B757-200 crew had the passenger entrance door come open just after takeoff.

Attributes
ACN	568970
Time
Date	200212
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sea.airport
State Reference	WA
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sea.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	568970
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas warning other flight crewa other flight crewb other other : 3
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : diverted to another airport flight crew : declared emergency flight crew : landed in emergency condition other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After takeoff, we had an EICAS door unlocked message accompanied with loud wind noise and no pressurization. The #1 flight attendant reported the door appeared to be opening, which was followed by a loud noise. Return to sea was uneventful, an emergency was declared to assure that equipment would meet the aircraft -- primarily for brake inspection. Overweight landing was approximately 207000 pounds with negligible inspection was accomplished. On reflection, it appears door unlocked was due to wind/buffeting from high crosswind and light windshear conditions. The door handle did unlock completely and the door was moving in its framework until it probably seated itself during further buffeting on downwind, resulting in the loud noise.

Original NASA ASRS Text

Title: B757-200 CREW HAD THE PAX ENTRANCE DOOR COME OPEN JUST AFTER TKOF.

Narrative: AFTER TKOF, WE HAD AN EICAS DOOR UNLOCKED MESSAGE ACCOMPANIED WITH LOUD WIND NOISE AND NO PRESSURIZATION. THE #1 FLT ATTENDANT RPTED THE DOOR APPEARED TO BE OPENING, WHICH WAS FOLLOWED BY A LOUD NOISE. RETURN TO SEA WAS UNEVENTFUL, AN EMER WAS DECLARED TO ASSURE THAT EQUIP WOULD MEET THE ACFT -- PRIMARILY FOR BRAKE INSPECTION. OVERWT LNDG WAS APPROX 207000 LBS WITH NEGLIGIBLE INSPECTION WAS ACCOMPLISHED. ON REFLECTION, IT APPEARS DOOR UNLOCKED WAS DUE TO WIND/BUFFETING FROM HIGH XWIND AND LIGHT WINDSHEAR CONDITIONS. THE DOOR HANDLE DID UNLOCK COMPLETELY AND THE DOOR WAS MOVING IN ITS FRAMEWORK UNTIL IT PROBABLY SEATED ITSELF DURING FURTHER BUFFETING ON DOWNWIND, RESULTING IN THE LOUD NOISE.

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.