B737 does not pressurize after takeoff from anc, ak.

Attributes
ACN	468641
Time
Date	200004
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : anc.airport
State Reference	AK
Altitude	msl single value : 5000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a11.tracon
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 : initial
Route In Use	departure sid : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 15000 flight time type : 2000
ASRS Report	468641
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

Shortly after takeoff, autopressurization failed. Ran checklist and determined that cabin could not be pressurized in automatic, standby, or manual. Notified flight attendants of possible return. Flight attendant called back and told us that there was a noticeable air noise at the bottom of door L2. With indications of a door seal problem we returned to the airport. Shortly after we got back on the ground, I got this nagging feeling that we had taken off unpressurized. Maintenance investigation showed the door to be ok. After initial pushback we had the aircraft deiced. Deicing calls for the engine bleeds to be turned off and remain off for 1 min after deicing to help prevent fluid from entering the ducts. I want to believe that we turned the bleeds back on because we went so far as to start the clock for a 1 min timing, and both noted when 1 min was up. Maintenance changed the pressure controller as a precaution, and we were eventually on our way. This event again shows the need to be extra vigilant whenever deviating from the routine.

Original NASA ASRS Text

Title: B737 DOES NOT PRESSURIZE AFTER TKOF FROM ANC, AK.

Narrative: SHORTLY AFTER TKOF, AUTOPRESSURIZATION FAILED. RAN CHKLIST AND DETERMINED THAT CABIN COULD NOT BE PRESSURIZED IN AUTO, STANDBY, OR MANUAL. NOTIFIED FLT ATTENDANTS OF POSSIBLE RETURN. FLT ATTENDANT CALLED BACK AND TOLD US THAT THERE WAS A NOTICEABLE AIR NOISE AT THE BOTTOM OF DOOR L2. WITH INDICATIONS OF A DOOR SEAL PROB WE RETURNED TO THE ARPT. SHORTLY AFTER WE GOT BACK ON THE GND, I GOT THIS NAGGING FEELING THAT WE HAD TAKEN OFF UNPRESSURIZED. MAINT INVESTIGATION SHOWED THE DOOR TO BE OK. AFTER INITIAL PUSHBACK WE HAD THE ACFT DEICED. DEICING CALLS FOR THE ENG BLEEDS TO BE TURNED OFF AND REMAIN OFF FOR 1 MIN AFTER DEICING TO HELP PREVENT FLUID FROM ENTERING THE DUCTS. I WANT TO BELIEVE THAT WE TURNED THE BLEEDS BACK ON BECAUSE WE WENT SO FAR AS TO START THE CLOCK FOR A 1 MIN TIMING, AND BOTH NOTED WHEN 1 MIN WAS UP. MAINT CHANGED THE PRESSURE CTLR AS A PRECAUTION, AND WE WERE EVENTUALLY ON OUR WAY. THIS EVENT AGAIN SHOWS THE NEED TO BE EXTRA VIGILANT WHENEVER DEVIATING FROM THE ROUTINE.

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.