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originally posted by: thebozeian
a reply to: Zaphod58
You mean the Qatar one I assume? I didn't personally but I was there on the day. They took our hangar (reputedly after the Qatar CEO rang up mine and gave him a dressing down about not helping out and demanded our shed) as they needed to jack the aircraft for a gear swing and T/S. I should have taken pics actually but was busy. They flew it up from MEL at 10-12,000ft with the gear locked down as the they couldn't get a retraction. Turns out my old boss worked out that it was being inhibited by a sequencing problem, which was itself being caused by a massive internal actuator leak on the RH WLG bogie tilt actuator. You could hear it clearly and the effect it was having on the hydraulic pumps. Replacement is pretty simple, much like a 747, and you need to bleed at the actuator before bleeding the whole system which is like any aircraft. Its always fun watching a gear swing on a 380 as something that massive ends up so high on jacks. The rule of thumb I use is that you want around 500mm of clearance between the floor and the bottom of the fwd pair of wheels on the wing gear as they hang lowest (think from memory the manual says at least 375mm). The sound is probably the most impressive when you get it high on the jacks, the whole hangar floor begins to softly rumble with a deep base sound and the body gears boom as the oleo lengthens.