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Speed Brake


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#1 ap1190

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Posted 06 January 2009 - 09:34 AM

Hi,

Do we need to Arm the speed brakes on approach? I think i remember reading somewhere that they armed automatically but also read they could be armed manually.

Thanks
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#2 ECAM_STATUS

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Posted 06 January 2009 - 10:57 AM

SOPs state that the speed brakes should be armed manually. it is important to arm the speed brakes because, x amount of seconds after the speed brakes are deployed the auto brakes kick in (depending on which one you select ie. LOW, MED). However the speed breaks will deploy once reverse thrust is used regardless of the lever position.

hope that helps

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#3 ap1190

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Posted 06 January 2009 - 11:36 AM

Oh O.K thankyou,

so if i don't arm them manually the autobrake won't engage?
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#4 A32x Flier

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Posted 06 January 2009 - 02:36 PM

I guess you're are mixing groundspoiler, speedbrakes and autobrake...


SPEEDBRAKE CONTROL

The pilot controls the speedbrakes with the speed brake lever.
The speedbrakes are actually spoilers 2, 3 and 4.
Speedbrake extension is inhibited if:

  - SEC1 and SEC3 both have faults.
  - An elevator (L or R) has a fault (in this case only spoilers 3 and 4 are inhibited).
  - Angle-of-attack protection is active.
  - Flaps are in configuration FULL.
  - Thrust levers above MCT position
  - Alpha floor activation

If an inhibition occurs when the speedbrakes are extended, they retract automatically and stay retracted until the inhibition condition disappears and the pilots reset the lever. (The speedbrakes can be extended again 10 seconds or more after the lever is reset). When a speedbrake surface on one wing fails, the symmetric one on the other wing is inhibited.


Note:
1. For maintenance purposes, the speedbrake lever will extend the N

#5 Nik Efimov

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Posted 06 January 2009 - 05:32 PM

to summarize what A32x Flyer said, they will auto-deploy even if not armed provided that at least one engine is in reverse while the other one is at or near IDLE (or both engines in Reverse).

#6 A32x Flier

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Posted 06 January 2009 - 06:09 PM

Exactly, thanks Nick to summarize, I writting too long each time... And to finish (for your info), if one engine is in reverse and the other above IDLE notch, ground spoilers won't deploy (same situation than TAM A320 accident in Sao Paulo).

#7 Ali Hoteit

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Posted 07 January 2009 - 12:29 AM

What about Anti-Skid ? .What is it ? and why do they turn it off during pushback, on the A330 at least ..
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#8 ap1190

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Posted 07 January 2009 - 12:40 AM

Ah i see,

Thanks A32x Flier and Nik and Ecam Status. It is all clearer now.
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#9 Nik Efimov

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Posted 07 January 2009 - 03:46 PM

A/SKID is similar to an ABS you see on cars: it does not allow the wheels to "lock up" while braking.
During pushback, they actually disconnect Nosewheel Steering (NWS), it just happens to be on the same switch with A/SKID. NWS is disconnected to de-powerize nosewheel steering mechanism so it can rotate freely while pushing back.

#10 ouchpotato

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Posted 29 January 2009 - 04:33 PM

View PostNik Efimov, on Jan 7 2009, 03:46 PM, said:

A/SKID is similar to an ABS you see on cars: it does not allow the wheels to "lock up" while braking.
During pushback, they actually disconnect Nosewheel Steering (NWS), it just happens to be on the same switch with A/SKID. NWS is disconnected to de-powerize nosewheel steering mechanism so it can rotate freely while pushing back.

That brings up an interesting question of what will happen when you initiate pushback on the airsimmer having forgotten to disconnect nws - will flight sim fail to turn the aircraft? (i'm assuming if you fail to turn it back on again, the airsimmer will sail on past the taxiway you meant to turn onto...?)
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#11 Nik Efimov

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Posted 29 January 2009 - 06:42 PM

The ground crew inserts a gear pin, disconnecting NWS ;)

#12 GNJFB

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Posted 29 January 2009 - 07:43 PM

Nik while on this subject, dont know if it was answered, u know on touchdown, theres that slight delay in which the speedbrake deploys coz on some other a/c they come up right away and it takes it all away as in realism, watch this vid and let me know if u know get what I mean



http://uk.youtube.co...h?v=fG_bLkIK6Lk
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#13 Nik Efimov

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Posted 29 January 2009 - 08:12 PM

They come up instantly in the vid?

#14 GNJFB

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Posted 29 January 2009 - 08:39 PM

View PostNik Efimov, on Jan 29 2009, 08:12 PM, said:

They come up instantly in the vid?

LoL I dont think so watch this one, main gear touches and then slight delay in them being deployed

http://uk.youtube.co...feature=related

May even notice it better on this one

http://uk.youtube.co...feature=related

PS loving the quick replies mate :)
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#15 Anuj

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Posted 30 January 2009 - 06:41 PM

I think what he means is that the speedbrakes don't deploy instantly. They deploy slowly. They don't just pop up. They gradually come up ?
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#16 Nik Efimov

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Posted 30 January 2009 - 07:39 PM

Alright, NJFB, we'll see what we can do  :ph34r:

#17 TheCosmicFrog

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Posted 30 January 2009 - 09:23 PM

In a perfect world, the ground spoilers would come up as soon as the main gear touches the ground, since this would "pin" the aircraft to the ground and prevent ballooning.
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#18 GNJFB

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Posted 31 January 2009 - 09:03 AM

View PostNik Efimov, on Jan 30 2009, 07:39 PM, said:

Alright, NJFB, we'll see what we can do  :ph34r:

Cheers Nik

View PostTheCosmicFrog, on Jan 30 2009, 09:23 PM, said:

In a perfect world, the ground spoilers would come up as soon as the main gear touches the ground, since this would "pin" the aircraft to the ground and prevent ballooning.

Well dont know what Airbus have done but it dont appear to do that from where im looking  :P
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#19 sg38

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Posted 01 February 2009 - 10:23 PM

>In a perfect world, the ground spoilers would come up as soon as the main gear touches the ground, since this would "pin" the aircraft to the ground and prevent ballooning.

Ballooning only happens in the air e.g. when extending the flaps at high speed.
I've seen quite a few planes becoming airborne again after the initial touchdown with EXTENDED ground spoilers ;)

#20 TheCosmicFrog

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Posted 07 February 2009 - 02:58 PM

View PostGNJFB, on Jan 31 2009, 09:03 AM, said:

View PostTheCosmicFrog, on Jan 30 2009, 09:23 PM, said:

In a perfect world, the ground spoilers would come up as soon as the main gear touches the ground, since this would "pin" the aircraft to the ground and prevent ballooning.

Well dont know what Airbus have done but it dont appear to do that from where im looking  :P

Haha, too bad it's not a perfect world!  :lol:
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