Medium large transport at high altitude has first officer window arc and crack. Emergency declared.

Attributes
ACN	289285
Time
Date	199411
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dca
State Reference	DC
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 215 flight time total : 16069 flight time type : 8130
ASRS Report	289285
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other Other
Supplementary
Primary Problem	Aircraft

Narrative:

En route iah to phl, first officer's R-1 window began arcing and cracked. I declared an emergency and began descent. I notified center, flight attendants and passenger we were diverting to dca. I instructed the first officer to accomplish the abnormal checklist and we landed in dca without incident. By declaring an emergency and squawking 7700, our situation was handled in a very timely and efficient manner. It is great to have a group of professionals working with you in an emergency. Also it is imperative that 1 pilot is always flying the aircraft, while the other accomplishes the checklists.

Original NASA ASRS Text

Title: MLG AT HIGH ALT HAS FO WINDOW ARC AND CRACK. EMER DECLARED.

Narrative: ENRTE IAH TO PHL, FO'S R-1 WINDOW BEGAN ARCING AND CRACKED. I DECLARED AN EMER AND BEGAN DSCNT. I NOTIFIED CTR, FLT ATTENDANTS AND PAX WE WERE DIVERTING TO DCA. I INSTRUCTED THE FO TO ACCOMPLISH THE ABNORMAL CHKLIST AND WE LANDED IN DCA WITHOUT INCIDENT. BY DECLARING AN EMER AND SQUAWKING 7700, OUR SIT WAS HANDLED IN A VERY TIMELY AND EFFICIENT MANNER. IT IS GREAT TO HAVE A GROUP OF PROFESSIONALS WORKING WITH YOU IN AN EMER. ALSO IT IS IMPERATIVE THAT 1 PLT IS ALWAYS FLYING THE ACFT, WHILE THE OTHER ACCOMPLISHES THE CHKLISTS.

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.