B727-200 experiences loss of pressurization on climb out.

Attributes
ACN	676012
Time
Date	200510
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 0 flight time total : 2200 flight time type : 0
ASRS Report	676012
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : cabin alt indicator
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Climbing through FL290; I alerted the captain that the cabin altitude was climbing through 9000-9500 ft. The captain and I began running communication procedure; unscheduled cabin pressure change; while first officer continued to fly the aircraft. We were unable to control the cabin using this procedure. When the altitude reached 10000 ft; the cabin warning horn sounded. We immediately placed our oxygen masks on and shortly after; the captain declared an emergency with center. First officer began an emergency descent and I accomplished the rapid descent checklist. Center gave us an immediate vector back to ZZZ and cleared us to 11000 ft. During our descent; the cabin altitude reached 14000 ft and the cabin oxygen masks were deployed. After descending through 12000 ft; the captain made a PA to the passenger that it was now safe to discontinue the use of oxygen. After descending to 10000 ft; the crew terminated the use of oxygen. The captain called the lead flight attendant into the flight deck and briefed her on the situation. We dumped approximately 12000 pounds of fuel and communicated with dispatch and maintenance control advising them of our situation. The flight continued to ZZZ and landed uneventfully.

Original NASA ASRS Text

Title: B727-200 EXPERIENCES LOSS OF PRESSURIZATION ON CLBOUT.

Narrative: CLBING THROUGH FL290; I ALERTED THE CAPT THAT THE CABIN ALT WAS CLBING THROUGH 9000-9500 FT. THE CAPT AND I BEGAN RUNNING COM PROC; UNSCHEDULED CABIN PRESSURE CHANGE; WHILE FO CONTINUED TO FLY THE ACFT. WE WERE UNABLE TO CTL THE CABIN USING THIS PROC. WHEN THE ALT REACHED 10000 FT; THE CABIN WARNING HORN SOUNDED. WE IMMEDIATELY PLACED OUR OXYGEN MASKS ON AND SHORTLY AFTER; THE CAPT DECLARED AN EMER WITH CTR. FO BEGAN AN EMER DSCNT AND I ACCOMPLISHED THE RAPID DSCNT CHKLIST. CTR GAVE US AN IMMEDIATE VECTOR BACK TO ZZZ AND CLRED US TO 11000 FT. DURING OUR DSCNT; THE CABIN ALT REACHED 14000 FT AND THE CABIN OXYGEN MASKS WERE DEPLOYED. AFTER DSNDING THROUGH 12000 FT; THE CAPT MADE A PA TO THE PAX THAT IT WAS NOW SAFE TO DISCONTINUE THE USE OF OXYGEN. AFTER DSNDING TO 10000 FT; THE CREW TERMINATED THE USE OF OXYGEN. THE CAPT CALLED THE LEAD FLT ATTENDANT INTO THE FLT DECK AND BRIEFED HER ON THE SITUATION. WE DUMPED APPROX 12000 LBS OF FUEL AND COMMUNICATED WITH DISPATCH AND MAINT CTL ADVISING THEM OF OUR SITUATION. THE FLT CONTINUED TO ZZZ AND LANDED UNEVENTFULLY.

Data retrieved from NASA's ASRS site as of January 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.