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Changing A DC-9 Tire Takes How Long?  
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Posted (12 years 9 months 1 week 6 days 5 hours ago) and read 2162 times:

Hi guys.

In the photo below of the DC-9, the photographer states that the jet is receiving a very fast wheel change while passengers are loading.

I'm curious. Just how fast does it take to change a main gear tire on a DC-9, and how many mechanics are needed to do the job?


Click for large version
Click here for full size photo!

Photo © Den Pascoe



Chris  Smile


"Just a minute while I re-invent myself"
17 replies: All unread, jump to last
 
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 1, posted (12 years 9 months 1 week 6 days 4 hours ago) and read 2019 times:

Hi TechRep.

Good question. OK, I suspect that Union mechanics might take their time compared to non-union mechanics, thus the tire change could take longer.

Let's say they are Union mechanics and are in a great mood and would love to fix the DC-9's tire as quick as possible so that the pilots can get on their way with all their nervous passengers. How long would it normally take the 2 mechanics seen in the photo?

Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 9 months 1 week 6 days 3 hours ago) and read 2011 times:

Two guys on a main tire 20-30 minutes. 20 minutes if they serviced it with air ahead of time, 30 minutes if they didn't. This doesnt include policing the tools together to do the job of course. If they have a large fleet they may have a team that only changes brakes and tires. These guys are surgical and can definetly do it in the above time frame. If the mechanics are less experienced you may add another 15-20 minutes to the above. DC-9's are easy to do you don't even need a wheel dolly to pick up the tire assy. In fact the nose tires you don't even need a jack, just turn the wheel all the way to one side, bearings on a DC-9 nose tire are held in with clips. bam quick quick... 10 minutes

If these guys are union and havent had a contract in 2 years add another hour, plus there will be no nitrogen in the tanks because someone kept opening it on purpose. Thats why those two guys are wearing white, the have suits on underneath, they are in fact supervisors and managers. Goodluck it just gets too complicated after that.

TechRep


User currently offlineJjbiv From United States of America, joined Jan 2001, 1226 posts, RR: 5
Reply 3, posted (12 years 9 months 1 week 5 days 21 hours ago) and read 1957 times:

How long for a (single) brake change on a main wheel?

I was on an AirTran flight a while back that was delayed for hours due to a "thump" during taxi that was noticed by an FA. The Capt. said that it's usually a bad bearing. So they put it on concrete, jacked her up, and ended up changing the brake assy. and maybe the bearings, too. It took forever, from a pax. perspective. Of course, there was one A&P helped by an untrained ramper. The ironic part is that the a/c had a wheel change (or maybe just tire) during routine RON maint the night before.

joe


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 4, posted (12 years 9 months 1 week 5 days 19 hours ago) and read 1945 times:

"Tech Rep"'s uncalled for, rather opinionated misinformation larded diatribe notwithstanding, A DC9 main wheel assy can be R&R'd by 2 mechanics in 15-20 minutes if the jack and new tire, torque wrench and sockets are close at hand- and then there's the obligatory tagging/paperwork. Some terminals are better than others for setting up of equipment/parts for quick access during "through flights". -- We do not change "tires"...we change the wheel assembly- Wheel, tire, new bearings, the whole enchilada. They come fully serviced at most carriers. -- Brake changes can take just a few minutes and on up. It depends if they are: 1) Bolted to the axle or 2) retained by the main wheel axle nut and anti-rotation peg- pretty fast to R&R. Bolted ones take longer and the whole mess is usually hotter than hell. More time for bleeding where required ( F28, F100 to name a few ).

User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 5, posted (12 years 9 months 1 week 5 days 18 hours ago) and read 1922 times:

Get over yourself I was using some humor. Lighten up!!

User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 6, posted (12 years 9 months 1 week 5 days 18 hours ago) and read 1913 times:

Maybe your one of those union mechanics with no contract that's why you took it so personal.

User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 7, posted (12 years 9 months 1 week 5 days 18 hours ago) and read 1907 times:

BTW NKP S2 tire is a figure of speech. We all know they are wheel assemblies. If you would have looked past the humor a little and pulled that torque wrench out of your A@@ you may have got a chuckle.

Techrep


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 8, posted (12 years 9 months 1 week 5 days 18 hours ago) and read 1914 times:

Nice dodge. Yeah right- Humor, with a chip on the shoulder the size of Texas. Don't tell me to "lighten up". I'm not some union zealot ( ask those that work with me ), but there was no way I'd let those remarks go without a rebuttal- You were insulting, blatantly so. Maybe some may find humor in those remarks, but laymen, especially the younger ones, coming to this forum for hard info will get a distorted picture. I was quite dismayed that "Mr Spaceman" actually appeared to believe that "union or non-union" was actually a factor in a DC9 tire R&R. If you're into hyperbole, then start a new thread on the subject. -- I read your "new to forum" post and thought you'd be a good addition to this BB with your experience ( according to your profile), as there are many A&P's like myself who are "regulars" on this forum here and we're glad to post info and get insight about other carriers, A/C and technology. If you lurked here some time before posting you would've seen that. You've just begun here...and already you're off to a "great" start. -- I do however hope to keep future discussions more cordial. Later.

