At typical mid-flight enroute weights, the L-1011 (specific model depending on the engines installed) will drift down to around 10,000 MSL with two engines inop.
Two engines inop go-arounds are also possible, if light enough (and started high enough), and the ambient temperature is reasonable.
In the latter case, two engine inop autolands are also possible, using Flap 10, depending on hydraulic system(s) status.
L-1011, a very systems redundant aeroplane.