In cruise at FL330 first officer windshield began arcing from the windshield electrical heating unit. Heat turned off, flight crew obtained clearance, descended, landed nearest.

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Attributes
ACN	151932
Time
Date	199007
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : plch
State Reference	FO
Altitude	agl bound lower : 0 agl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time total : 15000
ASRS Report	151932
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance other other
Consequence	other Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Approximately 150 NM from christmas island en route from hnl the first officer's windshield began arcing. Window heat was turned off and the emergency checklist initiated. The windshield cracked in half vertical and a descent was initiated in VMC conditions. The checklist was completed and hnl arinc was advised of our departure from assigned altitude and an emergency was declared. The window continued cracking during descent. Leveled at 10000' and 250 KTS and continued to christmas island and landed.

Original NASA ASRS Text

Title: IN CRUISE AT FL330 FO WINDSHIELD BEGAN ARCING FROM THE WINDSHIELD ELECTRICAL HEATING UNIT. HEAT TURNED OFF, FLT CREW OBTAINED CLRNC, DESCENDED, LANDED NEAREST.

Narrative: APPROX 150 NM FROM CHRISTMAS ISLAND ENRTE FROM HNL THE F/O'S WINDSHIELD BEGAN ARCING. WINDOW HEAT WAS TURNED OFF AND THE EMER CHKLIST INITIATED. THE WINDSHIELD CRACKED IN HALF VERT AND A DSNT WAS INITIATED IN VMC CONDITIONS. THE CHKLIST WAS COMPLETED AND HNL ARINC WAS ADVISED OF OUR DEP FROM ASSIGNED ALT AND AN EMER WAS DECLARED. THE WINDOW CONTINUED CRACKING DURING DSNT. LEVELED AT 10000' AND 250 KTS AND CONTINUED TO CHRISTMAS ISLAND AND LANDED.

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.