PA.IX.C.K4FAA-S-ACS-6C · Nov 2023Knowledge
Any other system specific to the aircraft (e.g., supplemental oxygen, deicing).
Any other system specific to the aircraft (e.g., supplemental oxygen, deicing).
Bottom line
The presence of anti-icing and deicing equipment, even though it may appear elaborate and complete, does not necessarily mean that the airplane is approved for flight in icing conditions. Crew and passengers use oxygen systems, in conjunction with pressurization systems, to prevent hypoxia.
Key numbers
| Number | What it means |
|---|---|
| after 30 minutes exposure to cabin pressure altitudes between 12,500 and 14,000 feet | Crew O2 (12,500–14,000) |
| immediately upon exposure to cabin pressure altitudes above 14,000 feet | Crew O2 (above 14,000) |
| every aircraft occupant above 15,000 feet cabin pressure altitude | All occupants (above 15,000) |
| above 10,000 feet cabin altitude during the day and above 5,000 feet at night | Recommended O2 |
| 1,800 to 2,200 psi | O2 storage pressure |
FAA references
- AFH ch. 13 (pp. 13-8–13-9) — FAA-H-8083-3C
- PHAK ch. 7 (p. 7-37) — FAA-H-8083-25C (2023)
- PHAK ch. 7 (p. 7-39) — FAA-H-8083-25C (2023)
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