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An oceanic B757-200 lost partial pressurization following a heat exchanger duct rupture. The flight diverted to a nearby airport.
| Attributes | |
| ACN | 839381 |
| Time | |
| Date | 200906 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZZ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Conditioning Distribution Ducting Clamps Connectors |
| Person 1 | |
| Function | Captain |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Event happened about 170 NM southwest of ZZZZ. I was on crew rest. I was notified by a flight attendant that the cockpit crew needed me. I arrived in cockpit to find that both crewmembers were on O2 and already involved in an emergency descent. I sat in my seat; put my O2 mask on; received a briefing from the first officer flying; and took over the pilot monitoring duties. The QRH emergency checklist items had already been accomplished by the first officer flying and the first officer monitoring; and I reviewed the checklist items and completed the secondary items. I noted that the cabin pressure was at about 12;000' and climbing and the red EICAS message 'cabin altitude' was on. As the first officer flying continued the descent; I saw that the cabin altitude was coming under control and decreasing. The decision had already been made to divert to ZZZZ; and I concurred. We continued and made a normal landing.cause: blown heat exchanger duct in right pack.
Original NASA ASRS Text
Title: An oceanic B757-200 lost partial pressurization following a heat exchanger duct rupture. The flight diverted to a nearby airport.
Narrative: Event happened about 170 NM SW of ZZZZ. I was on crew rest. I was notified by a Flight Attendant that the cockpit crew needed me. I arrived in cockpit to find that both crewmembers were on O2 and already involved in an emergency descent. I sat in my seat; put my O2 mask on; received a briefing from the First Officer flying; and took over the pilot monitoring duties. The QRH emergency checklist items had already been accomplished by the First Officer flying and the First Officer monitoring; and I reviewed the checklist items and completed the secondary items. I noted that the cabin pressure was at about 12;000' and climbing and the red EICAS message 'Cabin ALT' was on. As the First Officer flying continued the descent; I saw that the cabin altitude was coming under control and decreasing. The decision had already been made to divert to ZZZZ; and I concurred. We continued and made a normal landing.Cause: Blown heat exchanger duct in right pack.
Data retrieved from NASA's ASRS site as of April 2012 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.