An large transport returned to the field immediately after takeoff due to unable to pressurize the aircraft. Found equipment access door open and door warning system previously deferred.

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Attributes
ACN	362356
Time
Date	199702
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sea
State Reference	WA
Altitude	agl bound lower : 1000 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : sea artcc : zmp
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 800
ASRS Report	362356
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical inflight encounter other other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

On preflight, equipment door light would not extinguish with door verified closed. The mechanic deferred the door light. Prior to pushback, we twice verified with mechanic that door was closed. On takeoff, the aircraft would not pressurize and very noisy -- door was apparently open. We returned for an overweight landing.

Original NASA ASRS Text

Title: AN LGT RETURNED TO THE FIELD IMMEDIATELY AFTER TKOF DUE TO UNABLE TO PRESSURIZE THE ACFT. FOUND EQUIP ACCESS DOOR OPEN AND DOOR WARNING SYS PREVIOUSLY DEFERRED.

Narrative: ON PREFLT, EQUIP DOOR LIGHT WOULD NOT EXTINGUISH WITH DOOR VERIFIED CLOSED. THE MECH DEFERRED THE DOOR LIGHT. PRIOR TO PUSHBACK, WE TWICE VERIFIED WITH MECH THAT DOOR WAS CLOSED. ON TKOF, THE ACFT WOULD NOT PRESSURIZE AND VERY NOISY -- DOOR WAS APPARENTLY OPEN. WE RETURNED FOR AN OVERWT LNDG.

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.