What is an Auxiliary Power Unit or APU that caught fire in Air India plane after landing at Delhi Airport?

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An Air India plane’s Auxiliary Power Unit (APU) caught fire after landing at the Delhi airport on Tuesday. As per an airline spokesperson, all passengers and crew members are safe. “Flight AI 315, operating from Hong Kong to Delhi on 22 July 2025, experienced an auxiliary power unit (APU) fire shortly after it had landed and parked at the gate,” he said. The incident occurred while passengers had begun disembarking, and the APU was automatically shut down as per system design, the spokesperson added.