At issue is rapid degradation of fuselage surfaces
Qatar Airways said on Thursday that it had been ordered by regulators in the Gulf state to ground 13 of its Airbus A350 aircraft over the rapid degradation of fuselage surfaces.
The airline, one of the Gulf "big three" carriers, previously stopped accepting delivery of the aircraft over the issue, according to media reports in June.
Qatar Airways said in a statement that it had been forced to press out-of-service Airbus A330 aircraft back into operation to fill the gap left by the grounding of the 13 aircraft.
Qatar Airways has 34 A350-900 types and 19 A350-1000s in its fleet, according to an Airbus document.
"The airline is working with its regulator to ensure the continued safety of all passengers ... and following the explicit written instruction of (the airline's) regulator, thirteen aircraft have now been grounded," the airline said.
Qatar Airways is regulated by the Qatar Civil Aviation Authority.
The airline's chief executive Akbar al-Baker said he expects "Airbus treats this matter with the proper attention that it requires."
"Qatar Airways will not accept anything other than aircraft that continue to offer its customers the highest possible standard of safety and the best travel experience that they deserve," he said in the statement.
"Qatar Airways expects Airbus to have established the root cause and permanently corrected the underlying condition to the satisfaction of Qatar Airways and our regulator before we take delivery of any further A350 aircraft."