I am trying hard to understand this:
If you leave one of the TL's in CL on touchdown you get:
i)AT disarms when you select the other TL to rev idle
ii)a repetitive RETARD(this is the only warning that you have forgotten to retard the other TL-no stopgap interlock to prevent you having fwd &rev thrust simultaneously??))
iii)no moving spoiler handle-only by referring to the screen do you get confirmation of spoiler actuation(tactile feedback problem..in a conventional a/c the spoiler handle physically moves-you feel it,you hear it,you see it with peripheral vision)
iv)the forgotten TL stays in the position you left it when AT disarmed and the FADEC commands forward thrust at that setting(even though the other eng is now commanding rev thrust???)..huge design problem here..
v)when do you get gnd spoilers?LEFT squat switch and both TL's in IDLE???
vi)does autobrake look for the same logic conditions as gnd spoilers?
On a conventional a/c,the logic conditions are:
a)flight spoilers on wheel spin up
b)gnd spoilers on squat switch
c)rev thrust below 10'RA BUT BOTH TL's at idle(this is the key interlock..you cant have one eng producing forward thrust and one reverse thrust)
If a pilot in his haste to stop on a short wet runway forgets to retard a TL but the aircraft allows him to engage the retarded TL in rev and denies him spoilers/autobrake,is this pilot or design error?Why let the pilot get stuck between a rock and a hard place?If hes forgotten to retard,deny him everything,that way he wont get swing(how can you brake manually with asymmetric thrust-you'll need rudder),he wont get retardation and he must abort the landing.