B767-300 crew lost cabin pressurization and made an emergency descent in sbbs class a.

Attributes
ACN	629567
Time
Date	200409
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sbgr.airport
State Reference	FO
Altitude	msl single value : 31000
Aircraft 1
Controlling Facilities	artcc : sbbs.artcc
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 4000
ASRS Report	629567
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : cabin altitude warning horn other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport flight crew : declared emergency flight crew : landed in emergency condition other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Approximately 23 mins into the flight at cruise the cabin altitude horn sounded. We donned the oxygen mask, declared an emergency and accomplished the qrc: cabin altitude and emergency descent. We descended to FL100 and returned to sbgr. At FL100 the relief pilot returned to the cockpit and used satcom to contact dispatch and the maintenance controller. We followed the fuel dumping checklist landing distance tables and advised passenger and flight attendants returning to sbgr for a normal approach and landing. Advised sbgr operations of need for the fire trucks due to hot brakes and overweight landing. The landing was normal, the brakes were hot by the time we reached the gate. No fire truck responded.

Original NASA ASRS Text

Title: B767-300 CREW LOST CABIN PRESSURIZATION AND MADE AN EMER DSCNT IN SBBS CLASS A.

Narrative: APPROX 23 MINS INTO THE FLT AT CRUISE THE CABIN ALT HORN SOUNDED. WE DONNED THE OXYGEN MASK, DECLARED AN EMER AND ACCOMPLISHED THE QRC: CABIN ALT AND EMER DSCNT. WE DSNDED TO FL100 AND RETURNED TO SBGR. AT FL100 THE RELIEF PLT RETURNED TO THE COCKPIT AND USED SATCOM TO CONTACT DISPATCH AND THE MAINT CTLR. WE FOLLOWED THE FUEL DUMPING CHKLIST LNDG DISTANCE TABLES AND ADVISED PAX AND FLT ATTENDANTS RETURNING TO SBGR FOR A NORMAL APCH AND LNDG. ADVISED SBGR OPS OF NEED FOR THE FIRE TRUCKS DUE TO HOT BRAKES AND OVERWT LNDG. THE LNDG WAS NORMAL, THE BRAKES WERE HOT BY THE TIME WE REACHED THE GATE. NO FIRE TRUCK RESPONDED.

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.