?? asked this question: (deleted)?
If speed indication fails (for whatever reason) then rudder limitation stops. Am I right? if that's the case, how on earth (on air) a pilot would know how much rudder could apply without breaking it? Even more, in FBW a/cs, where pumps and fluids can creat a LOT of force, wouldn't this become super critical? Same question applies to the case of using "alternate law".
Because besides the RTLU (Rudder Travel Limiter) there is also a PTLU (Pedal Travel Limiter) - limiting mech(cable) pedal input to rudder servo jacks - in this 'classic' Yaw control system.
In the 'Enhanced' version there is no mech(cable) backup so also no RTLU/PTLU.
Art feel and Trim is directly on Pedals by a PFTU.
RTLU/PTLU in this 'classic' version and also PFTU 'in the enhanced version' are driven by SEC1 (SEC2 as backup) an this has nothing to do with - LAW- configuration.
Rudder Travel Limiter is mounted on the VS rear spar above the upper servo jack (
so is retrieved within the VS and last position soon to be known by the investigators)
The Pedal Travel Limiter however is mounted in the THS compartment.
A330 tech.