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"DO NOT Tow" On A330 Nose Wheel Gear.  
User currently offlineSalim From Lebanon, joined Jun 2001, 303 posts, RR: 1
Posted (10 years 11 months 3 weeks 3 days 22 hours ago) and read 8732 times:

Why?? I noticed this on mea a330.

19 replies: All unread, jump to last
 
User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 1, posted (10 years 11 months 3 weeks 3 days 22 hours ago) and read 8692 times:

I think you are refering to this NO TOW warning on the nose gear door.


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Photo © CPH Aviation



This red warning area alerts the tug driver the maximum permissable towbar angle during pushout.



You're only as good as your last departure.
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 2, posted (10 years 11 months 3 weeks 3 days 22 hours ago) and read 8693 times:

Hello Salim.

I'm curious about your question too.

I'm also wondering ........ was this a permanent decal/marking, or was it a temporary notice?

I'm looking forward to what the possible reasons could be from the mechanics in here.


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Photo © Dennis Lau



Chris  Smile




"Just a minute while I re-invent myself"
User currently offlineSalim From Lebanon, joined Jun 2001, 303 posts, RR: 1
Reply 3, posted (10 years 11 months 3 weeks 3 days 22 hours ago) and read 8681 times:

I'm sorry, i wanted to say on the nose wheel door. Thats exactly what FDXmech told us.
thank you!


User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 4, posted (10 years 11 months 3 weeks 3 days 22 hours ago) and read 8665 times:

Salim

I tried finding a close-up of an MEA A330 nose gear to no avail. MEA's A330 paint scheme is beautiful, I must say.



You're only as good as your last departure.
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 5, posted (10 years 11 months 3 weeks 3 days 22 hours ago) and read 8651 times:

Hi guys.

> FDXmech, if you enlarge the photo I posted of a MEA A330, you can see the exact same red warning area on the nosegear door.

Thanks for clearing up that the warning sign says NO TOW instead of DO NOT TOW!


Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineCodeshare From Poland, joined Sep 2002, 1854 posts, RR: 1
Reply 6, posted (10 years 11 months 3 weeks 3 days 18 hours ago) and read 8509 times:

It could mean do not to forward? When the a/c is full of passengers?

There are some angles at which the front gear cannot turn, I believe.
I once saw a situation where the tow bar almost broke when the a/c was being pushed back in the wrong manner.



How much A is there is Airliners Net ? 0 or nothing ?
User currently offlineRayChuang From United States of America, joined Jun 2000, 8039 posts, RR: 5
Reply 7, posted (10 years 11 months 3 weeks 3 days 9 hours ago) and read 8373 times:

Here's a question though: what about these newer-generation airplane tugs that literally lift the nose wheel when the plane is being moved around by the tug?  Confused

User currently offlineShenzhen From United States of America, joined Jun 2003, 1712 posts, RR: 2
Reply 8, posted (10 years 11 months 3 weeks 3 days 7 hours ago) and read 8335 times:

On most airplanes, you need to disconnect the scissor link that is attached to both the inner cylinder and the outer cylinder (aft side of the gear). When the link is disconnected, the inner cylinder can be turned a lot futher then the markings on the door.

If the newer generation tugs attach to the inner cylinder of the gear, the restrictions would still apply, since it will damage to the nose gear/steering system. Notice the steering actuators on the fwd portion of the gear attach to the inner cylinder via the scissor link.

Cheers.


User currently offline747Teach From United States of America, joined Nov 2000, 176 posts, RR: 1
Reply 9, posted (10 years 11 months 3 weeks 3 days 4 hours ago) and read 8301 times:

Salim: The maximum turning limit when towing the A330 from the nose gear is 65 degrees. The placard on the nose gear door is there to warn the tractor driver he has reached that limit. The limit is 65 degrees whether you use a towbar, or towbarless tractor, or whether you tow from in front of or behind the nose gear. You do not need to disconnect the scissor link to tow. You do need to pressurize the blue hydraulic system, de-energize the steering system, and follow all other maintenance and safety procedures. This is from the A330 AMM, Chapter 09-00-00 and 09-10-00. Regards,

User currently offlineShenzhen From United States of America, joined Jun 2003, 1712 posts, RR: 2
Reply 10, posted (10 years 11 months 3 weeks 3 days 3 hours ago) and read 8284 times:

747Teach

Maybe I wasn't clear enough. If you disconnect the scissor link, you can turn the nose gear beyond the markings on the gear door (on most every airplane I've seen). If you don't, and the shear bolt in the tow bar doesn't shear, then you have damaged the links and or possibly the steering collar and such.

Cheers


User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 11, posted (10 years 11 months 3 weeks 3 days ago) and read 8244 times:

Right. Generally speaking, these markings apply when the scissors remain connected and the steering bypass valve is positioned to "bypass" or hydraulic pumps remain off.

These steering limits are usually more than sufficient with the tug/towbar/aircraft potentially nearing a "jackknifed" condition as the max angle is reached. Very undesireable with engines running.

