Oxygen Considerations for High Elevation Airport Operations (HEAO)
The scope of this document is to provide helpful information concerning the use of oxygen when flying into and out of high elevation airports. Normally for aircraft operations that fly at high altitude, oxygen requirements involving a decompression are generally easy to understand and follow because of the increased delta between cabin and ambient pressures. This document is intended to address a transition zone case where cabin and ambient pressures are closely the same and oxygen usage can be compounded by physiologic subjectivity that often may be accompanied by hypoxia. Operators who fly into these high altitude airports will be required to address in their operational manual the inherent issues associated with this transition zone. This document will provide adequate information to aid operators in checking that their procedures will best fit their safety needs with regards to hypoxia and ensure compliance with regulations.