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B737-700 flight crew reported returning to departure airport after the aircraft failed to pressurize. Later; engine bleed switches were found to be in the off position.
| Attributes | |
| ACN | 1341383 |
| Time | |
| Date | 201603 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Flight Phase | Climb |
| Component | |
| Aircraft Component | Pneumatic Valve/Bleed Valve |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 164 |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Experience | Flight Crew Last 90 Days 200 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
Climbing thru approximately 12;000 feet; the cabin altitude warning light illuminated along with the cabin altitude warning horn sounding. The first officer (first officer) was flying and I directed him to immediately descend. I notified ATC of the situation and was cleared to 9;000 feet. While descending I ran the qrc and at 9;000 feet the QRH and briefed the flight attendants. I determined that the pressurization could not be controlled. I made a brief PA to the passengers that we had a pressurization issue and were returning to [departure airport]. I called operations on company radio to apprise them and that I was returning to land. Dispatch was notified via ACARS of my intentions to land. The aircraft landed uneventfully and was met by a customer service agent to assist the passengers. I have been told by my chief pilot that the bleeds were left off. Make sure all checklist items are checked. Apparently the engine bleed switches were missed by both pilots; 'what you want to see is not necessarily what you see!'
Original NASA ASRS Text
Title: B737-700 flight crew reported returning to departure airport after the aircraft failed to pressurize. Later; engine bleed switches were found to be in the off position.
Narrative: Climbing thru approximately 12;000 feet; the Cabin Altitude Warning light illuminated along with the Cabin Altitude Warning horn sounding. The First Officer (FO) was flying and I directed him to immediately descend. I notified ATC of the situation and was cleared to 9;000 feet. While descending I ran the QRC and at 9;000 feet the QRH and briefed the Flight Attendants. I determined that the pressurization could not be controlled. I made a brief PA to the Passengers that we had a pressurization issue and were returning to [departure airport]. I called Operations on Company radio to apprise them and that I was returning to land. Dispatch was notified via ACARS of my intentions to land. The aircraft landed uneventfully and was met by a Customer Service Agent to assist the passengers. I have been told by my Chief Pilot that the bleeds were left off. Make sure ALL checklist items are CHECKED. Apparently the engine bleed switches were missed by both pilots; 'what you want to see is NOT necessarily what you see!'
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.