When an engineer was doing a routine technical examination of the empty aircraft (777) at the Delhi airport on Wednesday night, auto shutdown of the auxiliary power unit (APU) took place, the airline said. The APU is the smallest engine on an aircraft and situated at the tail of it. It provides the necessary power to start the main engines. Airport personnel observed black fumes from the APU exhaust and, believing it to be a fire hazard, sprayed APU and part of the fuselage with foam spray, the national carrier said.

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The APU was examined by opening its cowlings (cover). After opening the cover, "there was no traces of any burn or external damage noticed except for the minor oil leaks traces, which was normal," it said. A detailed inspection is going on, it added.

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