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B737-800 first officer reported loss of cabin pressure at FL380.
| Attributes | |
| ACN | 1447059 |
| Time | |
| Date | 201705 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pneumatic System |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Shortly after reaching cruise; left bleed trip off light illuminated. Reset per QRH; within minutes same issue [recurred]; reset again and light remained out. Noted a large split duct pressure. Shortly after descent from FL380; the rt bleed trip light illuminated. Began checklist to reset light; [but it] appeared not to reset. We advised ATC we may have a pressurization problem and needed a descent lower than FL240 already assigned. This was granted.shortly after that the captain noted a spike in cabin [altitude] and told me to declare an emergency with ATC; and we started an emergency descent. I notified ATC and coordinated with the captain setting up a direct route to [destination] from present position. O2 masks were donned during this process; cabin was uncontrollable and we were now in a descent to 10;000 ft. At 10;000 ft we were able to stabilize and assess the situation; and prepare for an arrival after 3 gate changes and ATC notifications for medical personnel to meet us.a history of bleed malfunctions [had been] documented [on this aircraft] prior to this flight.
Original NASA ASRS Text
Title: B737-800 FO reported loss of cabin pressure at FL380.
Narrative: Shortly after reaching cruise; Left Bleed trip off light illuminated. Reset per QRH; within minutes same issue [recurred]; reset again and light remained out. Noted a large split duct pressure. Shortly after descent from FL380; the RT Bleed trip light illuminated. Began checklist to reset light; [but it] appeared not to reset. We advised ATC we may have a pressurization problem and needed a descent lower than FL240 already assigned. This was granted.Shortly after that the Captain noted a spike in cabin [altitude] and told me to declare an emergency with ATC; and we started an emergency descent. I notified ATC and coordinated with the Captain setting up a direct route to [destination] from present position. O2 masks were donned during this process; cabin was uncontrollable and we were now in a descent to 10;000 FT. At 10;000 FT we were able to stabilize and assess the situation; and prepare for an arrival after 3 gate changes and ATC notifications for medical personnel to meet us.A history of bleed malfunctions [had been] documented [on this aircraft] prior to this flight.
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.