737 ng speedbrake
Joined: Jul 2008
Posts: 1,146
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From: Skating away on the thin ice of a new day.
you can (in all 737 variants I have worked on ) pull the spd brk lever fully aft past the flt splr mark.None I am familiar with have a physical detent.
But you will only get flt splrs regardless of handle position.
You need (as per previous post) w on w (rh gear) and wheel spin up (60 knots I think it is and or reverse selected in certain conditions) to get the actual splr panels past the flt position.
So , from memory, you'd need a few failures to get gnd splrs in the air (never seen it thankfully)
You can physically select gnd splrs but it wont go there in a normal serviceable aircraft in flt.
But you will only get flt splrs regardless of handle position.
You need (as per previous post) w on w (rh gear) and wheel spin up (60 knots I think it is and or reverse selected in certain conditions) to get the actual splr panels past the flt position.
So , from memory, you'd need a few failures to get gnd splrs in the air (never seen it thankfully)
You can physically select gnd splrs but it wont go there in a normal serviceable aircraft in flt.
Joined: Apr 2005
Posts: 569
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From: Stockholm Sweden
You need (as per previous post) w on w (rh gear) and wheel spin up (60 knots I think it is and or reverse selected in certain conditions) to get the actual splr panels past the flt position.
The ground spoilers are actuated when the spoiler lever is pulled to the ground spoiler posn, and the right MLG oleo is compressed. This compression moves a teleflex cable that opens the ground spoiler valve and ports hyd fluid to the ground spoilers. The ground spoilers will only move if this valve is open, and are only UP or DOWN.
Flight spoilers are always active, and can and will go to full travel in flight. On the B737 the flights spoilers are controlled by big mechanical devices in the wheel bay, The spoiler mixer, and the ratio changer. The spoiler mixer is a wonder of 60's design and extremely complicated inside.
Auto ground spoilers operate with aircraft on ground (same valve open) and wheel spin up. They will also operate with thrust reverse selection.
So if the teleflex cable failed in the ground position, you could get ground spoilers in flight, but only if you pull the spoiler handle back passed the flight posn. You would have other failures as well as the ground prox sensors are bolted on top of the ground spoiler selector valve, and controlled by the same cable. You can see this in the right wheel bay.
I have seen this happen. Very embarrassing as it was my mistake!
Joined: Jul 2008
Posts: 1,146
Likes: 31
From: Skating away on the thin ice of a new day.
g'ay steve, yes I had it surrounded but not quite there.wheel spin up for auto splrs.But still need the vlv in the gnd position to get gnd splrs regardless
thanks for that.
some above were saying they have used gnd splrs in flt and or do select beyond the flt part of the quadrant.One day you day get what you select!
thanks for that.
some above were saying they have used gnd splrs in flt and or do select beyond the flt part of the quadrant.One day you day get what you select!