Some aircraft, the removal of the apex pin (to split the scissors) is impractical as it is bolted and cotterpinned.

On some aircraft the scissors, though easily split are difficult to rejoin due to tight tolerances and difficulty in moving the links.




You're only as good as your last departure.
User currently offline747Teach From United States of America, joined Nov 2000, 176 posts, RR: 1
Reply 12, posted (10 years 11 months 3 weeks 2 days 23 hours ago) and read 8219 times:

Shenzhen: The A330 AMM outlines towing in the following tasks: 09-10-00-584-802, REF 203/TAsk 09-10-00-991-002 Sheet 1, and REF 204/Task 09-10-00-991-011 Sheet 1. Step 1 says the maximum turning angle is 65 degrees either side of the aircraft centerline. There is no reference given for disconnecting the scissor link. The "NO TOW" placard means "NO TOW," for whatever reason, scissors disconnected or not. I understand what you're saying about disconnecting the scissor link. I disagree that you would do this "on most airplanes." But the original question was about the A330, not generally or "about every plane I've seen." You may be interested in knowing that at 93 degrees, the Nose Landing Gear Steering Angle Protection System, AMM Chapter 32-53-00, will come into play, and activate two fault lights warning the tow crew and the flight deck that the maximum turning angle has been exceeded. Regards,

User currently offlineShenzhen From United States of America, joined Jun 2003, 1712 posts, RR: 2
Reply 13, posted (10 years 11 months 3 weeks 2 days 12 hours ago) and read 8123 times:

747Teach

I'm certainly not going to argue with a guy over specifics, when I replied off the top of my head, and you looked it up in the books.

You may be interested to know that, if the scissor links are disconnected, you can't steer the airplane. thus you probably wouldn't get any warning what so ever.

Look it up and let me know.

Cheers


User currently offlineCdfMxTech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 14, posted (10 years 11 months 3 weeks 2 days 10 hours ago) and read 8110 times:

You may be interested to know that, if the scissor links are disconnected, you can't steer the airplane. thus you probably wouldn't get any warning what so ever.

The Nose Landing Gear (NLG) Steering Angle Protection System gives a visual warning of excess angular travel of the NLG steering during towing operations.
The warning is not for normal steering operations, although it would be pretty hard to get to 93 degrees anyway when the tillers are limited to 78, and to get to that takes an override.

(P.S. - I've never worked Airbus, but I did stay at a Holiday-Inn Express last night Big grin)


User currently offline747Teach From United States of America, joined Nov 2000, 176 posts, RR: 1
Reply 15, posted (10 years 11 months 3 weeks 2 days 3 hours ago) and read 8086 times:

Shenzhen: I am aware that if the scissors are disconnected, you can't steer the airplane. However, you will get a warning. The BSCU will see an angular difference between the LVDT on the servo valve, the RVDT on the gearbox on the turning tube, and the handwheel. This will cause BSCU to generate the N/W STRG FAULT on the E/WD, and the SD will show N.W. STRG in amber on the WHEEL page. A330 AMM 32-51-00 PB001. And for CdfMxTech: The A330 steering system handwheels have 75 degrees of travel either way, giving you 72 degrees of steering motion, which is always available below 10 knots. Same reference. Regards,

User currently offlineCdfMxTech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 16, posted (10 years 11 months 3 weeks 2 days ago) and read 8039 times:

747Teach

I guess I'll have to take your word for it. I don't know how current that material is. Says that 65 degrees is available normally, but 78 can be achieved by overriding a sort of detent or frangible fitting.
This is all dependent upon speed, meaning less is available the faster the aircraft is moving.


User currently offline747Teach From United States of America, joined Nov 2000, 176 posts, RR: 1
Reply 17, posted (10 years 11 months 3 weeks 1 day 21 hours ago) and read 8005 times:

CdfMxTech: Effectivity ALL, Revision October 28, 2003. Regards,

User currently offlineBuckfifty From Canada, joined Oct 2001, 1316 posts, RR: 19
Reply 18, posted (10 years 11 months 3 weeks 1 day 6 hours ago) and read 7924 times:

The nosewheel steering on the Airbus is software limited, I believe, at the BSCU. The steering used to be limited to 65 degrees left or right of centre because of some fault with the torque link (I think) on the 330 and 340, but has since been upgraded to 72.

User currently offlineJoule From Malaysia, joined Dec 2003, 159 posts, RR: 3
Reply 19, posted (10 years 11 months 1 week 5 days 2 hours ago) and read 7708 times:

Yes the nosewheel steering is software limited from the BSCU. Some aircraft still have 65 deg and others 72 deg, depending on BSCU standard and also depending on the landing gear standard (if I'm not mistaken). Originally all A330/A340s had 78 deg but after the Sabena A340 had its MLG fractured on landing some years back (due to fatigue or stress of some sort on the MLG), Airbus changed the steering limits so as not to stress the LGs.

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