sr71
Posts: 28
Joined: Mon Apr 02, 2001 11:47 am

Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 7:02 am

What are your thoughts on aircraft loading while mtce. is doing a tire change or brake assy. change while the aircraft is on the jack??
 
Guest

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 7:39 am

Dear Sr71 -
xxx
That can be done, I had the situation a few times...
Last minute change of a tire with the fuel loaded, and passengers aboard.
I rather have the passengers waiting in the boarding area, but sometimes we are late making the decision.
xxx
Happy contrails  Smile
(s) Skipper
 
avt007
Posts: 1989
Joined: Mon Jul 10, 2000 4:51 am

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 7:43 am

I`ve changed quite a few after everyone is on board.As for doing it while they are boarding, it wouldn`t be my first choice, but no big deal. The aircraft moves around slightly, but not enough to worry about, especially since in the worst case scenario, you still have the other tire(s) on the gear leg to support the aircraft.
 
EMBQA
Posts: 7798
Joined: Sat Oct 25, 2003 3:52 am

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 7:50 am

Well, on Regional aircraft you also need to remember that the 'jack' is just a bottle jack and only lifts up one tire, so it safe to be around and on-board the aircraft.

I've had to do it a few times while working Line Maintenance in BOS. If I would have asked them to de-board the aircraft I would then open up several problems.........
1).. You can change a tire in just a few minutes, so its a much less hassle to leave them onboard.
2)..The passengers would get pissed off if you ask them to get off.
3).. It would add a TON of time to the situation as, once back in the gate area they would need to be RE-boarded and all the hassles that go along with that.
4).. If they do go back inside, I'll bet you 100% Operation will MX-CX the flight.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
sr71
Posts: 28
Joined: Mon Apr 02, 2001 11:47 am

RE: Loading Aircraft During Tire Change?

Sat Mar 13, 2004 9:17 am

Skipper,

My concern was with loading say 7000 lbs. on a pallet into the cargo hold and perhaps causing the aircraft to move. I've seen heavy pallets loaded in the front of a B-767 cause the aircraft to yaw to the left and back to centre again.
Thanks for your input, this topic came up last night while on shift as to the safety aspect and the potential for something to happen.
 
Guest

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 9:32 am

I agree with you, on a 747F loading pallets, I would stop loading.
Or wait until they are finished loading. Good point.
xxx
Happy contrails  Smile
(s) Skipper
 
vikkyvik
Posts: 11860
Joined: Thu Jul 31, 2003 1:58 pm

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 10:05 am

Can someone give a brief rundown of how tires are changed normally on aircraft? (I assume the procedure does not change with the extra weight of passengers and fuel) Interesting that this topic came up today, as my father, who flew into LA yesterday, was telling me earlier how his flight from Phoenix to Ontario was delayed due to needing a tire change. He said it took about 45 minutes, and that he couldn't feel a thing while sitting in the plane.

I was thinking about it, and if you have a two-wheel bogey, for example, and one of the two wheels is suddenly not load-bearing (due to it being changed), then would this not induce some serious stresses in the gear strut and assembly? Or do they have an "alternate" as such for the wheel, to avoid these stresses? Thanks for any replies...
~Vik
I'm watching Jeopardy. The category is worst Madonna songs. "This one from 1987 is terrible".
 
CX Flyboy
Posts: 6040
Joined: Sun Dec 26, 1999 6:10 pm

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 10:44 am

Funny this topic should crop up, as we incurred a 3 hour delay yesterday in Singapore when a tyre deflated during taxi out. They changed the tyre with everybody on board, but it took an hour to find the second jack needed to change the middle pair of wheels in the 777 bogey.

A few weeks ago the engineers managed a wheel change within the turnaround time at Saigon, with passengers and cargo being offloaded then loaded with no problems.
 
Mr.BA
Posts: 3310
Joined: Sun Sep 24, 2000 12:26 pm

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 12:45 pm

Cx flyboy,

It seems that it always take forever for Singapore engineers to find something that is needed. Like my UA flight... they took a good 2.5 hours to find a spare part, where SIA has 38 B744s using the same varient of PW4056s as UABig grin

Cheers.

[Edited 2004-03-13 04:48:19]
Boeing747 万岁!
 
air2gxs
Posts: 1443
Joined: Mon Jun 18, 2001 1:29 pm

RE: Loading While Aircraft During Tire Change?

Sat Mar 13, 2004 11:36 pm

We change tires/brakes all the time on our aircraft during load and unload. Our only real concern is the nose gear. We may hold the load on a nose tire change because the aircraft nose has a tendency to jump around a little while loading/unloading.

Vikkyvik:

Tire changes (or more correctly: wheel assembly changes) are pretty straight forward.
1. Jack the axle
2. Deflate the tire
3. Remove the "hub cap". This is actually known as a transducer drive for the antiskid system.
4. Remove the safety bolt(s)
5. Remove the wheel nut
6. Remove the wheel assy. or the bearing and then the wheel assy.
7. Clean and inspect the axle.
8. Reverse procedure to install.
9. Torque wheel nut as specified.
10. Check pressure before and after lowering wheel.

Should take between 20 & 40 mins for a main.
 
musang
Posts: 788
Joined: Sun Apr 08, 2001 4:11 am

RE: Loading While Aircraft During Tire Change?

Mon Mar 15, 2004 7:15 am

Vikkyvik.

The jack goes under the centre of the axle, so both wheels lifted clear, so no asymmetric stress.

Regards - Musang
 
dairbus
Posts: 518
Joined: Mon Nov 17, 2003 10:45 am

RE: Loading While Aircraft During Tire Change?

Mon Mar 15, 2004 10:50 am

In my experience, mechanics will change tires on large jets while loading and unloading is going on. With RJ's, the mechanics don't mind loading bags but they ask us to hold off on passengers until the aircraft is off the jack. I am not sure why. It might be that they use different types of jacks.
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