User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 9, posted (12 years 9 months 1 week 5 days 17 hours ago) and read 1904 times:

You're really outdoing yourself here as I see you've posted two more gems during the time I was composing my rebuttal. Looks like it wasn't really humor to you afterall. It all comes down to a question: Someone asked about a G.D--ed. DC9 tire R&R and we got a lot of irrelevent crap weaved into the answer. -- BTW, Contract or no contract, it doesn't matter...and yes, for the record, I have a contract, I like the people I work for and work with ( always have ) and enjoy what I do- because I still _do_ it.  Smile

User currently offlineL-188 From United States of America, joined Jul 1999, 29805 posts, RR: 58
Reply 10, posted (12 years 9 months 1 week 5 days 14 hours ago) and read 1883 times:

Actually I found Techreps respose great Big thumbs up

Funny and informative Laugh out loud

Besides union or non union there are some who don't think a tire can be change fast enough. There is a ramp legend about a 747 that got a bolt of all things impaled into one of the tires. The contract maintaince staff wanted to change the tire. The F/E got his hands on a set of vice grips and pulled the bolt out of the tire, "It's ok now, We change it in Seoul".

This is just an ramp legend of course so I won't name the airline this guy worked for or the handling company.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 11, posted (12 years 9 months 1 week 5 days 11 hours ago) and read 1877 times:

Exactly right. Big thumbs up


You're only as good as your last departure.
User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 12, posted (12 years 9 months 1 week 5 days 8 hours ago) and read 1864 times:

Next time I will include the Maintenance Manual reference so I don't cloud the issue too much, I think its 32-40-10 for the DC-9, however it's been 5 years since I touched a DC-9. I will no longer use humor since you get offended so easy. Sure I am new but why should I have to walk on egg shells because your offended so easy? It's just some harmless union jabbing. BTW you used the term "DC-9 tire" in your last post, we do not change tires we change Wheel assy's remember? So do you see how far this can actually go? Just get a chuckle and move on, all you did was repeat the information In my original post anyway.

TechRep


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 13, posted (12 years 9 months 1 week 5 days 6 hours ago) and read 1852 times:

I differentiated the "tire" vs "wheel assy" in response to "Jjbiv"'s post. Read his post and you'll see. We always call them "tire changes" too except in the log book entries. No "gotcha!" this time my friend. -- Apparently our esteemed moderator agrees that this is not an issue of being easily offended, "walking on eggshells", and other red herrings etc.- The thread seems to have lost a post Smile -- That being said, I'm more than willing to "move on", always have been- That's what I've been doing on this forum for near 2 years. Later.

User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 14, posted (12 years 9 months 1 week 5 days 6 hours ago) and read 1844 times:

Honestly I was only having some fun, sorry it was taken the wrong way. I appologize, now lets have as beer or two.

TechRep


User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 15, posted (12 years 9 months 1 week 5 days 3 hours ago) and read 1837 times:

Hi guys. Thanks for your replies.

Wow, this post sure took an interesting twist. But hey, it's good to have a post "beefed up" now & then.

OK, TechRep & NKP S2, you both mentioned 20 minutes as part of the range in time required to change a DC-9's wheel/tire assembly. That seems pretty fast. I understand that if the mechanics are ready & organized before the DC-9 rolls up, the R&R time will be quicker, and the passengers will be happier.

It was also interesting to learn that a jack isn't needed to change a DC-9's nosewheel. It sounds like the nosegear's turning limit is around 90 degrees left & right.

>>> NKP S2, have no fear. There's no reason to feel dismay over me appearing to have believed Union or Non-Union mechanics would be a factor & make a difference in time required. I knew TechRep was just joking around, so I had some fun of my own with my response to his short question about whether the mechanics were Union or Non-Union? (which for some strange reason was deleted!). Other members must be wondering why I replied to my own post, mentioning Unions & mechanics in good moods. Don't worry guys I'm not suffering from Part-Timers!

I thought the comment about the mechanics wearing suits under their overalls was pretty funny. I've had to deal with Union hassels before when working on a ramp at Toronto Intl. (YYZ) which resulted in unemployment for myself & many others.

Take Care guys & thanks for the info.

Chris  Smile





"Just a minute while I re-invent myself"
User currently offlineCharliecossie From Germany, joined Oct 2001, 479 posts, RR: 9
Reply 16, posted (12 years 9 months 1 week 5 days 1 hour ago) and read 1837 times:

L-188:
A/C run over bolts all the time. It's quite normal to pull the bolt out and *then* decide if the wheel needs changing. After all, the carcass of a 747 tyre is pretty thick.


User currently offlineTimT From United States of America, joined Jun 2001, 168 posts, RR: 0
Reply 17, posted (12 years 9 months 1 week 3 days 16 hours ago) and read 1801 times:

I tend to agree with NKP S2's thoughts. I'm a UNION member, and Proud of it. The 20 minute tire change (or tire and wheel assemby, if you prefer) is a fact of life. No problem. The biggest time killer is having to hunt the correct tools. And then find a jack that works.

The DC-9 nose wheel turns 82 or 87 degrees. (I forget which) Put a bypass pin in it, install the towbar and crank it around. Or be lazy- run the hydraulics and crank the tiller.


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