Flight crew reported Engine Pneumatic and Aircraft Bleed Air Systems malfunctions caused a loss of Cabin Pressure and Wing Anti Ice Protection. The flight crew descended and a diversion was made.
Synopsis
Flight crew reported Engine Pneumatic and Aircraft Bleed Air Systems malfunctions caused a loss of Cabin Pressure and Wing Anti Ice Protection. The flight crew descended and a diversion was made.
Narrative
I was flying Aircraft X; Date turn from ZZZ1 to ZZZ and back. On the leg into ZZZ; we had to descend through a layer of icing conditions which caused us to turn on our engine anti icing systems. Five minutes after we turned on the engine anti ice; we received a Right Engine Bleed OFF and associated Right Pack OFF EICAS (Engine Indicating and Crew Alerting System) messages. We were able to use the isolation valve to transfer the bleed air from the left engine to the right and this was sufficient enough to get us through the layer of icing.No further issues were encountered landing in ZZZ. Upon landing; the right engine bleed off EICAS message was addressed by company maintenance. While on the ground; the fueling and loading procedures were witnessed by FAA investigators. The FAA investigators also inspected the aircraft maintenance log and took note of many right pack off EICAS message write ups. Company maintenance signed off the right engine bleed off EICAS message and cleared the aircraft for flight.After departing ZZZ for the return flight; while climbing through FL 250; we once again encountered icing conditions that required us to turn on the engine anti ice system. Five minutes after we turned on the engine anti ice; we received a Right Engine Bleed OFF and associated Right Pack OFF EICAS messages. We were able to use the isolation valve to transfer the bleed air from the left engine to the right and this was sufficient enough to get us through the layer of icing. After exiting icing conditions; the isolation valve and the engine anti ice system were turned off. In cruise; icing conditions were once again encountered while over the ZZZ2 VOR. The isolation valve was opened and the engine anti ice was turned on. Three minutes after the engine anti ice was turned on; we received a Left Engine Bleed OFF and Left Pack OFF EICAS message. With neither of the two bleed systems available; a slow depressurization of the cabin commenced. Upon receiving the EICAS messages; all crew members donned oxygen masks and a request to descend was issued to ATC. Initially we were cleared down to FL 240 for traffic. During this descent; the cabin pressure altitude reached an altitude of 15;000 feet prompting the Cabin Altitude Warning Message and the Red Cabin ALT Light to illuminate. At this point; the priority handling was requested so that we could continue descent to 10;000 feet. During this descent; the Main Cargo Door Caution Message illuminated.During the descent; the Captain flew the aircraft and handled the radios. The First Officer was running the emergency checklists. I the relief pilot was checking the weather and NOTAMS at nearby airports as well as looking at potential instrument approaches.Upon reaching 10;000 feet; the crew took off the oxygen masks; and decided to divert to ZZZ2. When that decision was made; the EICAS messages that were showing were; in order: CABIN ALTITUDE Warning; MAIN CARGO DOOR Caution; L ENG BLEED OFF Status; L PACK OFF Status; R ENG BLEED OFF Status; and R PACK OFF Status.After landing; the company intended to clear the messages and then dispatch the flight to ZZZ1 in icing conditions over mountainous terrain; at night. After the crew timed out per FAR 121; the crew was sent to a hotel for rest. The required rest was achieved at this hotel and the flight left for ZZZ1 the next afternoon.Per the company MEL; the L/R ENG BLEED OFF advisory messages are listed for MEL XX-XX-XX. The continuation of the flight was dispatched under MEL XX-XX-XY which is for the L/R ENG BLEED VAL caution message. The First Officer and I addressed our concerns with the Captain and our onboard Maintenance person; who signed off the aircraft. We were assured that the MELs had been properly complied with and the aircraft was legal to fly.The rest of the flight to ZZZ1 was uneventful and icing conditions were not encountered.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.