B757-200 lost cabin pressurization. Emergency descent was initiated and flight diverted.

Attributes
ACN	769024
Time
Date	200801
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	msl single value : 34000
Environment
Weather Elements	Rain
Aircraft 1
Controlling Facilities	artcc : zzzz.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
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
ASRS Report	769024
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	769025
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : eicas other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Normal departure and we were cleared on course. ATC cleared us to FL340. Aircraft restr to FL350 maximum because left bleed off and left pack off as per MEL. About 10 mins after leveloff; master warning activated along with cabin altitude alert on forward panel. Cabin altitude approximately 11000 ft. We immediately donned oxygen masks and did a communication check. We asked for lower from ATC and started a rapid descent to 10000 ft. We asked for and were cleared direct to ZZZ while completing the red box procedure for rapid depressurization and emergency descent. During descent; passing 17000 ft; we started the APU and put the left pack on line (per MEL). At this point; flight attendants reported some smoke in the cabin. We only smelled a light pungent odor in the cockpit but went ahead and completed the red box for cabin smoke. Before we completed the checklist they called to say the smoke had cleared. Clearance was received at this point to intercept final for runway 11 and cleared visual. We landed approximately 20 mins later and stopped on the runway so crash fire rescue equipment could examine the exterior to make sure there was no smoke coming from the aircraft. They determined that there was no smoke or fire; so we parked the aircraft and deplaned the passenger without further incident.

Original NASA ASRS Text

Title: B757-200 LOST CABIN PRESSURIZATION. EMER DESCENT WAS INITIATED AND FLT DIVERTED.

Narrative: NORMAL DEP AND WE WERE CLRED ON COURSE. ATC CLRED US TO FL340. ACFT RESTR TO FL350 MAX BECAUSE L BLEED OFF AND L PACK OFF AS PER MEL. ABOUT 10 MINS AFTER LEVELOFF; MASTER WARNING ACTIVATED ALONG WITH CABIN ALT ALERT ON FORWARD PANEL. CABIN ALT APPROX 11000 FT. WE IMMEDIATELY DONNED OXYGEN MASKS AND DID A COM CHK. WE ASKED FOR LOWER FROM ATC AND STARTED A RAPID DSCNT TO 10000 FT. WE ASKED FOR AND WERE CLRED DIRECT TO ZZZ WHILE COMPLETING THE RED BOX PROC FOR RAPID DEPRESSURIZATION AND EMER DSCNT. DURING DSCNT; PASSING 17000 FT; WE STARTED THE APU AND PUT THE L PACK ON LINE (PER MEL). AT THIS POINT; FLT ATTENDANTS RPTED SOME SMOKE IN THE CABIN. WE ONLY SMELLED A LIGHT PUNGENT ODOR IN THE COCKPIT BUT WENT AHEAD AND COMPLETED THE RED BOX FOR CABIN SMOKE. BEFORE WE COMPLETED THE CHKLIST THEY CALLED TO SAY THE SMOKE HAD CLRED. CLRNC WAS RECEIVED AT THIS POINT TO INTERCEPT FINAL FOR RWY 11 AND CLRED VISUAL. WE LANDED APPROX 20 MINS LATER AND STOPPED ON THE RWY SO CFR COULD EXAMINE THE EXTERIOR TO MAKE SURE THERE WAS NO SMOKE COMING FROM THE ACFT. THEY DETERMINED THAT THERE WAS NO SMOKE OR FIRE; SO WE PARKED THE ACFT AND DEPLANED THE PAX WITHOUT FURTHER INCIDENT.

Data retrieved from NASA's ASRS site as of May 2009 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.