Filtration of Aircraft Hydraulic Systems: A Description of the Problems Encountered by Fairey in Developing a Suitable Filter for the Fairey F.D.2 Research Aircraft's Main Hydraulic System

FILTERS have been in use in one form or another throughout history. Despite this fact, there has been, until comparatively recent times, very little written upon the subject. Certainly, to the author's knowledge, there has been only a handful of papers written or read upon high‐pressure oil hydraulic filtration within the past decade. It was for aircraft hydraulic circuits that Fairey originally designed filters and only then because the Company failed to find a filter that fulfilled the stringent requirements we set down as representing the minimum standard demanded by our own hydraulic systems.