B767 flight crew reported a cabin pressurization system malfunction during climb. Flight crew diverted to a suitable airport.
Synopsis
B767 flight crew reported a cabin pressurization system malfunction during climb. Flight crew diverted to a suitable airport.
Narrative
During climbout from ZZZZ; one of the FAs (Flight Attendants) working in the aft of the aircraft called up. They reported that there was 'low airflow'/oxygen and wondered if we could adjust the packs to help them out. The flt crew replied that pressurization was normal; all bleed systems showed normal; and we would monitor to see if there was anything else we could do. The FAs said they would report back to us later in flight. After about an hour; and just prior to coasting out into Class II airspace and commencing ETOPS; they replied that multiple passengers had gotten up and asked for Oxygen because during the climb out there was an 'exhaust smell'; and even a few of the FAs were using oxygen because they felt nauseous; hazy mental conditions; legs feeling like jello; and sick in general. The Flt crew immediately called dispatch and requested a medical advisory service consult. After giving the medical advisory service all the information and that it affected crew and passengers; they recommended a divert. By this time we had coasted out and were in between ZZZZZ and ZZZZZ1. It was decided that the nearest suitable airport was ZZZZ1. The crew then set up for a divert into ZZZZ1. The Crew [advised ATC] on ZZZZ and completed all the procedures. ZZZZ cleared the flight direct to ZZZ [VOR] and the crew recovered into ZZZZ1 with an Overweight Landing. The landing was smooth at at 300 fpm VVI (Vertical Velocity Indicator); and overweight landing report; diversion report; multiple ELB (Electronic Log Book) reports; and a call to the Chief Pilot were made. The local airport authority controlled the situation and was hesitant to release passengers and crew into the local airport population because of fear of of biological/viral sickness. Eventually the local Operations Supervisor got the passengers off the aircraft.
Second reporter narrative
During the climbout of ZZZZ one of the FA (Flight Attendant) called from the back to inform us that multiple ppl were complaining about being light headed and nauseous including her. She asked us if there was a way for us to pump more O2 in the back. We checked to make sure that the aircraft was pressurizing and the cabin altitude at that time was around 2000 feet. She did tell us that they were going on supplemental O2 to mitigate the symptoms. We continued on for the time being and just as when we were coasting out around ZZZZZ WP; she called again to tell us that they were still feeling sick and that the symptoms for some of them were worsening. I had them wake up the Relief Pilot and had him walk back and check if everything was ok. He didn't smell or see any fumes but said that his throat got scratchy while he was in the back. We called dispatch and got a patch through to the medical advisory service where the physician on call advised us to divert. We [requested priority handling] with ZZZZ and were cleared direct to ZZZZ1. The diversion was uneventful resulting in a planned overweight landing. Entries were made in the ELB (Electronic Log Book). Chief Pilot was made aware of the situation and local authorities took over the scene. Two FAs were put on oxygen as their BP (Blood Pressure) was very high and the medics suspected carbon monoxide poisoning.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.