2025-11 · NASA ASRS report 2308530
Boeing 757-200 flight crew reported a cabin pressurization anomaly which necessitated a descent to an altitude where cabin pressure could be maintained to the destination airport.
Flight was established in cruise at FL310 for approximately 4 minutes when the aural warning bell alarmed; the red Master Caution Light came on; and the red EICAS CABIN ALTITUDE warning came on. Crew members donned oxygen masks and established communications. We verified both PACKS were on. The cabin altitude gauge read 10;000 ft; well above the normal reading. The Capt who was the pilot flying coordinated an immediate descent with ATC while I pulled up the QRH checklist for CABIN ALTITUDE. The checklist was completed. The cabin altitude gauge stayed at 10;000 ft and wasn't going any higher. As we began our descent it began to slowly decrease. Because the cabin altitude was stable and decreasing we stopped our descent at FL180. The EICAS CABIN ALTITUDE warning went out when the cabin altitude gauge reached approximately 8500 ft.We were already close to our destination so elected to try and contact [Operations] via [alternative system] as opposed to ACARS. We tried connecting through two different stations (ZZZ1 and ZZZ) but received error messages. We were close enough to our destination gateway (ZZZ) to contact them via the ops radio frequency so we informed them off the situation and asked them to call Flight Ops. We verified we had enough fuel to continue to our destination at the lower altitude. As the cabin altitude stabilized at around 6K we removed our oxygen masks. We continued normally to ZZZ with no further issues.
At FL310 we received a Cabin Altitude EICAS warning message; Red Master Caution and aural warning. We donned our oxygen; established communication and confirmed both PACKS were on. I requested a descent to FL180 while the FO was working the checklist items. It was determined that the cabin was controllable and a further descent to 10;000 was not necessary. Once I made the decision that I was comfortable continuing to our destination I tried contacting my dispatcher on two separate [alternative communication system] stations. Both of which ending with the wording error after the dialing process tried to establish connection. I was then able to call ZZZ over the radio and had them relay our issue back to my dispatcher so that the company would be aware. The pressurization did stabilize and the remainder of our flight was uneventful.
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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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