# Pressure relief, main

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Hydraulic power system](https://openairdocs.org/ntsb-findings/010229) › Pressure relief, main
- NTSB code: 01022915
- Cases: 1
- In the probable cause: 0
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01022915/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022915/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01022915

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

- 2010: 0 / 1

## Defining events in these cases

- [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 1 cases

## Aircraft models (registry)

- [Cessna 210L](https://openairdocs.org/model/cessna-210l): 1 cases

## Other findings in the same cases

- [Scheduled/routine maintenance](https://openairdocs.org/ntsb-findings/02062010) (Personnel issues): 1 cases
- [Hoses and tubes](https://openairdocs.org/ntsb-findings/01071410) (Aircraft): 1 cases
- [Hydraulic fluid](https://openairdocs.org/ntsb-findings/01071015) (Aircraft): 1 cases
- [Main landing gear](https://openairdocs.org/ntsb-findings/01023210) (Aircraft): 1 cases

## Newest cases

- [NTSB CEN10LA389](https://openairdocs.org/ntsb/CEN10LA389), Jul 9, 2010: Cessna 210 (N2157S), Houston, TX, substantial damage. Probable cause: The failure of a hydraulic fluid line, which caused a loss of hydraulic pressure to the landing gear extension system and resulted in the partial collapse of the right main landing gear during…

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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