Hypoxia — private pilot, high altitude GA flight

Summary

A private pilot operating a Cessna 182T at FL145 without supplemental oxygen experienced incapacitation consistent with hypoxia during a mountain crossing flight near Canberra. The aircraft began a slow descent until the pilot recovered at approximately 9,000 ft. The pilot made an unplanned landing at Cooma Airport. No injuries.

Investigation Findings (4)

1. 01Investigation is ongoing.
2. 02The pilot had no supplemental oxygen on board.
3. 03CASA regulations require supplemental oxygen above FL125 when flight crew are not using pressurisation.
4. 04CASA has initiated a targeted safety campaign on hypoxia risk in GA operations above 10,000 ft.