Qantas Airways has inspected dozens of its aircraft and notified some overseas carriers after it was discovered Qantas engineers at Melbourne airport mistakenly pumped nitrogen into the emergency oxygen tanks of one of Qantas’ Boeing 747s.

A spokeswoman in Canberra for the Australia’s Civil Aviation Safety Authority (CASA) says Qantas engineers had mistaken a nitrogen cart for an oxygen cart and used the nitrogen cart to pump nitrogen into the 747’s emergency oxygen tanks.

Nitrogen is used to fill aircraft tyres and if inhaled nitrogen can cause a person to quickly black out.

The CASA spokeswoman says fortunately one of Qantas’ other engineering personnel noticed the mistake before the <A href=”http://www.flightgl

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