Hi, 

When selecting Flap 1 in the air, only the slats should extend. However in the sim the airctaft is extending both the slats and flaps. This is incorrect. 

On the ground, selecting Flap 1 extends both slats and flaps - this is correct in the sim. 

 

On 4/19/2025 at 10:07 AM, jw4821 said:

Hi, 

When selecting Flap 1 in the air, only the slats should extend. However in the sim the airctaft is extending both the slats and flaps. This is incorrect. 

On the ground, selecting Flap 1 extends both slats and flaps - this is correct in the sim. 

 

Now don’t hundred percent quote me on that but what you are saying is half true. It’s speed dependant, if you look on the main instrument panel between the CPT’s display unit and the center display unit you will see on the placard that the SLATS extend I believe at 250 knots while the FLAPS actually only extend at lower speed (I am going off my head so I can’t remember exact values here). However if you are slow enough when you move the FLAP lever to 1, both slats and flaps will extend.

Edited April 20, 20251 yr by Balint

27 minutes ago, Balint said:

Now don’t hundred percent quote me on that but what you are saying is half true. It’s speed dependant, if you look on the main instrument panel between the CPT’s display unit and the center display unit you will see on the placard that the SLATS extend I believe at 250 knots while the FLAPS actually only extend at lower speed (I am going off my head so I can’t remember exact values here). However if you are slow enough when you move the FLAP lever to 1, both slats and flaps will extend.

Hi, 

Thanks for your comment but you’re incorrect. The placard is just for reference, it has no bearing on flap movement. 
 

1 and 1 + F are listed separately as they’re separate flap configurations depending on the phase of flight - landing and takeoff respectively. 

Have a look at the below video at 3 mins 10 seconds. Flap 1 is selected and the indications shows only the slats extend.