<h1>Airline A321 aircraft experiences auxiliary power unit fire after landing, all passengers and crew safely evacuated</h1> An airline's A321 aircraft experienced an auxiliary power unit fire after landing at Delhi airport from Hong Kong. The incident occurred while passengers were disembarking at the gate, with the APU automatically shutting down per system design. All passengers and crew members safely exited the aircraft normally. The fire caused some damage to the aircraft, which has been grounded for investigation. Aviation regulators have been notified of the incident. The flight landed at 12:12 pm on the scheduled date. The airline confirmed that safety protocols functioned as intended during the emergency situation.