A climbing departure B737-800 aircraft starts to lose cabin pressure at 13000 ft when the first officer had mistakenly turned off the engine bleeds instead of the APU bleed switch during after start at mdw, il.

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Attributes
ACN	524547
Time
Date	200109
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl bound lower : 13000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude climbout : vacating altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : atp pilot : cfi
Experience	flight time last 90 days : 80 flight time total : 6000 flight time type : 737
ASRS Report	524547
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 110 flight time total : 22000 flight time type : 110
ASRS Report	524548
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin pr alert
Resolutory Action	aircraft : equipment problem dissipated controller : issued advisory flight crew : overrode automation flight crew : returned to intended or assigned course flight crew : overcame equipment problem flight crew : became reoriented flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During my after start flow, when I should have switched off the APU bleed, I, in error, switched off the engine bleeds. During the climb checks, I saw a slow cabin climb and cabin diff, but did not catch my mistake. As we climbed through around 13000 ft, the cabin alert sounded. The captain quickly corrected my error and donned his oxygen mask. I pitched to a slow climb, donned my oxygen mask and with ATC's ok, leveled the plane. The situation quickly returned to normal. The cabin never exceeded 10000 ft. No emergency was declared and the flight was continued. Supplemental information from acn 524548: we advised ATC we were stopping at 15000 for a short time and then continued the climb to FL290. ATC had marked us level at 15000. We should have advised ATC before renewing climb.

Original NASA ASRS Text

Title: A CLIMBING DEP B737-800 ACFT STARTS TO LOSE CABIN PRESSURE AT 13000 FT WHEN THE FO HAD MISTAKENLY TURNED OFF THE ENG BLEEDS INSTEAD OF THE APU BLEED SWITCH DURING AFTER START AT MDW, IL.

Narrative: DURING MY AFTER START FLOW, WHEN I SHOULD HAVE SWITCHED OFF THE APU BLEED, I, IN ERROR, SWITCHED OFF THE ENG BLEEDS. DURING THE CLB CHECKS, I SAW A SLOW CABIN CLB AND CABIN DIFF, BUT DID NOT CATCH MY MISTAKE. AS WE CLIMBED THROUGH AROUND 13000 FT, THE CABIN ALERT SOUNDED. THE CAPT QUICKLY CORRECTED MY ERROR AND DONNED HIS OXYGEN MASK. I PITCHED TO A SLOW CLIMB, DONNED MY OXYGEN MASK AND WITH ATC'S OK, LEVELED THE PLANE. THE SIT QUICKLY RETURNED TO NORMAL. THE CABIN NEVER EXCEEDED 10000 FT. NO EMER WAS DECLARED AND THE FLT WAS CONTINUED. SUPPLEMENTAL INFO FROM ACN 524548: WE ADVISED ATC WE WERE STOPPING AT 15000 FOR A SHORT TIME AND THEN CONTINUED THE CLB TO FL290. ATC HAD MARKED US LEVEL AT 15000. WE SHOULD HAVE ADVISED ATC BEFORE RENEWING CLB.

Data retrieved from NASA's ASRS site as of July 2007 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.