AA.I.E.K6FAA-S-ACS-11A · Nov 2023Knowledge
Causes and recognition of cabin pressure loss.
Causes and recognition of cabin pressure loss.
Bottom line
Air carrier training on aircraft decompression covers the causes and recognition of cabin pressure loss. Except as provided in paragraph (c) of 14 CFR 25.841, pressurized cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 8,000 feet under normal operating conditions. Fuselage structure, engine and system failures are to be considered in evaluating the cabin decompression.
Key numbers
| Number | What it means |
|---|---|
| Not more than 8,000 feet cabin pressure altitude under normal operating conditions | Normal cabin |
| 10,000 feet cabin pressure altitude | Cabin alert |
FAA references
- AC 61-138, para. 14.3 — AC No: 61-138A
- 14 CFR 25.841 (Pressurized cabins.) — eCFR current as of 2026-10-08
- 14 CFR 121.333 (Supplemental oxygen for emergency descent and for first aid; turbine engine powered airplanes with pressurized cabins.) — eCFR current as of 2026-10-01
- 14 CFR 121.703 (Service difficulty reports.) — eCFR current as of 2026-10-01
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