A ce-680 pilot reported seeing cas message window heat inoperative right; followed later in descent ...

Narrative:

At FL400 received amber windshield heat inoperative right. As the nonflying pilot I reached for the checklist and before I could pull it out the message went away. We reviewed the checklist. During descent the message occurred again; before I could find the circuit breaker the message went out. At about 8;000' on the STAR the message reoccurred. Before I pulled the circuit breaker the windshield cracked. I pulled the breaker and donned my smoke goggles for eye protection. We informed ATC of the windshield crack; requested priority handling and declared an emergency. A short time later the windshield heat inoperative left cas message illuminated; the captain pulled the left circuit breaker. We landed uneventfully.

Original NASA ASRS Text

Title: A CE-680 pilot reported seeing CAS message WINDOW HEAT INOP R; followed later in descent by the R windscreen cracking. The flight crew declared an emergency and landed without incident.

Narrative: At FL400 received amber WINDSHIELD HEAT INOP R. As the nonflying pilot I reached for the checklist and before I could pull it out the message went away. We reviewed the checklist. During descent the message occurred again; before I could find the circuit breaker the message went out. At about 8;000' on the STAR the message reoccurred. Before I pulled the circuit breaker the windshield cracked. I pulled the breaker and donned my smoke goggles for eye protection. We informed ATC of the windshield crack; requested priority handling and declared an emergency. A short time later the WINDSHIELD HEAT INOP L CAS message illuminated; the Captain pulled the left circuit breaker. We landed uneventfully.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	883203
Time
Date	201004
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Cessna Citation Sovereign (C680)
Operating Under FAR Part	Part 91
Flight Phase	Descent
Component
Aircraft Component	Cockpit Window
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

A ce-680 pilot reported seeing cas message window heat inoperative right; followed later in descent by the right windscreen cracking. The flight crew declared an emergency and landed without incident.