Center windshield shatters. Made emergency descent.

Attributes
ACN	166253
Time
Date	199012
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : stl
State Reference	MO
Altitude	msl bound lower : 25000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zkc tower : tol
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other other
Route In Use	enroute airway : j101
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8500
ASRS Report	166253
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	controller military : 7 controller radar : 19 flight time last 90 days : 200 flight time total : 8100 flight time type : 2300
ASRS Report	166252
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency none taken : insufficient time
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

During cruise at FL350, center windscreen ice protection overheated, causing windshield to shatter. Called center with request for emergency descent, received no reply. Squawked emergency and began descent. Soon into descent, established contact with center, asked them of situation and requested FL250. After level at FL250, stabilized situation and continued to destination.

Original NASA ASRS Text

Title: CENTER WINDSHIELD SHATTERS. MADE EMERGENCY DESCENT.

Narrative: DURING CRUISE AT FL350, CTR WINDSCREEN ICE PROTECTION OVERHEATED, CAUSING WINDSHIELD TO SHATTER. CALLED CTR WITH REQUEST FOR EMER DSNT, RECEIVED NO REPLY. SQUAWKED EMER AND BEGAN DSNT. SOON INTO DSNT, ESTABLISHED CONTACT WITH CTR, ASKED THEM OF SITUATION AND REQUESTED FL250. AFTER LEVEL AT FL250, STABILIZED SITUATION AND CONTINUED TO DEST.

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.