First officer side window open on takeoff roll.

Attributes
ACN	219060
Time
Date	199208
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 3000 flight time type : 400
ASRS Report	219060
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On preflight both captain and first officer sliding window were open to cool cockpit. Prior to start both windows were closed and locking handle was engaged. All checklists normal. On takeoff roll passing 10-20 KTS first officer window came partially open. Takeoff aborted. Normal methods of closing window failed, so aircraft returned to gate. Mechanics came on board, applied pressure to aft frame of window together with cranking window closed. Flight proceeded without further incident. Contributing factors: window crank has a clutch that prevents cable from breaking. Clutch usually disengages only when window is fully closed. This time window was not over center when clutch disengaged. Window was closed enough so that cockpit noise level was normal. Window closing handle was checked and pulled to assure it was locked but this failed to disclose window was not fully locked. 95% of time I verify actuator arm was over center and the word 'closed' is plainly visible in indicator but this must have been the other 5% as I don't remember reading closed. An AM30 local departure may have something to contribute. Just glad it didn't happen at 120 KTS.

Original NASA ASRS Text

Title: FO SIDE WINDOW OPEN ON TKOF ROLL.

Narrative: ON PREFLT BOTH CAPT AND FO SLIDING WINDOW WERE OPEN TO COOL COCKPIT. PRIOR TO START BOTH WINDOWS WERE CLOSED AND LOCKING HANDLE WAS ENGAGED. ALL CHKLISTS NORMAL. ON TKOF ROLL PASSING 10-20 KTS FO WINDOW CAME PARTIALLY OPEN. TKOF ABORTED. NORMAL METHODS OF CLOSING WINDOW FAILED, SO ACFT RETURNED TO GATE. MECHS CAME ON BOARD, APPLIED PRESSURE TO AFT FRAME OF WINDOW TOGETHER WITH CRANKING WINDOW CLOSED. FLT PROCEEDED WITHOUT FURTHER INCIDENT. CONTRIBUTING FACTORS: WINDOW CRANK HAS A CLUTCH THAT PREVENTS CABLE FROM BREAKING. CLUTCH USUALLY DISENGAGES ONLY WHEN WINDOW IS FULLY CLOSED. THIS TIME WINDOW WAS NOT OVER CTR WHEN CLUTCH DISENGAGED. WINDOW WAS CLOSED ENOUGH SO THAT COCKPIT NOISE LEVEL WAS NORMAL. WINDOW CLOSING HANDLE WAS CHKED AND PULLED TO ASSURE IT WAS LOCKED BUT THIS FAILED TO DISCLOSE WINDOW WAS NOT FULLY LOCKED. 95% OF TIME I VERIFY ACTUATOR ARM WAS OVER CTR AND THE WORD 'CLOSED' IS PLAINLY VISIBLE IN INDICATOR BUT THIS MUST HAVE BEEN THE OTHER 5% AS I DON'T REMEMBER READING CLOSED. AN AM30 LCL DEP MAY HAVE SOMETHING TO CONTRIBUTE. JUST GLAD IT DIDN'T HAPPEN AT 120 KTS.

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.