Airflow Characteristics in Aeromedical Aircraft: Considerations During COVID-19.

Air Med J · 2021 · PMC7605759 · PMID 33455627

Europe PMC DOI

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a clear trendno p-value reported

By the third smoke test, completed 6 minutes after engine start-up, a clear trend of airflow toward the cockpit was observed.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.