# Hazardous material leak/spill

- Type: NTSB defining event
- NTSB code: 450
- CICTT category: Other
- Defining event in: 1 cases
- In the sequence of: 12 cases
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-events/450/cases.md
- Cases with it anywhere in the sequence: https://openairdocs.org/ntsb-events/450/sequence.md
- Page: https://openairdocs.org/ntsb-events/450

## Cases per year (defining / in the sequence)

- 2008: 0 / 1
- 2010: 0 / 2
- 2012: 0 / 3
- 2014: 0 / 1
- 2018: 0 / 2
- 2021: 1 / 1
- 2022: 0 / 1
- 2023: 0 / 1

## Phase of flight

- Maneuvering-low-alt flying: 1 cases

## In the probable cause of these cases

- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases
- [Visual function](https://openairdocs.org/ntsb-findings/02011510) (Personnel issues): 1 cases
- [Fluids, general](https://openairdocs.org/ntsb-findings/01071000) (Aircraft): 1 cases
- [Altitude](https://openairdocs.org/ntsb-findings/01062012) (Aircraft): 1 cases

## Aircraft models (registry)

- [Ayres S2R-T34](https://openairdocs.org/model/ayres-s2r-t34): 1 cases

## Newest cases

- [NTSB CEN21LA286](https://openairdocs.org/ntsb/CEN21LA286), Jun 21, 2021: Ayres S2R-T34 (N4328P), Leoti, KS, substantial damage. Probable cause: The pilot’s loss of visibility in the cockpit due to foam created by the chemicals loaded in the hopper, which resulted in his inability to maintain airplane control during low-level flight and 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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