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B737-700 flight crew experienced a right bleed trip at FL400 which could not be reset. Just after beginning descent for landing the left bleed trips causing the cabin altitude to reach 22000 feet during the descent. A normal landing ensues at destination with one passenger being treated by paramedics for ear problems.
| Attributes | |
| ACN | 957009 |
| Time | |
| Date | 201107 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Component | |
| Aircraft Component | Engine Air |
| Person 1 | |
| Function | First Officer |
| Experience | Flight Crew Last 90 Days 260 |
| Person 2 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 180 Flight Crew Type 7500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
At FL400; the right bleed trip off illuminated. We ran the checklist and the bleed would not reset. At the beginning of the descent; approximately FL390; the left bleed trip off light illuminated. We donned the O2 masks and ran the emergency descent checklist as the pressurization was uncontrollable. Upon level off at 10;000 feet; the checklist was completed. The cabin altitude reached approximately FL220. Paramedics were called due to a customer complaining of ear problems. Communication between the captain and me was difficult due the ambient noise and difficulty communicating through the O2 mask. The flight attendants were difficult to understand as well due to the noise. Communication with the flight attendants was also difficult through the mask microphone. They were not able to understand the captain very well.
Original NASA ASRS Text
Title: B737-700 flight crew experienced a right bleed trip at FL400 which could not be reset. Just after beginning descent for landing the left bleed trips causing the cabin altitude to reach 22000 feet during the descent. A normal landing ensues at destination with one passenger being treated by paramedics for ear problems.
Narrative: At FL400; the right bleed trip off illuminated. We ran the checklist and the bleed would not reset. At the beginning of the descent; approximately FL390; the left bleed trip off light illuminated. We donned the O2 masks and ran the Emergency Descent checklist as the pressurization was uncontrollable. Upon level off at 10;000 feet; the checklist was completed. The cabin altitude reached approximately FL220. Paramedics were called due to a Customer complaining of ear problems. Communication between the Captain and me was difficult due the ambient noise and difficulty communicating through the O2 mask. The Flight Attendants were difficult to understand as well due to the noise. Communication with the Flight Attendants was also difficult through the mask microphone. They were not able to understand the Captain very well.
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.