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Commercial Jets — Hydraulic System Contamination versus Airline Maintenance
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English
Abstract
This paper presents an outline of United Air Lines' investigations into hydraulic system contamination. It includes a discussion of aircraft hydraulic system performance in relation to contamination levels; development of maintenance procedures for foreign particle removal; measurement of existing contamination levels through visual, gravimetric, and automatic counter (HIAC) methods; and evaluation of a new two stage airborne filter.