# Reservoir, 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) › Reservoir, main
- NTSB code: 01022916
- Cases: 3
- In the probable cause: 3
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01022916/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022916/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01022916

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

- 2008: 1 / 1
- 2019: 1 / 1
- 2020: 1 / 1

## Defining events in these cases

- [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 2 cases
- [Loss of control on ground](https://openairdocs.org/ntsb-events/230): 1 cases

## Aircraft models (registry)

- [Piper PA 46-350P](https://openairdocs.org/model/piper-pa-46-350p): 1 cases
- [Hill Taylor K LANCAIR 320](https://openairdocs.org/model/hill-taylor-k-lancair-320): 1 cases

## Other findings in the same cases

- [Runway/land/takeoff/taxi surface, general](https://openairdocs.org/ntsb-findings/03023000) (Environmental issues): 1 cases
- [Use of checklist](https://openairdocs.org/ntsb-findings/02063030) (Personnel issues): 1 cases
- [Scheduled/routine maintenance](https://openairdocs.org/ntsb-findings/02062010) (Personnel issues): 1 cases
- [Hydraulic fluid](https://openairdocs.org/ntsb-findings/01071015) (Aircraft): 1 cases
- [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 1 cases
- [Gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230) (Aircraft): 1 cases
- [Landing gear system, general](https://openairdocs.org/ntsb-findings/01023200) (Aircraft): 1 cases

## Newest cases

- [NTSB WPR20LA104](https://openairdocs.org/ntsb/WPR20LA104), Feb 28, 2020: Piper PA46 (N304LA), San Jose, CA, substantial damage. Probable cause: The failure to properly service the hydraulic power pack prevented a normal landing gear extension. Contributing to the accident was the failure of the landing gear emergency release valve to…
- [NTSB CEN19TA333](https://openairdocs.org/ntsb/CEN19TA333), Sep 25, 2019: Lancair Lancair 320 (N52WL), Bolivar, MO, substantial damage. Probable cause: Inadequate maintenance of the airplane, which resulted in a lack of adequate hydraulic fluid, malfunction of the landing gear extension system, and the landing gear collapse on landing.
- [NTSB MIA08LA086](https://openairdocs.org/ntsb/MIA08LA086), Apr 4, 2008: Cessna 750 (N750WM), New York, NY, substantial damage. Probable cause: The co-pilot's failure to maintain directional control during the landing roll. Contributing to the accident was a loss of system A hydraulic fluid for undetermined reasons and the flight crew's…

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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