Atx small transport windscreen shattered at cruise altitude. Flight crew diverted to alternate.

Attributes
ACN	130884
Time
Date	198912
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : crl
State Reference	MI
Altitude	msl bound lower : 19000 msl bound upper : 19000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 70 flight time total : 3740 flight time type : 1100
ASRS Report	130884
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp
Experience	flight time last 90 days : 95 flight time total : 3650 flight time type : 125
ASRS Report	130899
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

En route from sbn to iag, and level at FL190 for approximately 5 mins, we heard a loud bang. We noticed that the copilot's windscreen had shattered. I notified ZOB that we had a problem and would have to divert to the nearest airport and descend to a lower altitude immediately. ZOB advised that jxn was the closest airport. We were assigned a 360 degree heading and cleared to 9000'. We shut off the bleed air switch, slowed the airplane down and started a descent. ZOB handed us off to lansing approach, who vectored us to jxn, and we landed west/O any further incident or damage. With closer examination of the windscreen, we determined that the outside windshield was still intact, but showed signs of outward movement. The inside pane (glass portion) was completed shattered. The cause of this problem is unknown at this time.

Original NASA ASRS Text

Title: ATX SMT WINDSCREEN SHATTERED AT CRUISE ALT. FLT CREW DIVERTED TO ALTERNATE.

Narrative: ENRTE FROM SBN TO IAG, AND LEVEL AT FL190 FOR APPROX 5 MINS, WE HEARD A LOUD BANG. WE NOTICED THAT THE COPLT'S WINDSCREEN HAD SHATTERED. I NOTIFIED ZOB THAT WE HAD A PROB AND WOULD HAVE TO DIVERT TO THE NEAREST ARPT AND DSND TO A LOWER ALT IMMEDIATELY. ZOB ADVISED THAT JXN WAS THE CLOSEST ARPT. WE WERE ASSIGNED A 360 DEG HDG AND CLRED TO 9000'. WE SHUT OFF THE BLEED AIR SWITCH, SLOWED THE AIRPLANE DOWN AND STARTED A DSCNT. ZOB HANDED US OFF TO LANSING APCH, WHO VECTORED US TO JXN, AND WE LANDED W/O ANY FURTHER INCIDENT OR DAMAGE. WITH CLOSER EXAMINATION OF THE WINDSCREEN, WE DETERMINED THAT THE OUTSIDE WINDSHIELD WAS STILL INTACT, BUT SHOWED SIGNS OF OUTWARD MOVEMENT. THE INSIDE PANE (GLASS PORTION) WAS COMPLETED SHATTERED. THE CAUSE OF THIS PROB IS UNKNOWN AT THIS TIME.

Data retrieved from NASA's ASRS site as of August 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.