# Shimmy damper

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Landing gear system](https://openairdocs.org/ntsb-findings/010232) › Shimmy damper
- NTSB code: 01023252
- Cases: 3
- In the probable cause: 3
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01023252/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01023252/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01023252

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

- 2012: 1 / 1
- 2021: 1 / 1
- 2022: 1 / 1

## Defining events in these cases

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

- [North American T-28B](https://openairdocs.org/model/north-american-t-28b): 1 cases
- [Leder John A LEDER VELOCITY XL RG](https://openairdocs.org/model/leder-john-a-leder-velocity-xl-rg): 1 cases

## Other findings in the same cases

- [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 1 cases
- [Installation](https://openairdocs.org/ntsb-findings/02062035) (Personnel issues): 1 cases
- [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 1 cases
- [Nose/tail gear strut/axle](https://openairdocs.org/ntsb-findings/01023222) (Aircraft): 1 cases

## Newest cases

- [NTSB DCA22FA132](https://openairdocs.org/ntsb/DCA22FA132), Jun 21, 2022: Mcdonnell Douglas MD80 (HI-1064), Miami, FL, substantial damage. Probable cause: The structural failure of the left main landing gear downlock following ineffective shimmy dampening during the landing roll which caused the collapse of the left main landing gear, resulting in a…
- [NTSB WPR21LA318](https://openairdocs.org/ntsb/WPR21LA318), Aug 12, 2021: North American T-28B (N392W), Puyallup, WA, substantial damage. Probable cause: A nose wheel shimmy during the landing roll for reasons that could not be determined from the available evidence, which led to a loss of directional control.
- [NTSB ERA12LA431](https://openairdocs.org/ntsb/ERA12LA431), Jul 2, 2012: Leder John A Leder Velocity XL RG (N224SM), Thomson, GA, substantial damage. Probable cause: Separation of the nose landing gear due to a preexisting fatigue crack caused by an earlier shimmy event and the subsequent incorrect installation of the shimmy dampener.

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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