Spoiler automatically deployed
Thread Starter
Join Date: Apr 2008
Location: Test
Age: 35
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Spoiler automatically deployed
Hi,
Guess many of you have seen this.
This is new to me. Never seen this before. How does this work? I know that the spoilers deployed due to the wind. What's the purpose and where can I find this in the FCTM?
Thanks
Guess many of you have seen this.
This is new to me. Never seen this before. How does this work? I know that the spoilers deployed due to the wind. What's the purpose and where can I find this in the FCTM?
Thanks
Per Ardua ad Astraeus
Join Date: Mar 2000
Location: UK
Posts: 18,579
Likes: 0
Received 0 Likes
on
0 Posts
Even allowing for it being an AB, I reckon the ship needs checking for spoiler float.
PS Don't waste your time on the whole video, watch from 13:00 for about 1 minute.
PS Don't waste your time on the whole video, watch from 13:00 for about 1 minute.
Join Date: Apr 2013
Location: cloud 9
Posts: 51
Likes: 0
Received 0 Likes
on
0 Posts
hmm this is unusual .
The spoilers seem to acting independently of the aileron , so i dont think they came out for roll control.
maybe the crew used the spoilers for some reason ? cant really say for sure without looking at the other wing.
The spoilers seem to acting independently of the aileron , so i dont think they came out for roll control.
maybe the crew used the spoilers for some reason ? cant really say for sure without looking at the other wing.
Join Date: May 2000
Location: Glorious West Sussex
Age: 76
Posts: 1,020
Likes: 0
Received 0 Likes
on
0 Posts
Interesting.
Spoilers 2,3&4 deflect upwards about five seconds after lift-off. These are the speed brake panels, selectable by the speed brake lever. For roll control Spoilers 2,3,4&5 operate together (have a look at HD US A320 out of Phoenix Sky Harbour, after T/O, on the same channel).
SEC3 controls spoiler 2, SEC1 controls spoilers 3&4..these two are at the same angle, a different angle to spoiler 2.
Deduction.... this is a small speed brake demand which occurs when Normal Law blends in after lift-off.
My GUESS as to why... Do United still disarm Ground Spoiler immediately on L/G retraction selection, or do they wait until Flaps Zero (airbus SOP since several years ago)? If the PM disarms the Ground Spoilers with a vigorous push it is possible to select a small speed brake demand without realising it...
Of course I could be completely wrong about the "why".
Spoilers 2,3&4 deflect upwards about five seconds after lift-off. These are the speed brake panels, selectable by the speed brake lever. For roll control Spoilers 2,3,4&5 operate together (have a look at HD US A320 out of Phoenix Sky Harbour, after T/O, on the same channel).
SEC3 controls spoiler 2, SEC1 controls spoilers 3&4..these two are at the same angle, a different angle to spoiler 2.
Deduction.... this is a small speed brake demand which occurs when Normal Law blends in after lift-off.
My GUESS as to why... Do United still disarm Ground Spoiler immediately on L/G retraction selection, or do they wait until Flaps Zero (airbus SOP since several years ago)? If the PM disarms the Ground Spoilers with a vigorous push it is possible to select a small speed brake demand without realising it...
Of course I could be completely wrong about the "why".
Thread Starter
Join Date: Apr 2008
Location: Test
Age: 35
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
seems like this is new to most of the people here.
Yeah, the spoilers seemed to deploy automatically. Can this be done in strong wings? Company SOP allows this?
And how do they help in aerodynamics if there is a strong headwind? Won't the deployment of spoilers destroy some of the lift component?
Seasoned bus drivers? Care to comment?
Yeah, the spoilers seemed to deploy automatically. Can this be done in strong wings? Company SOP allows this?
And how do they help in aerodynamics if there is a strong headwind? Won't the deployment of spoilers destroy some of the lift component?
Seasoned bus drivers? Care to comment?
Join Date: Feb 2008
Location: Wingham NSW Australia
Age: 83
Posts: 1,343
Likes: 0
Received 0 Likes
on
0 Posts
Spoiler activity.
Don't know anything about Airbus, but it would seem to me that this is simply roll augmentation as a result of roll input by the pilot. If a large or rapid roll correction is needed the spoilers on the down-going wing will lift to reduce the lift on that wing. In the video the the spoilers first lift as the aircraft banks right.
Join Date: Jan 2001
Location: Around the world.
Age: 42
Posts: 606
Likes: 0
Received 0 Likes
on
0 Posts
The aileron is at times sat happily with its 5 degree droop with flap extended at its neutral position with the spoilers extended... it can't be for roll control.
I'm going with TyroPicard's explanation. I have seen it twice for real on the A320... once after takeoff, only noticed once the *bing* Ecam caution appeared to warn that the spoilers are extended against power and once leading to a high speed RTO during base training (Ecam threw up T/O config master warning). Airbus SOP changed to disarm ground spoilers now after flap retraction for this very reason.
