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After receiving a 'descend via' clearance from ATC and setting the altitude alert at 4;000 ft per the procedure the flight crew of a B737NG received a cabin altitude warning and began an emergency descent; cleared to 10;000 ft. They failed to reset the new cleared altitude and a modest overshoot occurred before ATC recleared them to 9;000 ft.
| Attributes | |
| ACN | 1205299 |
| Time | |
| Date | 201409 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| 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 138 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Overshoot Deviation - Procedural Clearance |
Narrative:
The cabin altitude warning horn sounded at FL330. An emergency descent was initiated and an emergency was declared. I was given direct [to our destination] and a descent to 10;000 ft. I let the aircraft descend to 9600 ft. When I checked in with approach; ATC gave me 9000 ft. A visual approach was flown to runway 26.prior to the emergency descent; we had been cleared to descend via the SID; 4000 ft was set in the altitude window. After donning the O2 masks and starting the descent; a good cross check of the FMC and CDU should have been accomplished.
Original NASA ASRS Text
Title: After receiving a 'descend via' clearance from ATC and setting the altitude alert at 4;000 FT per the procedure the flight crew of a B737NG received a cabin altitude warning and began an emergency descent; cleared to 10;000 FT. They failed to reset the new cleared altitude and a modest overshoot occurred before ATC recleared them to 9;000 FT.
Narrative: The Cabin Altitude Warning horn sounded at FL330. An emergency descent was initiated and an emergency was declared. I was given direct [to our destination] and a descent to 10;000 FT. I let the aircraft descend to 9600 FT. When I checked in with approach; ATC gave me 9000 FT. A visual approach was flown to RWY 26.Prior to the Emergency Descent; we had been cleared to descend via the SID; 4000 FT was set in the Altitude window. After donning the O2 masks and starting the descent; a good cross check of the FMC and CDU should have been accomplished.
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.