# Hydraulic, indicating system

- 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) › Hydraulic, indicating system
- NTSB code: 01022930
- Cases: 2
- In the probable cause: 2
- Fatal cases: 1
- All cases: https://openairdocs.org/ntsb-findings/01022930/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022930/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01022930

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

- 2008: 1 / 1
- 2015: 1 / 1

## Defining events in these cases

- [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 1 cases
- [Ground collision](https://openairdocs.org/ntsb-events/200): 1 cases

## Aircraft models (registry)

- [American Eurocopter AS350B3](https://openairdocs.org/model/american-eurocopter-as350b3): 1 cases

## Other findings in the same cases

- [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 2 cases
- [Hydraulic power system, general](https://openairdocs.org/ntsb-findings/01022900) (Aircraft): 2 cases
- [Design of document/info](https://openairdocs.org/ntsb-findings/04011020) (Organizational issues): 1 cases
- [Equipment design](https://openairdocs.org/ntsb-findings/04011010) (Organizational issues): 1 cases
- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases
- [Use of policy/procedure](https://openairdocs.org/ntsb-findings/02063032) (Personnel issues): 1 cases
- [Use of checklist](https://openairdocs.org/ntsb-findings/02063030) (Personnel issues): 1 cases
- [Forgotten action/omission](https://openairdocs.org/ntsb-findings/02041035) (Personnel issues): 1 cases
- [Lack of action](https://openairdocs.org/ntsb-findings/02041030) (Personnel issues): 1 cases
- [Hydraulic, auxiliary system](https://openairdocs.org/ntsb-findings/01022920) (Aircraft): 1 cases

## Newest cases

- [NTSB CEN15MA290](https://openairdocs.org/ntsb/CEN15MA290), Jul 3, 2015: Airbus Helicopters AS350B3E (N390LG), Frisco, CO, destroyed, 1 fatal. Probable cause: Airbus Helicopters' dual-hydraulic AS350 B3e helicopter's (1) preflight hydraulic check, which depleted hydraulic pressure in the tail rotor hydraulic circuit, and (2) lack of salient alerting to the…
- [NTSB NYC08LA091](https://openairdocs.org/ntsb/NYC08LA091), Feb 1, 2008: North American Rockwell NA-265-80 (N3RP), Ft. Lauderdale, FL, substantial damage. Probable cause: The depletion of pressure in the normal hydraulic system for an undetermined reason, and the pilots' failure to properly operate the emergency braking system. Contributing to the accident was an…

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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