On 20 February 2023, a Fokker 70 flight crew only realised the landing altitude for their destination, Port Moresby, had not been set late in the descent. With insufficient time to eliminate the cabin pressure differential automatically, an attempt to use the abnormal manual control procedure was made. When it became clear that this had not worked, a go-around was initiated but when the cabin pressure differential then rose rapidly to 6 psi, multiple passenger ear/nose/throat injuries resulted, some serious. Another abnormal procedure was then actioned and this fortuitously resolved the situation and the aircraft was able to land.