English to Russian Tech/Engineering Engineering (general) Standard - Restraint Syst

Добрый день!
Помогите, пожалуйста, перевести "egion of extension" в следующем контексте:

8.8 Automatic Locking Retractor
Retractors shall be tested in a manner to permit the retraction forces to be determined exclusive of the gravitational forces
on hardware or webbing being retracted. The webbing shall be fully extended from the retractor. While the webbing is
being retracted, the average force of retraction with 305 mm ± 50 mm (12 in ± 2 in) of webbing on the spool shall be
determined and the webbing movement between adjacent locking segments shall be measured in the same region of
extension.

Заранее спасибо!