Specifies and classifies the design, performance and testing requirements for portable protective breathing equipment for use by crew during specified emergency conditions on board an aircraft.Cross References:2G 2292N22N33N 100BS 476:Part 13YBS 4667:Part 4YBS 4667:Part 5YCAA Specification No.8JAR 25Euroca ED 14/DD 160Eurocae ED-65