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What is the reason for setting flaps 1 on the ground at high temperatures?

Why are flaps retracted when an aircraft is parked on ground?Do all A320-family planes have leading edge high lift devices?Is the altimeter setting corrected for temperature?Why are flaps retracted when an aircraft is parked on ground?What's the reason for the local flap extensions at the shockbody locations?Is it normal for the flaps to move like this?How do the uninterrupted and interrupted flaps compare?Why are the outboard Krueger Flaps retracted before the others on the B747?What are the benefits of using thick trailing edge flaps?How does setting takeoff flaps improve aircraft performance?What backup systems are in place for flaps actuated by sliding block guides?Is it normal procedure to lower flaps at high altitudes?

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17

$begingroup$

Yesterday I've seen an A320 standing at the gate with flaps 1. While this question answers, why the flaps should be up, is there any reason to retract the flaps to 1 instead of up?

In addition it seems to apply only in high temperatures (30°C, and rising yesterday). As well in this pilot eyes video the FO confirms the temperature (31°C) before setting flaps to 1 as they taxi to the gate.

I've seen this only on the A320 (yesterday) and on the A330 (in the video). Does this apply only on Airbus aircraft or as well on others?

airbus flaps temperature

share|improve this question

edited Jun 9 at 16:46

Ralph J

29.5k99 gold badges9393 silver badges152152 bronze badges

asked Jun 9 at 3:52

merspielermerspieler

19788 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Never heard of anything like that in the 737. I'm entirely mystified as to what that might accomplish.
  $endgroup$
  – Ralph J
  Jun 9 at 16:45
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Are you positive that you saw the flaps, and not the slats? (Compare ymb1's answer, which discusses the slats.)
  $endgroup$
  – a CVn
  Jun 9 at 21:21
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @aCVn: Config 1 selected on ground is called 1+F, comes with a bit of flaps. See aviation.stackexchange.com/q/51338/14897
  $endgroup$
  – ymb1
  Jun 9 at 21:53
  

  
  
  
  

add a comment | 

17

$begingroup$

Yesterday I've seen an A320 standing at the gate with flaps 1. While this question answers, why the flaps should be up, is there any reason to retract the flaps to 1 instead of up?

In addition it seems to apply only in high temperatures (30°C, and rising yesterday). As well in this pilot eyes video the FO confirms the temperature (31°C) before setting flaps to 1 as they taxi to the gate.

I've seen this only on the A320 (yesterday) and on the A330 (in the video). Does this apply only on Airbus aircraft or as well on others?

airbus flaps temperature

share|improve this question

edited Jun 9 at 16:46

Ralph J

29.5k99 gold badges9393 silver badges152152 bronze badges

asked Jun 9 at 3:52

merspielermerspieler

19788 bronze badges

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Never heard of anything like that in the 737. I'm entirely mystified as to what that might accomplish.
  $endgroup$
  – Ralph J
  Jun 9 at 16:45
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Are you positive that you saw the flaps, and not the slats? (Compare ymb1's answer, which discusses the slats.)
  $endgroup$
  – a CVn
  Jun 9 at 21:21
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @aCVn: Config 1 selected on ground is called 1+F, comes with a bit of flaps. See aviation.stackexchange.com/q/51338/14897
  $endgroup$
  – ymb1
  Jun 9 at 21:53
  

  
  
  
  

add a comment | 

$begingroup$

Yesterday I've seen an A320 standing at the gate with flaps 1. While this question answers, why the flaps should be up, is there any reason to retract the flaps to 1 instead of up?

In addition it seems to apply only in high temperatures (30°C, and rising yesterday). As well in this pilot eyes video the FO confirms the temperature (31°C) before setting flaps to 1 as they taxi to the gate.

I've seen this only on the A320 (yesterday) and on the A330 (in the video). Does this apply only on Airbus aircraft or as well on others?

airbus flaps temperature

share|improve this question

edited Jun 9 at 16:46

Ralph J

29.5k99 gold badges9393 silver badges152152 bronze badges

asked Jun 9 at 3:52

merspielermerspieler

19788 bronze badges

$endgroup$

share|improve this question

edited Jun 9 at 16:46

Ralph J

29.5k99 gold badges9393 silver badges152152 bronze badges

asked Jun 9 at 3:52

merspielermerspieler

19788 bronze badges

share|improve this question

edited Jun 9 at 16:46

Ralph J

29.5k99 gold badges9393 silver badges152152 bronze badges

asked Jun 9 at 3:52

merspielermerspieler

19788 bronze badges

edited Jun 9 at 16:46

Ralph J

29.5k99 gold badges9393 silver badges152152 bronze badges

edited Jun 9 at 16:46

Ralph J

29.5k99 gold badges9393 silver badges152152 bronze badges

asked Jun 9 at 3:52

merspielermerspieler

19788 bronze badges

asked Jun 9 at 3:52

merspielermerspieler

19788 bronze badges

2 Answers
2

active

oldest

votes

29

$begingroup$

From the A320 Flight Crew Operating Manual (FCOM):

