<h1>Aircraft APUs Fire After Landing Causes Damage, Triggers Aviation Regulator Investigation Under Safety Rules</h1> An aircraft operated by a national airline experienced a fire in its auxiliary power unit shortly after landing and parking at a major airport. The fire occurred during passenger disembarkation, but all passengers and crew were unharmed. The aircraft sustained some damage and has been grounded pending investigation. The aviation regulator has been notified and is conducting inquiries into the incident. This event follows two other recent technical issues involving the same airline's planes within a short time frame.