# Have landing gear collapsed at the gate?

I do not include after emergency landings, but just while "sitting at the gate."

• I rather doubt it, it's more likely that it will tip over by badly balanced boarding/loading Aug 23 '14 at 20:08
• There have been quite a few incidents. Here's one, nycaviation.com/2013/08/…, Google will find others. Aug 23 '14 at 20:40
• I witnessed a Fokker 50 retracting its gear while parked at the gate. The aircraft made only one flight after that; a ferry flight to the scrapyard. It wasn't loading passengers at the time though. Aug 25 '14 at 15:45
• @Simon Could you please turn your comment into an answer? I cannot accept any of the existing as answers to my question, while your comment is one. Aug 27 '14 at 14:17

There have been quite a few incidents. Here's one,

http://www.nycaviation.com/2013/08/pictures-nose-gear-of-united-boeing-767-300-collapsed-at-gate-at-iah/

I can't find links, but do know that there have been incidents caused by different issues such as ground locks not in place, failed struts, WoW logic failures and so on where when hydraulic power was applied, the gear retracted or collapsed.

• A World of Warcraft logic failure??? (Newbie: What a WoW logic failure?) Aug 26 '15 at 12:42
• @RoboKaren Sorry, just seen this! WoW, weight on wheels. A set of logic which tells the aircraft that it is done flying and firmly on the ground, or alternatively, started flying and no longer firmly on the ground. Oct 13 '15 at 11:09

A good landing gear design locks it into the extended position under the aircraft's weight. This makes it physically impossible to retract it at the gate, but when the switch is in the wrong position the gear starts to retract during liftoff, when the wings take over the duty of carrying the weight.

This doesn't mean that careless operation or maintenance procedures can't make it retract, however. When the aircraft is poorly balanced, say during loading and unloading, the weight on the nose gear might not suffice to lock it, so a wrong switch position can cause an unintended retraction.

• This makes it physically impossible to retract it at the gate - should be This makes it theoretically impossible to retract it at the gate. There are several instances where it has indeed happened - I linked to one in my comment above. There are at least 2 others. Aug 24 '14 at 10:30