Originally Posted by TyroPicard
For the "rejected landing" in Airbusspeak/touch and go, the ground spoilers will retract if one thrust lever is advanced above 20° .. so that's already taken care of.
Agreed. Here we're talking about precisely the case where one thrust lever is above "near idle", but manual braking should
still deploy ground spoilers.
So we consider very late rejected landing, immediately before or after touchdown, possibly one engine out, thus one thrust lever at idle, the other at TOGA, inadvertent brake inputs while compensating for asymmetric thrust with the rudder.
Ground spoilers or no? Probably no, because of TOGA.
But if the PF did not set TOGA thrust, thus one lever at idle, one at MCT (standard setting for A/THR with one engine out). (Remember Sochi, where the pilot perfomed a go-around without setting TOGA thrust, albeit at higher altitude.)
Compare to this case:
One thrust lever at reverse, the other at CL, manual braking.
Ground spoilers or no? Perhaps yes, because of reverse ...
We must be very careful about the conditions under which to deploy the ground spoilers. Is there a possible credible scenario with one TL at reverse, the other at cl, brake pedals pressed, where one does
not want to stop?
But they would still operate taxying out..... and would be extended if you held on the runway with the brakes on .. this might lead to taxying out with them "not armed" .. could they be forgotten thus adding to the risk?
We speculated before about the risk of failure to deploy ground spoilers when rejecting takeoff with two reversers inop, where SOP usually appears to be not to select reverse. So not arming ground spoilers for taxiing, forgetting to arm for take-off, and not selecting reverse in a reject: No ground spoilers during reject, which sounds like a very bad idea.
This problem, though, might be taken care off by the ground spoiler conditions during rejected take-off, namely wheels spinning >72kts, which would again allow for them to be armed during taxiing.
Bernd