SAE adopts recommended practice on bleed air purity

摘要

SAE International has adopted ARP4418A, an aerospace recommended practice that provides guidance to measure contaminant levels in engine bleed air used in aircraft environmental control systems. It is necessary to have a document such as ARP4418A to assist companies in showing compliance to applicable national and international regulations (FAA 14CFR Part 25.831 and EASA CS-25.831) when they are certifying breathing-air supplies from aircraft engines and auxiliary power units, said Richard Fox, the sponsor of ARP4418 who works as Staff Scientist for Honeywell Advanced Technology. The recommended practice makes a connection to the recognized European industry standard, PrEN4618, and the NIOSH (U.S. National Institute for Occupational Safety and Health) standard for total particulates, and their recommended allowable limits.