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CA.I.G.K1lFAA-S-ACS-7B · Nov 2023Knowledge

l. Oxygen system

ACS element text (the applicant demonstrates understanding of)

Airplane systems, including: l. Oxygen system

Bottom line

An oxygen system that delivers oxygen mixed or diluted with air in order to maintain a constant oxygen partial pressure as the altitude changes. Diluter-demand oxygen systems supply oxygen only when the user inhales through the mask.

Key numbers

Key numbers for l. Oxygen system
NumberWhat it means
Up to 40,000 feetMask limit
Above 34,000 feet cabin altitudePressure-demand
Above 18,000 feetMasks required

FAA references

  1. PHAK Glossary (p. G-10) — FAA-H-8083-25C (2023)
  2. PHAK ch. 7 (p. 7-38) — FAA-H-8083-25C (2023)
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