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747-400 Independent Gear Retract/extend  
User currently offlineNjxc500 From United States of America, joined Dec 2007, 251 posts, RR: 0
Posted (6 years 3 months 3 weeks 6 days 8 hours ago) and read 4118 times:

I have run into a video which shows the gear retracting separately from the other 3.


Why and how does this happen?


2 replies: All unread, jump to last
User currently onlineCCA From Australia, joined Oct 2002, 928 posts, RR: 14
Reply 1, posted (6 years 3 months 3 weeks 6 days 7 hours ago) and read 4110 times:

They have left the gear pins in to stop the left body gear and nose gear retracting, you can just barely see the left body gear door still opens and closes during the cycling of the gear lever.

The wing gear (sys #4) definitely wasn't pressurised however the pins would still have been in for safety sake as any residual pressure may have allowed the gear and doors to move, and seeing that the wing gear doors didn't open means there wasn't any pressure applied to them.

User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 2, posted (6 years 3 months 3 weeks 5 days 23 hours ago) and read 3999 times:

Retraction checks with Landing gear downlock pins will def cause a weakening of the pins over time.

Is there any life of these pins that they need to be replaced after fixed intervals or a check to confirm its material strength is satisfactory for the intended purpose.


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