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State news agency RIA-Novosti said the cause was failure of the pressurization system of the oxidizer tank of the central block of the rocket.

The safety check was scheduled to look at the pressurization warning lights as well as a stiff handle on a passenger door.

She cautioned, however, that the pressurization light might be unrelated to the door plug blowout.

Turgut referred to three incidents in which warning lights indicating a reduction in cabin pressurization went off on the MAX 9 that saw its door plug fail.

The MAX cabin pressurization is a triple redundant system, with primary and secondary computer controllers backed up by a manual option for the pilots.