A B737-800 first officer failed to note his cockpit window was not securely latched until it opened ...

Attributes
ACN	926137
Time
Date	201101
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Cockpit Window
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

On the takeoff roll the first officer's side window popped open and slid to full aft position. He managed to close and latch the window prior to 80 KTS. On climbout he reported a loud squeal from the window and discovered his headset cord had become entangled in the upper aft part of the window and inhibited a good seal. We leveled at 7;000 ft and requested return to our departure airport. Conferred with dispatch for landing data and maintenance control regarding our expected overweight landing. Landing was normal and soft.the first officer reported he did not open the window at any time prior to the incident. We were unable to determine if the window was unlatched prior to his duties or if it was a mechanical failure of the window latch.

Original NASA ASRS Text

Title: A B737-800 First Officer failed to note his cockpit window was not securely latched until it opened on takeoff roll. His attempt to resecure it failed when his headset cord was caught and caused an excessively loud pressure leak. A return to the departure airport was necessary.

Narrative: On the takeoff roll the First Officer's side window popped open and slid to full aft position. He managed to close and latch the window prior to 80 KTS. On climbout he reported a loud squeal from the window and discovered his headset cord had become entangled in the upper aft part of the window and inhibited a good seal. We leveled at 7;000 FT and requested return to our departure airport. Conferred with Dispatch for landing data and Maintenance Control regarding our expected overweight landing. Landing was normal and soft.The First Officer reported he did not open the window at any time prior to the incident. We were unable to determine if the window was unlatched prior to his duties or if it was a mechanical failure of the window latch.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737-800 first officer failed to note his cockpit window was not securely latched until it opened on takeoff roll. His attempt to resecure it failed when his headset cord was caught and caused an excessively loud pressure leak. A return to the departure airport was necessary.