<< >> NASA ASRS Report 883894, April 2010

A saab sf-340 captain reported pressurization problems when he mistakenly left the cabin dump switch open.

Attributes
ACN	883894
Time
Date	201004
Local Time Of Day	0601-1200
Place
Locale Reference	MEM.Airport
State Reference	TN
Environment
Light	Daylight
Aircraft 1
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 5000 Flight Crew Type 3000
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

Upon aircraft start the cabin pressurized and was uncomfortable so I turned on the emergency cabin dump switch. I failed to turn it off. During climb we received a cabin press light on the cwp at 10;500 ft. We leveled at 12;000 and while the first officer (the pilot monitoring) completed the checklist I was cleared to and descended to 10;000 ft. While completing the non-normal checklist I realized that I had not returned to emergency cabin dump switch to off. Once this was selected the pressurization returned to normal.

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Original NASA ASRS Text

Title: A Saab SF-340 Captain reported pressurization problems when he mistakenly left the cabin dump switch open.

Narrative: Upon aircraft start the cabin pressurized and was uncomfortable so I turned on the emergency cabin dump switch. I failed to turn it off. During climb we received a cabin press light on the CWP at 10;500 ft. We leveled at 12;000 and while the F/O (the pilot monitoring) completed the checklist I was cleared to and descended to 10;000 ft. While completing the Non-normal checklist I realized that I had not returned to Emergency cabin dump switch to off. Once this was selected the pressurization returned to normal.

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.