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This rulemaking would amend certain airworthiness regulations applicable to cabin pressurization systems and oxygen dispensing equipment on transport category airplanes to allow certification of airplane designs intended for operations into or out of airports with elevations at or above 8,000 feet above sea level. Currently, the FAA makes and documents equivalent level of safety (ELOS) findings to the cabin pressurization requirements in section 25.841(a) and the cabin pressure altitude warning requirements in section 25.841(b)(6), when an airplane manufacturer or modifier proposes that the FAA certify cabin pressurization systems used on airplanes for operations into or out of airports with elevations at or above 8,000 feet. In addition, the FAA grants exemptions from the automatic oxygen mask presentation requirements in section 25.1447(c)(1) for operations into or out of airports with elevations at or above 13,000 feet. This rulemaking would relieve the burden on industry and the FAA that results from project specific ELOS requests and petitions for exemption to accommodate operations at high elevation airports for transport category airplanes.