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Wheel Door Open  
User currently offlineSalim From Lebanon, joined Jun 2001, 303 posts, RR: 1
Posted (12 years 5 months 1 week 1 day 3 hours ago) and read 1305 times:


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Why are the wheel doors open on this pic? is it normal?
thanks
salim

13 replies: All unread, jump to last
 
User currently offlineHkgspotter1 From Hong Kong, joined Nov 2005, 0 posts, RR: 0
Reply 1, posted (12 years 5 months 1 week 1 day 3 hours ago) and read 1252 times:

I guess they are checking something. Its not `normal' for the gear doors to be open.

User currently offlineNdebele From Germany, joined Apr 2001, 2901 posts, RR: 23
Reply 2, posted (12 years 5 months 1 week 1 day 2 hours ago) and read 1214 times:

Doesn't that have something to do with the hydraulics? Have a look at that picture:

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Photo © Philipp Wiedenmann


The gear doors are opened, too, and if memory serves right, that LTU 757 pictured above had a loss of hydraulic and thus the gear doors remained open. Probably that TMA A310 pictured above has the hydraulics checked?
But I'm not an expert, maybe you should better ask that question on the tech/ops forum.


User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3701 posts, RR: 34
Reply 3, posted (12 years 5 months 1 week 1 day 1 hour ago) and read 1188 times:
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Gear doors are often opened to carry out maintenace in the wheel well. Additionally if for some reason the gear is free-falled the doors will not close again until the system is reset by maintenance

User currently offlineBlatantEcho From United States of America, joined Sep 2000, 1913 posts, RR: 1
Reply 4, posted (12 years 5 months 1 week 23 hours ago) and read 1151 times:

In the LTU 757 picture where the main doors are hanging down, it doesn't look like there is much clearence from the ground.

Does anyone know if a heavier plane, or a hard landing would compress the gear enough that they strick the ground?

I am sure their are procedures for landings as such, but I'm curious to know the particulars.

Regards,
BlatantEcho



They're not handing trophies out today
User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 5, posted (12 years 5 months 1 week 23 hours ago) and read 1135 times:

The gear doors cycle back to close when the gear are extended or retracted, so they will not be a factor on landings. On the ground a bypass handle is pulled allowing the gear doors to be opened. Typically, hydraulics is re-applied and the bypass handle is then closed and the doors will slam back shut. On the larger aircraft B747 and DC-10 if your brave enough, you can ride the gear doors up in lieu of no ladder being present. I never felt comfortable doing it but I have.

TechRep


User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 6, posted (12 years 5 months 1 week 23 hours ago) and read 1127 times:

I forgot to mention in some emergency situations from loss of hydraulic fluid, depending on aircraft, the gear would be allowed to be extended but the main gear doors to conserve fluid resources will not retract back to faired position. So in that case a hard touch down could impact the main gear doors. If an airplane is seen with the gear doors down on approach or while taxiing, then there is some cause for concern.

TechRep


User currently offlineBlatantEcho From United States of America, joined Sep 2000, 1913 posts, RR: 1
Reply 7, posted (12 years 5 months 1 week 22 hours ago) and read 1113 times:

Your second reply was what I was getting at, in the event that their is not even pressure to close the doors on landing.....

So they could hit in a situation like that, interesting. Sorry this inerests me so much, do you know if they would chance to break off, just crumple, or what?

I know it would be different for different craft, but have you even seen scrape marks on gear doors when a landing was made with them down?

I'm going to shut up now, but thanks for your replies,
BlatantEcho



They're not handing trophies out today
User currently offlineSalim From Lebanon, joined Jun 2001, 303 posts, RR: 1
Reply 8, posted (12 years 5 months 1 week 20 hours ago) and read 1087 times:

Thanks guy for your answers!!!

User currently offlineKlaus From Germany, joined Jul 2001, 21479 posts, RR: 54
Reply 9, posted (12 years 5 months 1 week 15 hours ago) and read 1053 times:

Wouldn´t it be a serious design error to have the gear doors big enough to impact the runway on a firm touchdown? After all, ripped-off gear doors might cause additional damage to the aircraft in an already difficult situation...

User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 10, posted (12 years 5 months 1 week 15 hours ago) and read 1044 times:

Well bringing the doors back up is not essential and in emergency situations only essential users get power/hydraulics.

Example: When hydraulic reserves are at a critical level, around 1.5 to 2.0 gallons in a 40 ton aircraft, ripping the gear doors off or causing damage to them is of little concern.

TechRep


User currently offlineKlaus From Germany, joined Jul 2001, 21479 posts, RR: 54
Reply 11, posted (12 years 5 months 1 week 15 hours ago) and read 1028 times:

When hydraulic lines get damaged in the process (when the doors go, so might the actuators), secondary damage could be possible. Possibly affecting the brake lines. Or leaking hyd fluid being spilled on the hot brakes (possible fire hazard).

I just don´t think an airframe designer could afford to take risks like that. My guess is the doors wouldn´t touch the runway as long as the landing gear doesn´t break. (That would have to include surviving complete tyre blowouts without impact.)

Does somebody have any actual evidence one or the other way? I´m just guessing here...


User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 12, posted (12 years 5 months 1 week 14 hours ago) and read 1011 times:

The one aircraft family I'm aware that the gear doors contact ground when opened are the DC9/MD80.

On the bottom of the doors are skid bumpers. These are designed to take the brunt of a doors open landing.


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You're only as good as your last departure.
User currently offlineTechRep From , joined Dec 1969, posts, RR:
Reply 13, posted (12 years 5 months 1 week 13 hours ago) and read 996 times:

Klaus,

If the doors are impacting the ground that hard hydraulic power is of little concern at that point. The design causes the doors to naturally go to the closed position when they impact the ground, if in fact they even can. They will drag maybe but they will tend to bounce up not shear off. The DC9 family, was what I had in mind, they have a brass/bronze stop to cushion impact when they are opened on the ground.

TechRep


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