CA.VIII.A.K3cFAA-S-ACS-7B · Nov 2023Knowledge
c. Precautions when using supplemental oxygen systems
Operational factors, including: c. Precautions when using supplemental oxygen systems
Bottom line
Pilots should be aware of the increased danger of fire when using oxygen. Oils and greases may ignite if exposed to oxygen and cannot be used for sealing the valves and fittings of oxygen equipment. Before each flight, the pilot should thoroughly inspect and test all oxygen equipment.
Key numbers
| Number | What it means |
|---|---|
| increased danger of fire when using oxygen | Fire risk |
| prohibited during any oxygen use | Smoking |
| safe up to 40,000 ft MSL | Demand mask |
| 1,800–2,200 psi | Cylinder pressure |
FAA references
- AC 61-107, para. 2-9 — AC No: 61-107B
- PHAK ch. 7 (p. 7-37) — FAA-H-8083-25C (2023)
- PHAK ch. 7 (p. 7-39) — FAA-H-8083-25C (2023)
- 14 CFR 91.211 (Supplemental oxygen.) — eCFR current as of 2026-03-05
- AIM 8-1-2 (Effects of Altitude) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- AC 61-107, para. 2-12 — AC No: 61-107B
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