:
2 1/2 year old thread...how Al Gorian of us, we just recycle.

I expected to see the name "HAWK21M" where in fact it says "Aogdesk". He is without doubt our champion thread ressurrector.  Wink

Incidentally, (and apropos of mentioning recycling in the same breath as mentioning someone from/in India), I am told that in terms of materials recycling, India beats the rest of the world into a cocked hat. Everything from metal to glass to cardboard. In Mumbai and other large cities, the homeless are employed by private contractors to collect, sort and clean anything recyclable. They are paid for this work, giving them the ability to feed, clothe and shelter themselves.

We in the supposedly-advanced west have a LOT to learn.

Quote:
how do you change a wheel on an airliner?

That's not half as interesting as how they mate.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Aogdesk
Posted 2007-11-08 07:15:47 and read 14142 times.

Quoting BAe146QT (Reply 79):
I expected to see the name "HAWK21M" where in fact it says "Aogdesk". He is without doubt our champion thread ressurrector. Wink

I was terrified that if I started a new thread entitled "IL-76 MLG Wheel R&R" that the A.net gestapo would be knocking at my door in the middle of the night. I've gotten more than my share of nastygrams lately for this and that lately......so I agonized over the options. Of course, now I'm fully expecting a nastygram for posting this message  Smile

And to boot, my question hasn't been answered......woe is me....woe is me.....

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: BAe146QT
Posted 2007-11-08 07:54:13 and read 14117 times.

Quoting Aogdesk:
And to boot, my question hasn't been answered......woe is me....woe is me.....

Wish I could help but I have no idea. Perhaps they jack it up by the body so that the strut goes out to its full extension and therefore clear of the body?

[Edited 2007-11-08 07:56:03]

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: JetMech
Posted 2007-11-09 01:32:51 and read 13992 times.

Quoting Aogdesk (Reply 80):
And to boot, my question hasn't been answered......woe is me....woe is me.....

Here are some photos, it appears however that they have removed all the wheels


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Click here for bigger photo!

Photo © Koen Hartkamp
View Large View Medium
Click here for bigger photo!

Photo © Karl-Heinz Morawietz



Regards, JetMech

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: LMP737
Posted 2007-11-09 08:12:27 and read 13882 times.

One piece of equipment I recomend for a tire change is a tire dolly. I know some guys who like to manhandle main tires, usually the same guys who end up spending their days off at the chiropractor.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: MD11Engineer
Posted 2007-11-09 08:20:53 and read 13886 times.

Quoting LMP737 (Reply 83):
One piece of equipment I recomend for a tire change is a tire dolly. I know some guys who like to manhandle main tires, usually the same guys who end up spending their days off at the chiropractor.

Dependes on the aircraft type. E.g. a 737 nose wheel is about the same size and weight as a normal car wheel, also a 757 main wheel isn't that heavy. On the other hand, I'd definitely like to have a wheel trolley (or at least that forked piece of steel pipe with two cators under it) for changing a MD-11 or 727 main wheel.

Jan

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: BAe146QT
Posted 2007-11-09 10:23:32 and read 13842 times.

Quoting JetMech (Reply 82):
Here are some photos, it appears however that they have removed all the wheels

Well I'll be. If this is normal procedure, it looks like I might have been right for a change.  Smile

Gorgeous looking aircraft, by the way. Utilitarian, but very pleasing aesthetically. Looks like a BAe146's mum.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Wirelock
Posted 2007-11-09 12:47:33 and read 13793 times.

Quoting Aogdesk (Reply 80):

Quoting BAe146QT (Reply 79):
I expected to see the name "HAWK21M" where in fact it says "Aogdesk". He is without doubt our champion thread ressurrector. Wink

I was terrified that if I started a new thread entitled "IL-76 MLG Wheel R&R" that the A.net gestapo would be knocking at my door in the middle of the night. I've gotten more than my share of nastygrams lately for this and that lately......so I agonized over the options. Of course, now I'm fully expecting a nastygram for posting this message

And to boot, my question hasn't been answered......woe is me....woe is me.....


i can only guess , but i'd say they open the the main wheel well doors to give access when the aircraft is on the ground

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: LMP737
Posted 2007-11-09 15:11:31 and read 13764 times.

Quoting MD11Engineer (Reply 84):
Dependes on the aircraft type. E.g. a 737 nose wheel is about the same size and weight as a normal car wheel, also a 757 main wheel isn't that heavy. On the other hand, I'd definitely like to have a wheel trolley (or at least that forked piece of steel pipe with two cators under it) for changing a MD-11 or 727 main wheel.