And the image to text:

On ground, hot weather conditions may cause overheating to be detected around the bleed ducts in the wings, resulting in “AIR L (R) WING LEAK” warnings. Such warnings may be avoided during transit by keeping the slats in Configuration 1 when the OAT is above 30 °C.

(Emphasis mine)

Basically it lets the leading edge anti-ice [hot air] leak sensors breathe, and not display a false positive.

Note that moving the lever to 1 from 0 or 2 at slow speeds (on ground) is called config 1+F, which deploys the flaps as well as the slats (see below).

share|improve this answer

edited Jun 9 at 22:01

answered Jun 9 at 17:14

ymb1ymb1

75.4k99 gold badges245245 silver badges405405 bronze badges

$endgroup$

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  So when do you retract the flaps to 0? When you leave the gate, are ready for takeoff, in the air, or ?
  $endgroup$
  – Bob Jarvis
  Jun 9 at 21:11
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  @BobJarvis: It would depend on the takeoff configuration, it varies. More than config 1 could be needed. Flaps and slats are set for takeoff usually after pushback. And note the above applies to a transit, i.e., not the last day's flight.
  $endgroup$
  – ymb1
  Jun 9 at 21:45
  
  

  
  
  
  

add a comment | 

4

$begingroup$

I’ve been flying several types of Airbuses for the past decade and have never seen this kind of procedure before. There certainly is no such limitation in the manuals.

In general, it sometimes happen that there has been such a practice in a previous aircraft type the company has operated and these kind of procedures carry on as best practices or company procedures without any “real” reason.

share|improve this answer

answered Jun 9 at 5:34

busdriverbusdriver

1,2171212 bronze badges

$endgroup$

• 
  
  
  

  
  13
  

  
  
  
  
  
  

  
  $begingroup$
  Well, I stand corrected! See correct answer above.
  $endgroup$
  – busdriver
  Jun 9 at 21:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you, extrapolating procedures from an aircraft model to another does not comply with the rules of the art.
  $endgroup$
  – user40476
  Jun 10 at 9:33
  

  
  
  
  

add a comment | 

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29

$begingroup$

From the A320 Flight Crew Operating Manual (FCOM):

And the image to text:

On ground, hot weather conditions may cause overheating to be detected around the bleed ducts in the wings, resulting in “AIR L (R) WING LEAK” warnings. Such warnings may be avoided during transit by keeping the slats in Configuration 1 when the OAT is above 30 °C.

(Emphasis mine)

Basically it lets the leading edge anti-ice [hot air] leak sensors breathe, and not display a false positive.

Note that moving the lever to 1 from 0 or 2 at slow speeds (on ground) is called config 1+F, which deploys the flaps as well as the slats (see below).

share|improve this answer

edited Jun 9 at 22:01

answered Jun 9 at 17:14

ymb1ymb1

75.4k99 gold badges245245 silver badges405405 bronze badges

$endgroup$

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  So when do you retract the flaps to 0? When you leave the gate, are ready for takeoff, in the air, or ?
  $endgroup$
  – Bob Jarvis
  Jun 9 at 21:11
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  @BobJarvis: It would depend on the takeoff configuration, it varies. More than config 1 could be needed. Flaps and slats are set for takeoff usually after pushback. And note the above applies to a transit, i.e., not the last day's flight.
  $endgroup$
  – ymb1
  Jun 9 at 21:45
  
  

  
  
  
  

add a comment | 

29

$begingroup$

From the A320 Flight Crew Operating Manual (FCOM):

And the image to text:

On ground, hot weather conditions may cause overheating to be detected around the bleed ducts in the wings, resulting in “AIR L (R) WING LEAK” warnings. Such warnings may be avoided during transit by keeping the slats in Configuration 1 when the OAT is above 30 °C.

(Emphasis mine)

Basically it lets the leading edge anti-ice [hot air] leak sensors breathe, and not display a false positive.

