Following is taken from the operating manual of A321neo:
When passing 100 ft RA, the THS is frozen and the normal flight mode changes to flare mode as the aircraft descends to land. The flare mode is essentially a direct stick-to-elevator law without auto trim, with some damping provided by load factor and pitch rate feedback. The flare law provides full elevator authority.
Compared to 50 ft for the ceo model, why is there a difference?
According to Airbus when they responded to leehamnews.com in 2019, the A321neo required flare law changes that are unrelated to the bigger engine, and the modified laws were in response to customer requests based on conditions discovered in simulator sessions.
The origin of the "excessive pitch" is associated to a reduction in efficiency of the angle of attack protection in a very remote combination of conditions, these being: The need for the crew to perform a dynamic manoeuver (such as a go around) AND the aircraft being below 100ft AND specific landing configuration AND a very aft CG. [emphasis added]
— Bjorn's Corner: Airbus' A321neo has a pitch-up issue (now with a second update). July 19, 2019. leehamnews.com.
While the article does not specifically mention the higher flare mode activation, this at least confirms flare-law differences that apply only to the A321neo.
