Before passing your opinion here why don't you actually READ the report.
on the incident a/c made 5 full opposite deflections before the Fin failed. Cycling the rudder like that doesn't give the structure time to dissipate the loads induced by each deflection. The result is the loads build up to the point where the structure fails. In this case I believe the failed at over twice it's designed max load
The purpose of the rudder is to assist with:-
1. Lateral control on TO
Roll. especially in Xwind conditions
Ldg Flare with Xwind, de crab purposes
During Ldg Roll when on ground.
2. To counteract thrust assymetry
3. a) Cater for the loss of both Yaw Dampers
b) Rudder Trim Runaway
c) Landing with abnormal Ldg Gr position. The rudder then can be used for directional control on the ground.
All the NTSB is recommending is that input loads required to move the rudder are increased to slow the rate of movement and increase the amount of pedal movement required to fully deflect thr rudder.
The fin and rudder worked as advertised. Th PF
operated the controls incorrectly. I have spoken to several Boeing & Airbus pilots and they all said the AA
pilot was wrong to fly like that