A cpr HS25 flight crew had the captain's windscreen delaminate and craze to the extent that the captain could not see through it. He declared an emergency and the controller supplied a vector to an alternate.

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Attributes
ACN	391908
Time
Date	199801
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : txk
State Reference	AR
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	general aviation : corporate
Make Model Name	HS 125 Series 1-600
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 40 flight time total : 9800 flight time type : 275
ASRS Report	391908
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency other
Consequence	other Other
Supplementary
Primary Problem	Aircraft

Narrative:

I was climbing to FL370, passing through FL350 the pilot's windshield delaminated and crazed so badly that I could not see through it. I immediately declared an emergency with center. I said 'center this is xyz I am declaring an emergency. I have a broken windshield and I need to come down.' the controller at that time said roger maintain FL350. I told him that I had already started a descent and I was going to continue down. He said that the lowest I could descend at that time was FL310. I repeated that I was going to continue the descent. He stated that I could exercise the emergency option. I told him that I was doing that at the time. He asked how low I needed to go. I told him that I needed to get below 15000 ft. I had the aircraft slowed to 180 KIAS at that time with speed boards out. That let me come down at 4500 FPM. I requested the nearest airport and he vectored me to txk where we landed and had the windshield replaced.

Original NASA ASRS Text

Title: A CPR HS25 FLC HAD THE CAPT'S WINDSCREEN DELAMINATE AND CRAZE TO THE EXTENT THAT THE CAPT COULD NOT SEE THROUGH IT. HE DECLARED AN EMER AND THE CTLR SUPPLIED A VECTOR TO AN ALTERNATE.

Narrative: I WAS CLBING TO FL370, PASSING THROUGH FL350 THE PLT'S WINDSHIELD DELAMINATED AND CRAZED SO BADLY THAT I COULD NOT SEE THROUGH IT. I IMMEDIATELY DECLARED AN EMER WITH CTR. I SAID 'CTR THIS IS XYZ I AM DECLARING AN EMER. I HAVE A BROKEN WINDSHIELD AND I NEED TO COME DOWN.' THE CTLR AT THAT TIME SAID ROGER MAINTAIN FL350. I TOLD HIM THAT I HAD ALREADY STARTED A DSCNT AND I WAS GOING TO CONTINUE DOWN. HE SAID THAT THE LOWEST I COULD DSND AT THAT TIME WAS FL310. I REPEATED THAT I WAS GOING TO CONTINUE THE DSCNT. HE STATED THAT I COULD EXERCISE THE EMER OPTION. I TOLD HIM THAT I WAS DOING THAT AT THE TIME. HE ASKED HOW LOW I NEEDED TO GO. I TOLD HIM THAT I NEEDED TO GET BELOW 15000 FT. I HAD THE ACFT SLOWED TO 180 KIAS AT THAT TIME WITH SPD BOARDS OUT. THAT LET ME COME DOWN AT 4500 FPM. I REQUESTED THE NEAREST ARPT AND HE VECTORED ME TO TXK WHERE WE LANDED AND HAD THE WINDSHIELD REPLACED.

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.