Air carrier Relief First Officers reported a pressurization failure during initial cruise flight at night. The flight returned to the departure airport and landed safely.
Synopsis
Air carrier Relief First Officers reported a pressurization failure during initial cruise flight at night. The flight returned to the departure airport and landed safely.
Narrative
After the initial climb to Flight Level 400 and level; I went to the rest area in specific to the left bunk. A few minutes later I heard a noise from the left side of the airplane and immediately I proceeded to the flight deck; after reaching the flight deck and seat in the second observer seat; I saw the EICAS message CABIN ALTITUDE followed by 2 more additional EICAS messages; Immediately I Don the oxygen mask and Establish crew communication. I that moment I joined the PF; PM and the third seater with the task on the QRC CABIN ALTITUDE and QRH CABIN ALTITUDE Checklist. The PF [notified ATC] the requirement to descend due to the nature of the situation and checklist procedures; The PF initiated the descend in to the lower altitude according to the QRC and QRH. After reaching 10;000ft and finishing the checklists and checking everyone onboard is safe; The PM contact Dispatch to notify the Aircraft Status and Position. After the three way communication was establish and being able to confirm with Dispatch and Maintenance the aircraft status the decision was to return to ZZZ. At that point the PF advised ATC the decision to return back to ZZZ. Without any further delay ATC provided the new clearance and route to the new destination ZZZ. Current aircraft weight and Flight Deck Performance no fuel dump was required and no overweight landing.
Second reporter narrative
During climb out of ZZZ en route to ZZZ1; at approximately FL400 over Location A; the flight experienced a loss of cabin pressurization. Cabin altitude exceeded 16;000 ft; triggering a RED CAB ALT EICAS message and full oxygen mask deployment. The crew executed a descent to FL100 and eventually returned safely to ZZZ; landing on RWY XXR.Cause: Description of Contributing Factors:•Mechanical failure of the pressurization system due to a stuck valve and leaking cargo door seals.•Challenges in crew coordination and situational clarity during the event; including:oDelayed initiation of immediate action items.oLack of clear CRM leadership and procedural discipline in handling the NNC (Non-Normal Checklist).oSATCOM communication was inefficient and prolonged.oUncertainty on whether [priority handling should have been requested].•CVR data was compromised due to the event record button not being pressed and the C/B (Circuit Breaker) not pulled.•Post-incident rest and scheduling did not reflect the nature of the event.3. Actions Taken During the Event:•Donned oxygen mask promptly and assisted in ensuring all flight deck and supernumerary personnel were protected.•Prompted immediate action item initiation and assisted in QRH/Checklist procedures.•Helped coordinate communications with ATC and the company via SATCOM.•Monitored aircraft systems and situation to support flight crew situational awareness.•Suggested altitude adjustments to optimize safety and cabin conditions.Suggestions: 4. Lessons Learned:•Assertive communication and leadership are critical in high-stress; high-altitude events.•When in doubt; [requesting priority handling] should be the default if lives or aircraft integrity may be at risk. It can always be downgraded.•Post-incident support (rest; debriefing; check-ins) is essential for safety and crew wellbeing.•Clear documentation and checklist discipline avoid ambiguity and allow for more effective CRM.Recommendations:1.Enhance CRM and emergency training to focus on leadership under pressure; especially in multi-national crews.2.Review and revise SATCOM protocols to ensure clarity and prioritization of critical information.3.Ensure all crew are regularly trained on NNC (Non-normal checklist) discipline and communication flow during abnormal operations.4.Improve post-incident support systems; including debriefings; wellness checks; and flexible scheduling.5.Reinforce the importance of immediate CVR preservation steps in all emergency or abnormal situations.6. Reporter's Final Notes:I commend the crew for the safe return of the aircraft under challenging circumstances. However; I believe a more structured approach to communication; leadership; and follow-through could have mitigated the stress and confusion experienced during the incident. I respectfully submit this report with the sole intention of contributing to a safer; more resilient operational environment for all Company Air crew.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.