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B757-200 captain reported loss of cabin pressure related to either pack or cabin altitude controller failure.
| Attributes | |
| ACN | 1588894 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Conditioning and Pressurization Pack |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Illness |
Narrative:
Had a MEL deferral for left engine N3 indication; and on climbout received numerous brief left engine bleed EICAS messages as the N3 indicator went to zero for a few seconds; then returned to normal reading. Eventually the N3 indication failed; and the left engine bleed EICAS came on and stayed on. We ran QRH for left engine bleed; and noticed cabin pressurization fluctuating somewhat; but functioning properly. Approximately 5 minutes later; passing FL300; the cabin pressurization failed and we got a cabin altitude warning horn and EICAS message. We performed the phase one procedures and immediately descended to 12;000 feet (for terrain). Both of us felt mildly hypoxic; but after a few minutes of breathing 100% oxygen we felt our sa (situational awareness) return and continued on to [destination]. Landed uneventfully. First officer (first officer) did a fantastic job.apparent failure of the right pack; or cabin altitude controller. Tbd based upon maintenance findings.
Original NASA ASRS Text
Title: B757-200 Captain reported loss of cabin pressure related to either pack or cabin altitude controller failure.
Narrative: Had a MEL deferral for L engine N3 indication; and on climbout received numerous brief L ENG BLEED EICAS messages as the N3 indicator went to zero for a few seconds; then returned to normal reading. Eventually the N3 indication failed; and the L ENG BLEED EICAS came on and stayed on. We ran QRH for L ENG BLEED; and noticed cabin pressurization fluctuating somewhat; but functioning properly. Approximately 5 minutes later; passing FL300; the cabin pressurization failed and we got a cabin altitude warning horn and EICAS message. We performed the phase one procedures and immediately descended to 12;000 feet (for terrain). Both of us felt mildly hypoxic; but after a few minutes of breathing 100% oxygen we felt our SA (Situational Awareness) return and continued on to [destination]. Landed uneventfully. FO (First Officer) did a fantastic job.Apparent failure of the right PACK; or cabin altitude controller. TBD based upon maintenance findings.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.