Air carrier large transport returns to land after captain's sliding window opens 3 inches.

Attributes
ACN	123978
Time
Date	198909
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : sea
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 110 flight time total : 12000 flight time type : 110
ASRS Report	123978
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 700
ASRS Report	123975
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On takeoff at approximately V1 captain sliding window opened approximately 3'. Noise level (very loud). We declared an emergency, returned to airport and landed. Aircraft was an large transport. We pulled the voice recorder on arrival at the gate.

Original NASA ASRS Text

Title: ACR LGT RETURNS TO LAND AFTER CAPT'S SLIDING WINDOW OPENS 3 INCHES.

Narrative: ON TKOF AT APPROX V1 CAPT SLIDING WINDOW OPENED APPROX 3'. NOISE LEVEL (VERY LOUD). WE DECLARED AN EMER, RETURNED TO ARPT AND LANDED. ACFT WAS AN LGT. WE PULLED THE VOICE RECORDER ON ARRIVAL AT THE GATE.

Data retrieved from NASA's ASRS site as of August 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.