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A B737-300 flight crew made a timely emergency descent and diverted to a nearby airport when they were unable to control the cabin altitude with either the automatic or standby modes.
| Attributes | |
| ACN | 930067 |
| Time | |
| Date | 201101 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Flight Engineer Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 120 Flight Crew Total 28000 Flight Crew Type 24000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
In cruise at FL330 the cabin altitude warning horn came on. Put mask on and could not control the cabin with auto or standby. Asked ATC for lower due to a pressurization problem and were cleared down to 10;000. ATC asked us where we wanted to go and we said ZZZ. I checked with the flight attendants who advised they and the passengers were fine and the masks didn't drop. I told them we had a pressurization problem but everything was ok and we were diverting and would be there in 20 minutes for a precautionary landing. I then made a PA to the passengers.ATC asked if we needed crash trucks or assistance. We said everything was fine and we did not. We landed with no problem; taxied to gate; wrote it up and talked to maintenance.
Original NASA ASRS Text
Title: A B737-300 flight crew made a timely emergency descent and diverted to a nearby airport when they were unable to control the cabin altitude with either the automatic or standby modes.
Narrative: In cruise at FL330 the Cabin Altitude Warning Horn came on. Put mask on and could not control the cabin with auto or standby. Asked ATC for lower due to a pressurization problem and were cleared down to 10;000. ATC asked us where we wanted to go and we said ZZZ. I checked with the Flight Attendants who advised they and the passengers were fine and the masks didn't drop. I told them we had a pressurization problem but everything was OK and we were diverting and would be there in 20 minutes for a precautionary landing. I then made a PA to the passengers.ATC asked if we needed crash trucks or assistance. We said everything was fine and we did NOT. We landed with no problem; taxied to gate; wrote it up and talked to Maintenance.
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.