Naturally nose tires on aircraft like the 737, MD-80, F100 etc you don't need lifting equipment. 757 main's are not that bad, however one has to remember that it does not take that much weight to hurt your back. All it takes is the wrong motion while changing it and the next thing you know your in a lot of pain.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2007-11-10 00:12:40 and read 13657 times.

Quoting BAe146QT (Reply 79):
I expected to see the name "HAWK21M" where in fact it says "Aogdesk". He is without doubt our champion thread ressurrector

And a Poor innocent Guy is being framed  wink 

On the topic By the look I guess the Doors would have access to removal,prior to wheel change.Anyone from Mx on Russian crafts out here.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Surfpunk
Posted 2007-11-16 23:24:00 and read 13323 times.

MD11Engineer, I have a question for you: When doing a NLG tire change on an MD-11, do you have to install the tail stand to prevent tipping? Or on any other aircraft with a penchant for leaning back if loaded improperly (727 also comes to mind)?

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Fr8Mech
Posted 2007-11-17 01:44:12 and read 13312 times.



Quoting Surfpunk (Reply 89):
MD11Engineer, I have a question for you: When doing a NLG tire change on an MD-11, do you have to install the tail stand to prevent tipping? Or on any other aircraft with a penchant for leaning back if loaded improperly (727 also comes to mind)?

No, we do not need to install any kind of tail support. You just need to trust that the folks loading the aircraft are doing their job. And really, if they screw up the load to the point of tipping, your measly 6 inches isn't going to make a difference.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2007-11-17 05:44:06 and read 13277 times.



Quoting Surfpunk (Reply 89):
When doing a NLG tire change on an MD-11, do you have to install the tail stand to prevent tipping

I've not worked on the MD11,but Jacking the NLG or MLG for the same will not cause a severe CG shift.
Hwever it pays to ensure that Equipment/trestles/workstands are clear when Jacking & lowering.

regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Surfpunk
Posted 2007-11-17 22:19:21 and read 13178 times.

Quoting Fr8Mech (Reply 90):
No, we do not need to install any kind of tail support. You just need to trust that the folks loading the aircraft are doing their job. And really, if they screw up the load to the point of tipping, your measly 6 inches isn't going to make a difference.

Thanks for the reply. I was just curious, as we had to load MD-11s, DC-10s, and 727s with an equal fuel amount across the wing and center fuel tanks for proper load balancing (I think it was partly due to the rake of the wings), and the RON 727s would get a ballast load (heavy in the center tank) for towing for overnight parking. I also remember seeing the tail stand in place on 727 on more than one occasion.

[Edited 2007-11-17 22:20:44]

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2007-11-18 04:01:49 and read 13147 times.



Quoting Surfpunk (Reply 92):
as we had to load MD-11s, DC-10s, and 727s with an equal fuel amount across the wing and center fuel tanks for proper load balancing

Does the Fill Wing tanks full before Ctr Tank apply on the type.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Tdscanuck
Posted 2007-11-18 11:23:46 and read 13118 times.



Quoting HAWK21M (Reply 93):

Quoting Surfpunk (Reply 92):
as we had to load MD-11s, DC-10s, and 727s with an equal fuel amount across the wing and center fuel tanks for proper load balancing

Does the Fill Wing tanks full before Ctr Tank apply on the type.

Trijets generally don't have that requirement, since it allows them to run tank-to-engine for much of the flight.

Tom.

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Surfpunk
Posted 2007-11-18 18:31:49 and read 13021 times.



Quoting HAWK21M (Reply 93):
Does the Fill Wing tanks full before Ctr Tank apply on the type.
regds
MEL

No. The trijets would have each of the left wing, center, and right wing tanks filled equally up to the capacity of the wing tanks (which were less than the center), and fuel loads above would put the balance into the center tank. Example: a 30,000 lb fuel load on a 727 would be divided 10,000 lbs Left, 10,000 lbs Center, 10,000 lbs Right. A 40,000 lb load would be 11,500 L/17,000 C/11,500 R (the amount in the wing tanks may vary a few hundred pounds, depending on the SOP of the individual airline...NW put 11,500 lbs in the wings of 727s during non-winter operations).

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: HAWK21M
Posted 2007-11-19 05:49:04 and read 12971 times.



Quoting Surfpunk (Reply 95):

That makes sense.As Structural point of view,the Wing tanks would need to be filled to capacity before the Center tanks can be filled.
regds
MEL

Topic: RE: How Do You Change A Wheel On An Airliner?
Username: Fr8Mech
Posted 2007-11-19 09:01:07 and read 12957 times.



Quoting HAWK21M (Reply 96):
As Structural point of view,the Wing tanks would need to be filled to capacity before the Center tanks can be filled.

No, on a trijet, the wings and center tank are filled at the same level until the wings are filled to capacity. The rest is dumped into the center. (This is assuming a 3 tank configuration).


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