Ever seen a 747 bounce? VS 43 at LGW Gear Issue

They circled for quite a bit, the article says they may have dumped fuel too.
 
I was wondering if the hard landing was intentional. Maybe one of the 747 guys (@Polar742) could comment on the ground shift sensing system and if there would be some concern that it might not work correctly if the right main gear wasn't involved.

Also, the captain was a bad ass and wished the tower (or maybe the crash trucks) a happy new year after things calmed down a bit.
 
I doubt the bounce was intentional - probably wanted to land firm with the #4 system out (spoilers), and a significant number of breaks hanging half way out the wheel well. I hear bouncing, is pretty easy when you combine firm landings with being overweight.

Rumor has it the plane was in the hanger yesterday trying to fix this problem.
 
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Murdoughnut said:
You think the bounce to try and knock the gear down?
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BobDDuck said:
I was wondering if the hard landing was intentional. Maybe one of the 747 guys (@Polar742) could comment on the ground shift sensing system and if there would be some concern that it might not work correctly if the right main gear wasn't involved.

Also, the captain was a bad ass and wished the tower (or maybe the crash trucks) a happy new year after things calmed down a bit.
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I_Money said:
I doubt the bounce was intentional - probably wanted to land firm with the #4 system out (spoilers), and a significant number of breaks hanging half way out the wheel well. I hear bouncing, is pretty easy when you combine that with being overweight.

Rumor has it the plane was in the hanger yesterday trying to fix this problem.
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I doubt the bounce was intentional, looked like a high rate of descent.

The assumption that Hydraulic 4 is out, may or may not be true. System 4 does power the wing gear, but only for retraction. Once the unlocks are released, the gear free falls. Looking at some under side shots from another article, it looks like one of the door actuators may have broken wedging all that crap together, preventing the gear from dropping. If system 4 did fail SOME, but not all spoilers fail. However, the failed spoilers in the loss of system 4 cause a pitch up when spoilers deploy. Also, there would be a loss of autobrakes which would exacerbate the nose up tendency after landing. However, from the video it's not evident that there was any hydraulic issue.

@BobDDuck I don't know how you bounce one. Skip, yes. Bounce, no.
 
Polar742 - Passengers interviewed mentioned the pilot saying they returned because there was a hydraulic issue, from what is being reported they were at FL320 when they decided to return. A guy on Pprune was talking about this not being the first hydraulic 4 system to fail in this manner and from what he saw it looked like that was the culprit. You certainly know far more about it than I do, I am just giving you where I got my tip bits from.
 
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Polar742 said:
@BobDDuck I don't know how you bounce one. Skip, yes. Bounce, no.
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I didn't say anything about a bounce. That was somebody else. My comment was more about the system logic to tell the airplane that it is on the ground. I've flown airplanes that require strut compression and wheel spin up (plus RA and a bunch of other stuff) in order to unlock the reversers and deploy the spoiler panels. With a strut out of the equation I can see making a firm landing to get wheel spin and compression on the other strut to make sure.
 
BobDDuck said:
I didn't say anything about a bounce. That was somebody else. My comment was more about the system logic to tell the airplane that it is on the ground. I've flown airplanes that require strut compression and wheel spin up (plus RA and a bunch of other stuff) in order to unlock the reversers and deploy the spoiler panels. With a strut out of the equation I can see making a firm landing to get wheel spin and compression on the other strut to make sure.
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Sorry. It goes off the tilt of the gear. If 3 agree, it's all good.

I've landed in the box with the odd gear up. No big deal, at least in the nearjet.
 
I_Money said:
Polar742 - Passengers interviewed mentioned the pilot saying they returned because there was a hydraulic issue, from what is being reported they were at FL320 when they decided to return. A guy on Pprune was talking about this not being the first hydraulic 4 system to fail in this manner and from what he saw it looked like that was the culprit. You certainly know far more about it than I do, I am just giving you where I got my tip bits from.
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So you're speculating on speculation.

Anyway, if that jet has RR or Pratts, see if the #4 transcowl opens. That'll answer your question. I just found it odd the other wing gear had no issue, which is off the same system.

Now, back to dumping all this stuff out of my brain.
 
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