B727 crew had a cockpit window come open on takeoff. A high speed abort was conducted.

Attributes
ACN	475280
Time
Date	200006
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : private pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 90 flight time total : 4700 flight time type : 90
ASRS Report	475280
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb other other : 3
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During flight I decided to initiate a rejected takeoff on runway 31C at midway airport in chicago, il. During the takeoff at well above 100 KTS, I heard a loud and unusual change in the noise level in the cockpit. I was unsure of what had happened, and I decided not to continue the takeoff. Once the aircraft was brought to a complete stop, I realized that the first officer's window had blown open. I taxied the aircraft clear the active runway and coordinated with the tower as to where to position the aircraft. No one was injured. A new latch in the window corrected the problem.

Original NASA ASRS Text

Title: B727 CREW HAD A COCKPIT WINDOW COME OPEN ON TKOF. A HIGH SPD ABORT WAS CONDUCTED.

Narrative: DURING FLT I DECIDED TO INITIATE A REJECTED TKOF ON RWY 31C AT MIDWAY ARPT IN CHICAGO, IL. DURING THE TKOF AT WELL ABOVE 100 KTS, I HEARD A LOUD AND UNUSUAL CHANGE IN THE NOISE LEVEL IN THE COCKPIT. I WAS UNSURE OF WHAT HAD HAPPENED, AND I DECIDED NOT TO CONTINUE THE TKOF. ONCE THE ACFT WAS BROUGHT TO A COMPLETE STOP, I REALIZED THAT THE FO'S WINDOW HAD BLOWN OPEN. I TAXIED THE ACFT CLR THE ACTIVE RWY AND COORDINATED WITH THE TWR AS TO WHERE TO POS THE ACFT. NO ONE WAS INJURED. A NEW LATCH IN THE WINDOW CORRECTED THE PROB.

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.