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Maintenance technician reported the pressurization system on a B737 was inoperative in auto and standby modes.
| Attributes | |
| ACN | 1568187 |
| Time | |
| Date | 201807 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization Control System |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
The aircraft returned to ZZZ for a loss of cabin pressurization. Altitude alert sounded to notify crew of an emergency. Climbing through FL230; lost the cabin pressurization. Altitude alert sounded. Captain advised first officer (first officer) to run the check list; captain had aircraft and radios. Requested immediate descent to MSA. Was given confirmation to descend to 14;000 ft; then continue descent to 10;000 ft. First officer and myself determined that we did not have auto and stby modes for cabin pressurization. For the safety of the crew and passengers; we requested a priority landing ; because I was not sure if I could maintain cabin pressurization in the manual mode. We returned to ZZZ; I was advised to do an operational test of the outflow valve in the manual mode by maintenance control. I performed a ops test of the outflow valve in the manual mode; and the ops test passed. Maintenance control advised me that I was to MEL and dmi the cabin pressurization and dispatch the aircraft. I dispatched the aircraft under MEL.
Original NASA ASRS Text
Title: Maintenance Technician reported the pressurization system on a B737 was inoperative in auto and standby modes.
Narrative: The aircraft returned to ZZZ for a loss of Cabin Pressurization. Altitude Alert sounded to notify crew of an emergency. Climbing through FL230; lost the cabin pressurization. Altitude Alert sounded. Captain advised First Officer (F/O) to run the check list; Captain had aircraft and radios. Requested immediate descent to MSA. Was given confirmation to descend to 14;000 ft; then continue descent to 10;000 ft. F/O and myself determined that we did not have Auto and STBY modes for cabin pressurization. For the safety of the crew and passengers; we requested a priority landing ; because I was not sure if I could maintain cabin pressurization in the Manual Mode. We returned to ZZZ; I was advised to do an operational test of the outflow valve in the manual mode by Maintenance Control. I performed a ops test of the outflow valve in the manual mode; and the ops test passed. Maintenance Control advised me that I was to MEL and DMI the cabin pressurization and dispatch the aircraft. I dispatched the aircraft under MEL.
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.