A320 Flaps
Gentlemen,
Please reference Airbus FCOM 1.27.50 P5.
When on approach, transitioning from clean to dirty, the first "flap" increment is 'slats only'....that is to say, when you go from Flaps Zero to Flaps One, all you're putting out is slats (no flaps). The flap position, as depicted on the E/WD, shows "1" ..... not "1 + F".
Then, when selecting the next flap increment, i.e. "Flaps 2", you get trailing edge flaps going to the "2" position.
In terms of specific slat/flap movement, the following applies to the A-320: (The numbers are similar, but slightly different, for the A-321.)
POSITION SLATS FLAPS ECAM INDICATIONS
___________________________________________
0 0 0 (Slats/Flaps Up)
1 18 0 1
(This is during approach.)
1 18 10 1+F
(This is for takeoff.)
2 22 15 2
3 22 20 3
FULL 27 35 FULL
So, as we can see, there is a relatively large flap movement when working out flaps on approach, going from POSITION 1 to POSITION 2 (i.e. Zero to 15).
(Note: The 321 difference is with the flap...not the slat. This is due to the different flap design.)
I have no particular expertise in aeronautical engineering. I am just a 'driver', as most of us on this forum are. However, there are a few people on this forum who have extremely high levels of expertise and experience who can explain why you would get the pitch changes that you normally experience on the A-320 series Airbus when you move slats/flaps.
My personal opinion...and that's all it is...is that the pitch changes are normal and expected...as you'd get from any aircraft of this type of design...when moving slats/flaps.
PantLoad