# Pneumatic distribution system

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Pneumatic system](https://openairdocs.org/ntsb-findings/010236) › Pneumatic distribution system
- NTSB code: 01023610
- Cases: 4
- In the probable cause: 4
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01023610/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01023610/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01023610

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

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

## Defining events in these cases

- [Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342): 1 cases
- [Runway excursion](https://openairdocs.org/ntsb-events/300): 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
- [SC Aerostar YAK-52W](https://openairdocs.org/model/sc-aerostar-yak-52w): 1 cases

## Other findings in the same cases

- [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 2 cases
- [Fence/fence post](https://openairdocs.org/ntsb-findings/03022047) (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
- [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
- [Surface speed/braking](https://openairdocs.org/ntsb-findings/01062045) (Aircraft): 1 cases
- [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 1 cases
- [Gear position and warning](https://openairdocs.org/ntsb-findings/01023260) (Aircraft): 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 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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