Finally, {HEAD ~ this arrangement} facilitates {TAIL ~ maintenance operations}, as a service engineer can visually monitor the elevator car or the shaft itself from the drive system 
facilitates
Finally , { HEAD ~ this arrangement } facilitates { TAIL ~ maintenance operations } , as a service engineer can visually monitor the elevator car or the shaft itself from the drive system
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH