Выражение встречается в следующем контексте:
The nominal length of movement to the aft to abut the end of the pipeline will be 1.5 [m] to 2.0 [m].
The powered module shall have a system for rolling the pipe forward and backward, with three modes of operation, selectable from the control console :
1. Manual, with continuous speed adjustability
2. Free-wheel
3. Automatic controlled continuous force towards aft, with adjustability.

Заранее спасибо