Sydney: A Qantas flight from New Zealand to Sydney landed safely on Wednesday after sending a Mayday call. Sydney Airport receives Qantas Flight 144 from Auckland, New Zealand.

Its engine reportedly failed, according to several sources. Two engines power the Boeing 737 aircraft. According to New South Wales Ambulance, the Mayday alert was being responded to.

According to Airservices Australia, a mayday call is made when a flight is in serious and immediate danger and requires immediate assistance.

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The airline said the mayday call was later downgraded. "Qantas Flight 144, a 737 flying from Auckland to Sydney, experienced a problem with one of its engines approximately one hour from its destination," Qantas said in a statement.

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It was originally declared a May Day, but has since been changed to PAN (Possible Assistance Needed). According to Qantas, engineers will now inspect the aircraft. There were no dangerous goods on board.

What does mayday calls mean?

According to Airservices Australia, the government-owned body in charge of managing Australia's skies, a Mayday call indicates "an aircraft is in serious and imminent danger and requires immediate assistance."

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The local emergency services will then be notified of the incident by the controllers. While less urgent, urgent aid or PAN calls still require controller response and pilot assistance. A medical emergency or malfunctioning equipment are two examples of PAN scenarios.