2024-05 · NASA ASRS report 2124024
B737 flight crew reported aircraft MEL'd with one operational pressurization controller which failed resulted in a divert and an overweight landing.
About 45 to 50 minutes into the flight we were at cruising altitude of 34;400' when Auto Fail light illuminated. This was written signed off per MEL and aware we were flying with one Pressurization Controller. I was the Pilot Flying. I transferred controls and began running the QRC. A few minutes later; trying to control the cabin; per QRC; and setting up a diversion to ZZZ [airport]; as we were 90 miles NE of ZZZ. Suddenly; the ALT Warning Red Illumination light flashed. Both the Captain and I donned our masks and established Crew communication. The Captain notified ATC he was descending. I began running checklist; setting up the FMC and doing all I could to get set up for the ILS [runway] XXL and make the Captain's job easier as he was flying. I don't quite remember a lot of details when we started our descent; but ATC did [provide priority handling] for us. I ran all checklists. We did not drop Cabin masks; because there was still oxygen in the cabin. Crew F/As (Flight Attendants) all did a phenomenal job as the aircraft safely reached ZZZ.Suggestions: Not fly with only one Pressurization Controller .
At FL340 our aircraft started having pressurization problems. We ran the QRH Checklists and informed ATC that we needed a lower altitude. He then informed ATC that we needed to divert to ZZZ. ATC [provided priority handling] as we were descending. We landed overweight; made the required logbook entry; and informed our Maintenance department.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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