After {HEAD ~ the chassis} is in {TAIL ~ the open position}, a determination is made as to whether the chassis frame is equipped with a locking mechanism to keep the frame at a desired angle with respect to the enclosure  
is in
After { HEAD ~ the chassis } is in { TAIL ~ the open position } , a determination is made as to whether the chassis frame is equipped with a locking mechanism to keep the frame at a desired angle with respect to the enclosure
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH