Large transport has loss of pressurization. Emergency descent.

Attributes
ACN	247312
Time
Date	199307
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mke
State Reference	WI
Altitude	msl bound lower : 10000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 13000
ASRS Report	247312
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

The aircraft cabin began an uncontrolled climb to 12000 cabin altitude. The horn sounded and the emergency checklist and descent started. We leveled off at 10000 ft MSL and diverted to dtw. The oxygen masks did not come down and no one was hurt. There was a ship change and the flight continued to lga.

Original NASA ASRS Text

Title: LGT HAS LOSS OF PRESSURIZATION. EMER DSCNT.

Narrative: THE ACFT CABIN BEGAN AN UNCTLED CLB TO 12000 CABIN ALT. THE HORN SOUNDED AND THE EMER CHKLIST AND DSCNT STARTED. WE LEVELED OFF AT 10000 FT MSL AND DIVERTED TO DTW. THE OXYGEN MASKS DID NOT COME DOWN AND NO ONE WAS HURT. THERE WAS A SHIP CHANGE AND THE FLT CONTINUED TO LGA.

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.