Originally Posted by
wiggy
Until JM comes back- I can't find a FCOM reference but certainly in the event of an RTO in the sim on both the aforementioned types the V speeds are "wiped" from the FMC, quite what the trigger is ( RTO autobrake operation, REV Thrust being selected, or sim re-position) I'm not sure...
From Ground Ops 2.5 in
an old Qatar 777 FCOM:
During taxi, the momentary use of idle reverse thrust may be needed on slippery surfaces for airplane control. The use of reverse thrust above reverse idle is not recommended due to the possibility of foreign object damage and engine surge.
Consider having the airplane towed rather than relying on the extended use of reverse thrust for airplane control.
Note: If reverse thrust is selected after V speeds have been entered, the V speeds are removed from the airspeed display, and full TO thrust becomes the thrust limit for takeoff.