# Air distribution system

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Air conditioning system](https://openairdocs.org/ntsb-findings/010221) › Air distribution system
- NTSB code: 01022120
- Cases: 2
- In the probable cause: 2
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01022120/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022120/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01022120

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

- 2016: 2 / 2

## Defining events in these cases

- [Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333): 1 cases
- [Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331): 1 cases

## Aircraft models (registry)

- [Cessna 501](https://openairdocs.org/model/cessna-501): 1 cases
- [Beech 58](https://openairdocs.org/model/beech-58): 1 cases

## Other findings in the same cases

- [Incorrect action selection](https://openairdocs.org/ntsb-findings/02041010) (Personnel issues): 1 cases
- [Other loss of consciousness](https://openairdocs.org/ntsb-findings/02012055) (Personnel issues): 1 cases
- [Dynamic load](https://openairdocs.org/ntsb-findings/01062032) (Aircraft): 1 cases
- [Altitude](https://openairdocs.org/ntsb-findings/01062012) (Aircraft): 1 cases
- [Crew oxygen system](https://openairdocs.org/ntsb-findings/01023510) (Aircraft): 1 cases
- [Elevator control system](https://openairdocs.org/ntsb-findings/01022730) (Aircraft): 1 cases

## Newest cases

- [NTSB CEN16CA359](https://openairdocs.org/ntsb/CEN16CA359), Aug 26, 2016: Beech 58 (N15MD), Wichita Falls, TX, substantial damage. Probable cause: The incorrect maintenance of the airplane's ventilation system which resulted in an obstruction of the elevator control system.
- [NTSB CEN16LA197](https://openairdocs.org/ntsb/CEN16LA197), May 24, 2016: Cessna 501 (N804ST), Texarkana, AR, substantial damage. Probable cause: The pilot's failure to use supplemental oxygen as required during high-altitude flight, which resulted in his loss of consciousness following a loss of cabin pressurization. Contributing to the…

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.