It happens. Ive told the story multiple times on this forum how this happened to me back in 86.
Problem with some valve, the plane would pressurize real high then suddenly depressurize. Over the course of about half the flight from Milwaukee to Memphis(?). I dont remember the aircraft jumping around elevation wise.
Caused all kinds of problems to my ears, the left one in particular is still half out a lot of times.
>Ive told the story multiple times on this forum how this happened to me back in 86.<
The most pressurization problems I’ve had were the mid 80’s right after smoking was banned on planes. The outflow valves that control pressurization were covered with a sticky tar residue. Airlines began cleaning the outflow valves and the result was a more rapid operation of the valve causing pressurization spikes.
It took years for redesign to do away with the problem.
Today’s pressurization systems are so highly computerized and redundant that the art of manual cabin pressure control is not even taught anymore. It is even more unlikely to be taught in Korea. Heck, they can’t even fly a visual approach, ala Asiana 214 in SFO.
There are over 100,000 flights per day globally. Over half of those flights are Boeing aircraft accounting for 68% of the hours flown. Make of that what you will.
EC