B737 flight crew experiences cracked eyebrow window middle pane at FL360 and diverts for repairs.

Attributes
ACN	759594
Time
Date	200710
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 36000
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 110 flight time total : 15000 flight time type : 6000
ASRS Report	759594
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

In cruise at FL360 heard loud pop and noticed first officer eyebrow window (R4) had several cracks throughout window on middle pane. Accomplished irregular procedure for window (cockpit) damage and diverted into ZZZ without further incident. 1 day prior to this I experienced a similar crack on inner pane of captain's sliding window (L2). Appropriate checklist procedures were followed and maintenance notified. Is there some defect in our cockpit windows that should be examined or addressed?

Original NASA ASRS Text

Title: B737 FLT CREW EXPERIENCES CRACKED EYEBROW WINDOW MIDDLE PANE AT FL360 AND DIVERTS FOR REPAIRS.

Narrative: IN CRUISE AT FL360 HEARD LOUD POP AND NOTICED FO EYEBROW WINDOW (R4) HAD SEVERAL CRACKS THROUGHOUT WINDOW ON MIDDLE PANE. ACCOMPLISHED IRREGULAR PROC FOR WINDOW (COCKPIT) DAMAGE AND DIVERTED INTO ZZZ WITHOUT FURTHER INCIDENT. 1 DAY PRIOR TO THIS I EXPERIENCED A SIMILAR CRACK ON INNER PANE OF CAPT'S SLIDING WINDOW (L2). APPROPRIATE CHKLIST PROCS WERE FOLLOWED AND MAINT NOTIFIED. IS THERE SOME DEFECT IN OUR COCKPIT WINDOWS THAT SHOULD BE EXAMINED OR ADDRESSED?

Data retrieved from NASA's ASRS site as of January 2009 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.