scooter2525
Very well Member
I did a search through six pages and couldn't find anything. Why do the front of the trucks sit lower then the rear on the mains?
B767 Landing Gear
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SFCC/UND
Well-Known Member
scooter2525
Very well Member
sighhhhh :bandit:
Polar742
All the responsibility none of the authority
Does the 767 mechanically tilt the gear when it's in the air?
I've heard that it does but I haven't necessrily seen that in a manual or in actual practice. Just being honest!
ScoutFlyer
Well-Known Member
I don't know how reliable this is, but I heard somewhere that it had to do with fitting the gear into the gear bays when retracted. Apparently it wouldn't fit if hinged "normally" like on the 757. That's what I heard somewhere, may or may not be true.:dunno:
Polar742
All the responsibility none of the authority
Good enough for me!!
Ours does, and they tell us all about it when we were in the classic.
The 400 is more: "It tilts to fit the gear in the wells. When you land, the gear comes off tilt and the jet knows it's on the ground".
Minuteman
I HAVE STRONG OPINIONS ABOUT AUTOMOTIVE LIGHTING!
Well, aren't we jaded.
My understanding is that, on the 767, the "diabolos" (what Airbus calls the eight-main configuration on the A320) tilt forward to fit into the gear bay (as was said).
For trivia, 777 trucks tilt backwards when down and locked, but they tilt forward during extension and retraction, also to fit in the bay.
In addition to tilt switches, the 777 used strain gauges on the MLG struts to sense AIR/GROUND (rather than a squat switch). The 787 is supposed to take the strain-sensing one step further and be able to weigh itself and determine the actual CG for takeoff.
scooter2525
Very well Member
I should have been more specific in my OP. I was referring to when the 767's gears were down and locked.
Maximilian_Jenius
Super User
Fair enough for me!
I hear the 767 lands forward main trucks first and the 757 aft main trucks first. But I'm seriously either too indifferent or two highly-critical to watch.
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PeanuckleCRJ
Poodle Wrangler
I too have heard the odd positioning it is for to fit into the gear bay.
It's a bit of an odd landing airplane... the 757 always seems to land much smoother.
It's a bit of an odd landing airplane... the 757 always seems to land much smoother.
SFCC/UND
Well-Known Member
Polar742
All the responsibility none of the authority
Ahem...a certain 1980's designed jet that has a hump on it's back already weighs and computes CG. It relies, as far as I know, on strut pressures in the mains and nose.
There is also a squat-switch on the nose that verifies the proper loading/takeoff trim elevator ranges.
So, yeah, I think I said it before, but I've been drinking a lot of coffee this AM and am all tippy-typee. The tilt on the whale sticks the gear in the wells. They use an angle sensor on the mains to determine air/ground status. Hard for that to ice up for false indications.
Firebird2XC
Well-Known Member
An old 75/76 IP once told me that the 75's gear tilts forward like it does so it fits into the gear wells during retraction.
I would assume the logic applies to the 76- if only that the if the 76 doesn't need it, they tilt back because that's optimal in the flare, i.e. the entire surface area of the gear contacts more evenly.
The latter on the 76- is just my best guess, but the 75- is good data.
I would assume the logic applies to the 76- if only that the if the 76 doesn't need it, they tilt back because that's optimal in the flare, i.e. the entire surface area of the gear contacts more evenly.
The latter on the 76- is just my best guess, but the 75- is good data.