The pilot noticed the cabin door warning light flickering, which then became steadily illuminated, coinciding with a bang that indicated the cabin door had opened.
CCTV footage confirmed the external door handle was in the closed position before takeoff, emphasizing the importance of thorough pre-flight checks.
The Beechcraft King Air 90 series has only recorded two similar incidents, highlighting the rarity yet seriousness of cabin door failures during flight.
The pilot declared a "PAN" emergency as a precautionary measure and successfully returned to London Biggin Hill Airport for a safe landing.
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