Note that moving the lever to 1 from 0 or 2 at slow speeds (on ground) is called config 1+F, which deploys the flaps as well as the slats (see below).

share|improve this answer

edited Jun 9 at 22:01

answered Jun 9 at 17:14

ymb1ymb1

75.4k99 gold badges245245 silver badges405405 bronze badges

$endgroup$

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  So when do you retract the flaps to 0? When you leave the gate, are ready for takeoff, in the air, or ?
  $endgroup$
  – Bob Jarvis
  Jun 9 at 21:11
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  @BobJarvis: It would depend on the takeoff configuration, it varies. More than config 1 could be needed. Flaps and slats are set for takeoff usually after pushback. And note the above applies to a transit, i.e., not the last day's flight.
  $endgroup$
  – ymb1
  Jun 9 at 21:45
  
  

  
  
  
  

add a comment | 

$begingroup$

From the A320 Flight Crew Operating Manual (FCOM):

And the image to text:

On ground, hot weather conditions may cause overheating to be detected around the bleed ducts in the wings, resulting in “AIR L (R) WING LEAK” warnings. Such warnings may be avoided during transit by keeping the slats in Configuration 1 when the OAT is above 30 °C.

(Emphasis mine)

Basically it lets the leading edge anti-ice [hot air] leak sensors breathe, and not display a false positive.

Note that moving the lever to 1 from 0 or 2 at slow speeds (on ground) is called config 1+F, which deploys the flaps as well as the slats (see below).

share|improve this answer

edited Jun 9 at 22:01

answered Jun 9 at 17:14

ymb1ymb1

75.4k99 gold badges245245 silver badges405405 bronze badges

$endgroup$

share|improve this answer

edited Jun 9 at 22:01

answered Jun 9 at 17:14

ymb1ymb1

75.4k99 gold badges245245 silver badges405405 bronze badges

answered Jun 9 at 17:14

ymb1ymb1

75.4k99 gold badges245245 silver badges405405 bronze badges

answered Jun 9 at 17:14

ymb1ymb1

75.4k99 gold badges245245 silver badges405405 bronze badges

4

$begingroup$

I’ve been flying several types of Airbuses for the past decade and have never seen this kind of procedure before. There certainly is no such limitation in the manuals.

In general, it sometimes happen that there has been such a practice in a previous aircraft type the company has operated and these kind of procedures carry on as best practices or company procedures without any “real” reason.

share|improve this answer

answered Jun 9 at 5:34

busdriverbusdriver

1,2171212 bronze badges

$endgroup$

• 
  
  
  

  
  13
  

  
  
  
  
  
  

  
  $begingroup$
  Well, I stand corrected! See correct answer above.
  $endgroup$
  – busdriver
  Jun 9 at 21:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you, extrapolating procedures from an aircraft model to another does not comply with the rules of the art.
  $endgroup$
  – user40476
  Jun 10 at 9:33
  

  
  
  
  

add a comment | 

4

$begingroup$

I’ve been flying several types of Airbuses for the past decade and have never seen this kind of procedure before. There certainly is no such limitation in the manuals.

In general, it sometimes happen that there has been such a practice in a previous aircraft type the company has operated and these kind of procedures carry on as best practices or company procedures without any “real” reason.

share|improve this answer

answered Jun 9 at 5:34

busdriverbusdriver

1,2171212 bronze badges

$endgroup$

• 
  
  
  

  
  13
  

  
  
  
  
  
  

  
  $begingroup$
  Well, I stand corrected! See correct answer above.
  $endgroup$
  – busdriver
  Jun 9 at 21:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you, extrapolating procedures from an aircraft model to another does not comply with the rules of the art.
  $endgroup$
  – user40476
  Jun 10 at 9:33
  

  
  
  
  

add a comment | 

$begingroup$

I’ve been flying several types of Airbuses for the past decade and have never seen this kind of procedure before. There certainly is no such limitation in the manuals.

In general, it sometimes happen that there has been such a practice in a previous aircraft type the company has operated and these kind of procedures carry on as best practices or company procedures without any “real” reason.

share|improve this answer

answered Jun 9 at 5:34

busdriverbusdriver

1,2171212 bronze badges

$endgroup$

share|improve this answer

answered Jun 9 at 5:34

busdriverbusdriver

1,2171212 bronze badges

answered Jun 9 at 5:34

busdriverbusdriver

1,2171212 bronze badges

answered Jun 9 at 5:34

busdriverbusdriver

1,2171212 bronze badges