B737 flight crew experiences cockpit window overheat after takeoff and a second warning in cruise ca...

Attributes
ACN	762632
Time
Date	200711
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 800
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	762632
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	762635
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : master caution other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After takeoff at 800 ft AGL master caution (anti-ice) illuminated along with right; side window overheat light. Complied with entire procedure in QRH. After 5 min cool down period; window remained in overheat condition. Upon inspection of all windows we noticed that the captain's front window (L1) had a small area of possible inner pane delamination and discoloration at top center of glass. The condition of the (L1) window did not warrant further action other than monitoring. After approximately 20 mins of cruise flight the master caution (anti-ice) illuminated along with the left forward window overheat. Inspection of captain's (L1) window revealed horizontal cracking with delamination across the entire width of window. We immediately complied with the procedure for 'use of cockpit oxygen masks' and complied with QRH procedure for 'window overheat.' while slowing the aircraft we heard and saw multiple cracks rapidly develop. We declared an emergency; requested immediate descent; notified ATC; dispatch and the cabin crew of our diversion to ZZZ. We were vectored for a visual approach. Captain lowered seat and first officer accomplished safe and uneventful landing.

Original NASA ASRS Text

Title: B737 FLT CREW EXPERIENCES COCKPIT WINDOW OVERHEAT AFTER TKOF AND A SECOND WARNING IN CRUISE CAUSING WINDOW CRACKING AND DELIMITATION. FLT CREW DIVERTS TO NEAREST SUITABLE ARPT FOR UNEVENTFUL LANDING.

Narrative: AFTER TKOF AT 800 FT AGL MASTER CAUTION (ANTI-ICE) ILLUMINATED ALONG WITH R; SIDE WINDOW OVERHEAT LIGHT. COMPLIED WITH ENTIRE PROC IN QRH. AFTER 5 MIN COOL DOWN PERIOD; WINDOW REMAINED IN OVERHEAT CONDITION. UPON INSPECTION OF ALL WINDOWS WE NOTICED THAT THE CAPT'S FRONT WINDOW (L1) HAD A SMALL AREA OF POSSIBLE INNER PANE DELAMINATION AND DISCOLORATION AT TOP CTR OF GLASS. THE CONDITION OF THE (L1) WINDOW DID NOT WARRANT FURTHER ACTION OTHER THAN MONITORING. AFTER APPROX 20 MINS OF CRUISE FLT THE MASTER CAUTION (ANTI-ICE) ILLUMINATED ALONG WITH THE L FORWARD WINDOW OVERHEAT. INSPECTION OF CAPT'S (L1) WINDOW REVEALED HORIZ CRACKING WITH DELAMINATION ACROSS THE ENTIRE WIDTH OF WINDOW. WE IMMEDIATELY COMPLIED WITH THE PROC FOR 'USE OF COCKPIT OXYGEN MASKS' AND COMPLIED WITH QRH PROC FOR 'WINDOW OVERHEAT.' WHILE SLOWING THE ACFT WE HEARD AND SAW MULTIPLE CRACKS RAPIDLY DEVELOP. WE DECLARED AN EMER; REQUESTED IMMEDIATE DSCNT; NOTIFIED ATC; DISPATCH AND THE CABIN CREW OF OUR DIVERSION TO ZZZ. WE WERE VECTORED FOR A VISUAL APCH. CAPT LOWERED SEAT AND FO ACCOMPLISHED SAFE AND UNEVENTFUL LNDG.

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.

B737 flight crew experiences cockpit window overheat after takeoff and a second warning in cruise causing window cracking and delimitation. Flight crew diverts to nearest suitable airport for uneventful landing.