Guessing here: With the T/O explanation I would think they received the ECAM caution fairly early on, but elected to have a look at it once things settled down a bit on departure.. which is a good thing with an amber caution... then once you have the aircraft on a safe trajectory have a look and diagnose.
I'm going with TyroPicard's explanation. I have seen it twice for real on the A320... once after takeoff, only noticed once the *bing* Ecam caution appeared to warn that the spoilers are extended against power and once leading to a high speed RTO during base training (Ecam threw up T/O config master warning). Airbus SOP changed to disarm ground spoilers now after flap retraction for this very reason.
Guessing here: With the T/O explanation I would think they received the ECAM caution fairly early on, but elected to have a look at it once things settled down a bit on departure.. which is a good thing with an amber caution... then once you have the aircraft on a safe trajectory have a look and diagnose.
Join Date: May 2000
Location: Glorious West Sussex
Age: 76
Posts: 1,020
Likes: 0
Received 0 Likes
on
0 Posts
Old Fella ... I agree that you don't know anything about airbus.
Roll demand uses four spoiler panels, speedbrakes use three. If it was a sustained roll demand the a/ c would keep rolling; it appears to be a commanded speedbrakes selection.
extricate ... There is no reason to use speedbrakes just after take-off .. you are right that is has a detrimental effect.
Roll demand uses four spoiler panels, speedbrakes use three. If it was a sustained roll demand the a/ c would keep rolling; it appears to be a commanded speedbrakes selection.
extricate ... There is no reason to use speedbrakes just after take-off .. you are right that is has a detrimental effect.
Join Date: Oct 1998
Location: CGK to HKG
Posts: 249
Likes: 0
Received 0 Likes
on
0 Posts
Upfloat
Even allowing for it being an AB, I reckon the ship needs checking for spoiler float.
Would have been unusual to have so many spoilers up floating....!
The comments about speedbrake slight input make interesting possibilities.
We don't see the left wing side to confirm other options.
Interesting.
Join Date: Mar 2008
Location: Above the Transition Level
Posts: 160
Likes: 0
Received 0 Likes
on
0 Posts
Totally agree a case of speed brake deployment on spoilers 2/3/4 so i'll throw a scenario out there...
"Positive Climb", "Gear Up" > Over enthusiastic disarming of the ground spoilers leading to knocking out to about 1/4 deployed unintentionally?
I'm not saying its Airbus SOP but could be a company thing.
Looks like they returned to normal during the clean up so probably saw the memo after the take off inhibit phase.
"Positive Climb", "Gear Up" > Over enthusiastic disarming of the ground spoilers leading to knocking out to about 1/4 deployed unintentionally?
I'm not saying its Airbus SOP but could be a company thing.
Looks like they returned to normal during the clean up so probably saw the memo after the take off inhibit phase.
Last edited by ElitePilot; 29th Sep 2014 at 13:18.
Join Date: Nov 2006
Location: Tropics
Posts: 360
Likes: 0
Received 0 Likes
on
0 Posts
In the not to distant past Airbus SOPs were to disarm the spoilers after gear retraction (now it's after flap retraction). Agree with the scenario of the PNF disarming the spoilers too enthusiastically ending up pulling the lever back slightly. Done it before myself. 
Join Date: Mar 2008
Location: Above the Transition Level
Posts: 160
Likes: 0
Received 0 Likes
on
0 Posts
Yeah I know that's why I thought of it, me too. I have OCD though so I always give it a nudge to ensure it's stowed after 
Let's not get started on climb performance!
Let's not get started on climb performance!
Join Date: Jun 2014
Location: Village of Santo Poco
Posts: 876
Likes: 0
Received 0 Likes
on
0 Posts
Our procedure still is to disarm them with gear retraction and arm with extension. In fact, we were taught "if you tough the gear lever, don't forget the spoiler lever".
Join Date: Feb 2008
Location: Wingham NSW Australia
Age: 83
Posts: 1,343
Likes: 0
Received 0 Likes
on
0 Posts
Spoilers
TyroPicard. By my own admission I know nothing of the Airbus. Your comment regarding that fact indicates that you know little about humility.
Join Date: May 2000
Location: Glorious West Sussex
Age: 76
Posts: 1,020
Likes: 0
Received 0 Likes
on
0 Posts
Old Fella..
Apologies if you don't like my banter.. I thought the smiley would indicate that it was just that. I spent about fifteen minutes with my head in the books to make sure my post no.4 was correct before posting it... and then all sorts of folk come up with different incorrect ideas. And some post the same correct answer as their own brilliant scenario... And so it goes...
Apologies if you don't like my banter.. I thought the smiley would indicate that it was just that. I spent about fifteen minutes with my head in the books to make sure my post no.4 was correct before posting it... and then all sorts of folk come up with different incorrect ideas. And some post the same correct answer as their own brilliant scenario... And so it goes...
