According to two aviation experts, the likely source of the burning smell is the APU (auxiliary power unit), located in the aircraft's tail cone. This small turbine engine powers the aircraft's electrical systems and provides air for air conditioning while on the ground. The APU runs when the main engines are off, helping keep passengers comfortable during boarding, but it can produce a burning odor during startup that might concern travelers.
Scott Welch, a remote site aircraft mechanic, explains that the smell can be attributed to the air discharged from the APU’s compressor. He notes, 'The initial start-up of the APU often has a lingering burnt petroleum smell.' According to him, the superheated air passing through the aircraft's air system tends to be the main reason passengers might notice an unpleasant odor.
Maaz highlights that although both experts confirm the odor isn't jet fuel, there might be minute amounts of spent fuel mixing with outside air, depending on the conditions around the plane. He adds, 'As the primary engine ignites, it brings in air from the environment, while the APU continues to supply conditioned air to passengers, which can lead to some exhaust smell making its way into the cabin.'
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