This SAE Aerospace Standard (AS) applies to performance and testing of solid chemical oxygen generators which produce oxygen at essentiall ambient pressure for use aboard aircraft whose cabin pressure altitude does not exceed 40,000 ft (about 12,200 m). Portable chemical oxygen devices are covered by AS1303.
SAE AS1304B-2014 Referenced Document
RTCA DO-160G-2010 Minimum Operational Performance Standard for Offshore Helicopter Terrain Awareness and Warning System (HTAWS)
SAE ARP1894-1987 Useful Life Determination Chemical Oxygen Generators