# Oxygen system, general

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Oxygen system](https://openairdocs.org/ntsb-findings/010235) › Oxygen system, general
- NTSB code: 01023500
- Cases: 4
- In the probable cause: 3
- Fatal cases: 4
- All cases: https://openairdocs.org/ntsb-findings/01023500/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01023500/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01023500

## Cases per year (in the probable cause / all)

- 2009: 1 / 1
- 2015: 1 / 1
- 2021: 0 / 1
- 2023: 1 / 1

## Defining events in these cases

- [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 1 cases
- [Medical event](https://openairdocs.org/ntsb-events/850): 1 cases
- [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 1 cases
- [Unknown or undetermined](https://openairdocs.org/ntsb-events/000): 1 cases

## Aircraft models (registry)

- [Mooney M20TN](https://openairdocs.org/model/mooney-m20tn): 1 cases
- [Cirrus Design SR22](https://openairdocs.org/model/cirrus-design-sr22): 1 cases
- [Cessna 560](https://openairdocs.org/model/cessna-560): 1 cases
- [Beech B36TC](https://openairdocs.org/model/beech-b36tc): 1 cases

## Other findings in the same cases

- [Hypoxia/anoxia](https://openairdocs.org/ntsb-findings/02012035) (Personnel issues): 3 cases
- [Scheduled/routine maintenance](https://openairdocs.org/ntsb-findings/02062010) (Personnel issues): 1 cases
- [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 1 cases
- [Impairment/incapacitation, general](https://openairdocs.org/ntsb-findings/02012000) (Personnel issues): 1 cases
- [Fuel](https://openairdocs.org/ntsb-findings/01071010) (Aircraft): 1 cases
- [Fuel selector/shutoff valve](https://openairdocs.org/ntsb-findings/01022823) (Aircraft): 1 cases

## Newest cases

- [NTSB ERA23FA256](https://openairdocs.org/ntsb/ERA23FA256), Jun 4, 2023: Cessna 560 (N611VG), Montebello, VA, destroyed, 4 fatal. Probable cause: Pilot incapacitation due to loss of cabin pressure for undetermined reasons. Contributing to the accident was the pilot’s and owner/operator’s decision to operate the airplane without supplemental…
- [NTSB CEN22FA021](https://openairdocs.org/ntsb/CEN22FA021), Oct 27, 2021: Beech B36TC (N75RM), Lena, WI, substantial damage, 1 fatal. Probable cause: Impairment and subsequent incapacitation of the pilot for reasons that could not be determined. The incapacitation resulted in a loss of engine power due to fuel starvation. Likely contributing was…
- [NTSB ERA15LA349](https://openairdocs.org/ntsb/ERA15LA349), Sep 10, 2015: Mooney M20TN (N370MM), Atlantic City (Atlantic Ocean), substantial damage, 1 fatal. Probable cause: A loose oxygen line, which was not detected by maintenance personnel during a recent annual inspection, that allowed oxygen to escape and drain the oxygen canister more quickly than the pilot…
- [NTSB ERA09FA429](https://openairdocs.org/ntsb/ERA09FA429), Jul 31, 2009: Cirrus SR-22 (N581DS), Ravenswood, WV, destroyed, 1 fatal. Probable cause: The pilot's improper modification of the certified, on-board oxygen system, which resulted in incapacitation due to hypoxia, and the airplane's subsequent uncontrolled descent into terrain.

NTSB has coded findings and defining events since 2008; earlier cases used its older occurrence and cause codes and aren't counted.

Findings: https://openairdocs.org/ntsb-findings.md. Defining events: https://openairdocs.org/ntsb-events.md. Phases of flight: https://openairdocs.org/ntsb-phases.md. Every investigation, filtered by finding, event, phase, state, year or model: https://openairdocs.org/ntsb.md (for example ?state=MI&fatal=1).

NTSB's definitions: Accident and incident, 49 CFR 830.2 (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-VIII/part-830/subpart-A/section-830.2), CICTT occurrence categories (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/OccurrenceCategoryDefinitions.pdf), CICTT phases of flight (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/PhaseofFlightDefinitions.pdf), and NTSB coding manual, before 2008 (PDF) (https://www.ntsb.gov/GILS/Documents/codman.pdf). NTSB publishes no definitions for its findings, only their names.

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