B777 pilot reported a cockpit window overheat; resulting in an arcing and cracking of the outer pane...

Attributes
ACN	1688830
Time
Date	201910
Local Time Of Day	0001-0600
Place
Locale Reference	KZAK.ARTCC
State Reference	HI
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Window Ice/Rain System
Person 1
Function	Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

Just after the first crew break I was called back to the cockpit. The [relief pilot] noticed the left main window arcing and then the cracking of the outer pane. EICAS message of window overheat; following the checklist and turned off the power to the affected window. There was no deforming; bowing; or air leak associated with this window. The flight continued normally to destination. Window got hot.

Original NASA ASRS Text

Title: B777 pilot reported a cockpit window overheat; resulting in an arcing and cracking of the outer pane.

Narrative: Just after the first crew break I was called back to the cockpit. The [Relief Pilot] noticed the left main window arcing and then the cracking of the outer pane. EICAS message of window overheat; following the checklist and turned off the power to the affected window. There was no deforming; bowing; or air leak associated with this window. The flight continued normally to destination. Window got hot.

Data retrieved from NASA's ASRS site 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.