# Pneumatic system

- Type: NTSB finding section
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › Pneumatic system
- NTSB code: 010236
- Cases: 5
- In the probable cause: 5
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/010236/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/010236/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/010236

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

- 2012: 1 / 1
- 2014: 1 / 1
- 2017: 1 / 1
- 2018: 1 / 1
- 2022: 1 / 1

## Findings

- [Pneumatic distribution system](https://openairdocs.org/ntsb-findings/01023610): 4 cases, 4 in the probable cause
- [Pneumatic indicating system](https://openairdocs.org/ntsb-findings/01023620): 1 cases, 1 in the probable cause

## Defining events in these cases

- [Runway excursion](https://openairdocs.org/ntsb-events/300): 2 cases
- [Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342): 1 cases
- [Loss of control on ground](https://openairdocs.org/ntsb-events/230): 1 cases
- [Landing gear collapse](https://openairdocs.org/ntsb-events/094): 1 cases

## Aircraft models (registry)

- [Yakovlev YAK 52](https://openairdocs.org/model/yakovlev-yak-52): 1 cases
- [Beech 58TC](https://openairdocs.org/model/beech-58tc): 1 cases
- [SC Aerostar YAK-52W](https://openairdocs.org/model/sc-aerostar-yak-52w): 1 cases

## Other findings in the same cases

- [Fence/fence post](https://openairdocs.org/ntsb-findings/03022047) (Environmental issues): 2 cases
- [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 2 cases
- [Sloped/uneven terrain](https://openairdocs.org/ntsb-findings/03021017) (Environmental issues): 1 cases
- [Rough terrain](https://openairdocs.org/ntsb-findings/03021015) (Environmental issues): 1 cases
- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases
- [Scheduled/routine maintenance](https://openairdocs.org/ntsb-findings/02062010) (Personnel issues): 1 cases
- [Preflight inspection](https://openairdocs.org/ntsb-findings/02061510) (Personnel issues): 1 cases
- [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 1 cases
- [Identification/recognition](https://openairdocs.org/ntsb-findings/02041510) (Personnel issues): 1 cases
- [Forgotten action/omission](https://openairdocs.org/ntsb-findings/02041035) (Personnel issues): 1 cases

## Newest cases

- [NTSB ERA22LA148](https://openairdocs.org/ntsb/ERA22LA148), Mar 7, 2022: Cessna 525 (N22AU), Middle River, MD, substantial damage. Probable cause: And undetermined failure of the brake system. Contributing to the accident was the failure of the pilots to locate and operate the emergency brake control, which resulted in a runway excursion and…
- [NTSB GAA18CA407](https://openairdocs.org/ntsb/GAA18CA407), Jul 1, 2018: Beech 58 (N66568), Mackinac Island, MI, substantial damage. Probable cause: The pilot’s failure to remove the pitot tube cover during the preflight inspection, which resulted in his delayed decision to reject the takeoff with insufficient runway remaining to safely stop the…
- [NTSB WPR17LA214](https://openairdocs.org/ntsb/WPR17LA214), Sep 23, 2017: SC Aerostar YAK 52W (N52KF), El Cajon, CA, substantial damage. Probable cause: The pilot's failure to maintain directional control during taxi after a reduction in braking performance and steering capabilities due to his failure to reopen the air supply valve after the…
- [NTSB WPR14LA251](https://openairdocs.org/ntsb/WPR14LA251), Jun 17, 2014: Airbus AS 350 BA FX1 (N6094H), Wailuku, HI, substantial damage. Probable cause: The failure of the engine’s pneumatic fuel control line fitting, resulting in a loss of engine power. Contributing to the failure was the repeated loosening and re-torqueing of the fitting during…
- [NTSB CEN12LA374](https://openairdocs.org/ntsb/CEN12LA374), Jun 14, 2012: Yakovlev Yak-52 (N76YK), Loveland, CO, substantial damage. Probable cause: The pilot’s inadvertent closure of the pneumatic system valve, which resulted in the nose landing gear not fully extending before landing. Contributing to the accident was the pilot's reliance on 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.

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