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B737-700 captain reported cabin climbed to 9;000 feet; so packs were put in high flow mode to control pressurization.
| Attributes | |
| ACN | 1061261 |
| Time | |
| Date | 201301 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 93 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
While at FL380 in cruise flight; the 'a' flight attendant advised us of some kind of noise he was hearing in the forward galley area of the aircraft. We looked at our pressurization panel and noticed that the cabin was around 9;000 feet and the vertical rate on the cabin was above 500 feet per minute. We had no indication on the flight deck that the cabin was indeed rising. We decided to put the packs in high mode while we reviewed the checklist. It took just a few seconds with the packs in high mode for the cabin to start coming back down and stabilizing. We decided to leave the packs in high mode until FL180 when we performed our descent checklist. The aircraft was taken out of service upon our arrival. Hopefully they can find out what the issue is with the pressurization system on this aircraft.
Original NASA ASRS Text
Title: B737-700 Captain reported cabin climbed to 9;000 feet; so packs were put in high flow mode to control pressurization.
Narrative: While at FL380 in cruise flight; the 'A' Flight Attendant advised us of some kind of noise he was hearing in the forward galley area of the aircraft. We looked at our pressurization panel and noticed that the cabin was around 9;000 feet and the vertical rate on the cabin was above 500 feet per minute. We had no indication on the Flight Deck that the cabin was indeed rising. We decided to put the packs in high mode while we reviewed the checklist. It took just a few seconds with the packs in high mode for the cabin to start coming back down and stabilizing. We decided to leave the packs in high mode until FL180 when we performed our descent checklist. The aircraft was taken out of service upon our arrival. Hopefully they can find out what the issue is with the pressurization system on this aircraft.
Data retrieved from NASA's ASRS site as of July 2013 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.