B737-700 flight crew reported getting the cabin altitude warning horn on climbout; at which point th...

Attributes
ACN	1055975
Time
Date	201212
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Climb
Component
Aircraft Component	Pneumatic Valve/Bleed Valve
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 138 Flight Crew Type 138
Person 2
Function	Pilot Not Flying First Officer
Experience	Flight Crew Last 90 Days 213 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

During the climb; we got an altitude warning horn at approximately 11;000 ft MSL. I was hand-flying the aircraft; so I smoothly leveled the aircraft off at 12;000 ft while my first officer donned his oxygen mask. I notified ATC that we were going to stop our climb at 12;000 ft then I donned my oxygen mask. In the meantime; my first officer realized that the engine bleeds were off and the APU bleed was turned on. He turned on the left engine bleed air; turned off the APU bleed air (the APU was off); and the cabin slowly began to descend. Once the cabin began to descend; we turned on the remaining engine bleed air. The cabin altitude descended below 10;000 ft within a minute; so we removed our oxygen masks and checked the QRH cabin altitude warning checklist. We then resumed a normal climb.

Original NASA ASRS Text

Title: B737-700 flight crew reported getting the cabin altitude warning horn on climbout; at which point they realized the engine bleeds were off.

Narrative: During the climb; we got an altitude warning horn at approximately 11;000 FT MSL. I was hand-flying the aircraft; so I smoothly leveled the aircraft off at 12;000 FT while my First Officer donned his oxygen mask. I notified ATC that we were going to stop our climb at 12;000 FT then I donned my oxygen mask. In the meantime; my First Officer realized that the engine bleeds were off and the APU bleed was turned on. He turned on the left engine bleed air; turned off the APU bleed air (the APU was off); and the cabin slowly began to descend. Once the cabin began to descend; we turned on the remaining engine bleed air. The cabin altitude descended below 10;000 FT within a minute; so we removed our oxygen masks and checked the QRH Cabin Altitude Warning Checklist. We then resumed a normal climb.

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.