e38 wrote:It is possible that it could have been a pressurization issue.
At one point in my career I flew an aircraft that was equipped with two air conditioning packs (for pressurization).
It was permissible to dispatch the aircraft with one pack inoperative (MEL) but there were certain restrictions that were required to be followed, one of which the maximum altitude allowed with an inoperative pack was Flight Level 250. It could fly revenue trips for three days before the condition HAD to be repaired.
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