Medium large transport at cruise has windscreen crack. Emergency declared, descent made.

Attributes
ACN	263050
Time
Date	199402
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ave
State Reference	CA
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other other other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 225 flight time total : 8000 flight time type : 225
ASRS Report	263050
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 2700
ASRS Report	263064
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	other Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At FL330 a loud bang was heard and the first officer R-1 windscreen was observed to be cracked. Structural integrity was in question, an emergency was declared and an emergency descent was initiated to the MEA/7000 ft. The 'cracked window/in-flight' irregular checklist was accomplished and a vector accepted towards the nearest suitable airport -- navy lemoor. The cabin altitude was increased and differential pressure to '0' at approximately 10000 ft. Level at 7000 ft, it was determined that structural integrity was not compromised and an immediate landing (at navy lemoor) was not required. ATC was advised that normal flight handling would suffice and the emergency handling not required. A normal unpressurized flight was made back to sfo. All irregular and normal procedures were accomplished and company dispatch advised. A normal landing was made at sfo. Supplemental information from acn 263064: dispatch was advised and consulted on the return to sfo. Parking at gate in sfo, mr. X from the FAA asked if there were any injuries (no) or a rapid decompression (no) and said that this would probably be classified as an occurrence not an incident. Our names and certificate numbers were collected by mr. X.

Original NASA ASRS Text

Title: MLG AT CRUISE HAS WINDSCREEN CRACK. EMER DECLARED, DSCNT MADE.

Narrative: AT FL330 A LOUD BANG WAS HEARD AND THE FO R-1 WINDSCREEN WAS OBSERVED TO BE CRACKED. STRUCTURAL INTEGRITY WAS IN QUESTION, AN EMER WAS DECLARED AND AN EMER DSCNT WAS INITIATED TO THE MEA/7000 FT. THE 'CRACKED WINDOW/INFLT' IRREGULAR CHKLIST WAS ACCOMPLISHED AND A VECTOR ACCEPTED TOWARDS THE NEAREST SUITABLE ARPT -- NAVY LEMOOR. THE CABIN ALT WAS INCREASED AND DIFFERENTIAL PRESSURE TO '0' AT APPROX 10000 FT. LEVEL AT 7000 FT, IT WAS DETERMINED THAT STRUCTURAL INTEGRITY WAS NOT COMPROMISED AND AN IMMEDIATE LNDG (AT NAVY LEMOOR) WAS NOT REQUIRED. ATC WAS ADVISED THAT NORMAL FLT HANDLING WOULD SUFFICE AND THE EMER HANDLING NOT REQUIRED. A NORMAL UNPRESSURIZED FLT WAS MADE BACK TO SFO. ALL IRREGULAR AND NORMAL PROCS WERE ACCOMPLISHED AND COMPANY DISPATCH ADVISED. A NORMAL LNDG WAS MADE AT SFO. SUPPLEMENTAL INFO FROM ACN 263064: DISPATCH WAS ADVISED AND CONSULTED ON THE RETURN TO SFO. PARKING AT GATE IN SFO, MR. X FROM THE FAA ASKED IF THERE WERE ANY INJURIES (NO) OR A RAPID DECOMPRESSION (NO) AND SAID THAT THIS WOULD PROBABLY BE CLASSIFIED AS AN OCCURRENCE NOT AN INCIDENT. OUR NAMES AND CERTIFICATE NUMBERS WERE COLLECTED BY MR. X.

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.