is this real and correct? landing gear brake

[bin801]

During my landing, after landing gear are down, I forgot reset the handle back to neutral position. (it supposed to be set neutral after gear down, right?) after fishbed touch down, I still have hydroulic power for gear brake.

 

is this real ? or bug?

[snapsimo]

I think you are correct. The gear lever is placed down to lower the gear and then, once they are down and locked, lever placed back in neutral to stop hydraulic pump working when it doesn't need to.

[Flagrum]

I am not sure that pressure air is still used up once the gear is down - what would it be used for? I only know that pressure air is used up slowly if you retract the gear and forget to put the lever back to neutral: when retracting, the wheels are braked and kept being braked as long as the lever is in the up position.

[Rotorhead]

Not completely sure without checking with the manual, but I am pretty confident that you have to set the handle back into neutral only after gears up. After you set your gear down you simply leave it there.

 

As Flagrum noted, there is most likely no need for any compressed air (not hydraulic) to be used up after gear down. And besides that, there are good safety reasons not to touch you gear handle after you've set it down for landing.

[xxJohnxx]

Not completely sure without checking with the manual, but I am pretty confident that you have to set the handle back into neutral only after gears up. After you set your gear down you simply leave it there.

 

Correct.

[bin801]

Not completely sure without checking with the manual, but I am pretty confident that you have to set the handle back into neutral only after gears up. After you set your gear down you simply leave it there.

 

As Flagrum noted, there is most likely no need for any compressed air (not hydraulic) to be used up after gear down. And besides that, there are good safety reasons not to touch you gear handle after you've set it down for landing.

 

I see

thank you and all!!

[Art-J]

Errr.... I don't know about You guys, but I prefer to have my drag chute and wheel brakes operational ESPECIALLY after touchdown, so saying that "there's no need for any compressed air to be used after gear down" sounds... hmm... adventurous to say the least :D.

 

As a reminder: gear up/down - hydraulic system, wheel brakes and drag chute - pneumatic system.

Edited December 28, 2014 by Art-J

[xxJohnxx]

Errr.... I don't know about You guys, but I prefer to have my drag chute and wheel brakes operational ESPECIALLY after touchdown, so saying that "there's no need for any compressed air to be used after gear down" sounds... hmm... adventurous to say the least :D.

 

Hi,

 

I think you are misunderstanding something here.

 

When you put the gear-lever in the UP position, the gear-brakes will apply to stop the wheels from spinning*. The brakes use compressed air.

Therefore, if you leave the gear-lever in the UP position, you will lose compressed air -> Bad

Solution: You put the lever in the MIDDLE position, where the brakes won't be applied any longer.

 

If you put the gear lever in the DOWN position, the system doesn't automatically apply brakes, so you won't consume any compressed air.

*The reasons for that can be various.

On one hand, rotating wheels will introduce vibrations (quit strong

vibrations).

On the other hand you probably don't want a wheel rotating at ~270km/h being pressed against the gear bay or the landing gear doors.

[bin801]

Except draw landing gear up and stop them spin, after retard, the compressed air will also be used by landing gear brake, yes? or maybe not?

my question should be: After retard, if I leave handle at down position, will the brake work for gears?

and I also want to know

what is the offical regulation? and day to day, what did 21 pilots do ?

thanks

[bin801]

Errr.... I don't know about You guys, but I prefer to have my drag chute and wheel brakes operational ESPECIALLY after touchdown, so saying that "there's no need for any compressed air to be used after gear down" sounds... hmm... adventurous to say the least :D.

 

As a reminder: gear up/down - hydraulic system, wheel brakes and drag chute - pneumatic system.

 

I thought those wheel brakes need compress air from that system. I am not sure, I thought so I want make sure.

 

In more than 50% landing practice I did, I land without using drag chut. I thought if I could land and stop without chut, no accident, landing with chut will be easier. and maybe more and more good landing. I am torturing myself,:D

[Art-J]

Hi,

 

I think you are misunderstanding something here.

 

When you put the gear-lever in the UP position, the gear-brakes will apply to stop the wheels from spinning*. The brakes use compressed air.

Therefore, if you leave the gear-lever in the UP position, you will lose compressed air -> Bad

Solution: You put the lever in the MIDDLE position, where the brakes won't be applied any longer.

 

If you put the gear lever in the DOWN position, the system doesn't automatically apply brakes, so you won't consume any compressed air.

 

Oh I understand it perfectly and position of the lever was not my point. Just wanted to comment on two confusing replies above, which are worded in such a way that novice MiG flyer might understand them as "compressed air is not important/necessary for anything after lowering gear", which is not the case.

[xxJohnxx]

Oh I understand it perfectly and position of the lever was not my point. Just wanted to comment on two confusing replies above, which are worded in such a way that novice MiG flyer might understand them as "compressed air is not important/necessary for anything after lowering gear", which is not the case.

 

Okay got you. Thanks for clarifying!