Narrative:

This was the second leg of our day. The aircraft had two pressurization write ups. One called for the right pack to be operated in the off position at all times; which it was. The other writeup called for the pressurization controller to be operated in position 1 at all times as there was a problem operating in position 2. About 150 miles east of our destination; we experienced a cabin altitude EICAS and associated master warning alarm at FL340. The cabin altimeter read 10000' and the crew felt little or no pressure change in our ears. The captain (PF) and first officer (PNF) put on our oxygen masks; and the first officer read the cabin altitude qrc and then the emergency descent qrc. All items were accomplished with the exception of 'transponder 7700' and 'declare an emergency' as we were in communication with ATC. Our first call to ATC was 'center; we need a descent'. We were cleared to fl 200 as we were nearly at our normal top of descent point. Shortly after we called 'center; we have a pressurization problem; we need 10000'. We were given 'turn left 20 degrees; cleared to 10000'.' traffic was very light due to the late hour. At 10000' MSL the cabin altitude alarm ceased; the masks were stowed and the cabin was now at 8000'. We then coordinated with ATC. They asked us if we 'wanted to declare an emergency or is 10000' direct the airport ok' I said that we had had a pressurization problem and 'no thank you; we are ops normal now at 10000'. We proceeded direct for an uneventful visual approach and landing. The flight attendants were also called and we reported that all was ok; that we were now at a lower altitude and to expect a normal landing in 20 min. Communication while on the O2 mask was difficult. Although the transmissions were being received by ATC; the capt (PNF) could not hear the outgoing transmissions made by me and was repeating them over the radio. I had to take the mask away from my face to tell the captain 'I'll keep the radio. You keep flying'. Also the communication to the flight attendants was poor. My first transmission to them was unreadable. So I then had to yell into my mask 'finish your service and situation down' in order to be heard. The tone of this call caused undue alarm for the flight attendants.

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Original NASA ASRS Text

Title: Dispatched with multiple pressurization system deferrals; B757-200 suffered a slow loss of pressurization and had to descend and complete the flight at or below 10000 feet.

Narrative: This was the second leg of our day. The aircraft had two pressurization write ups. One called for the RIGHT PACK to be operated in the OFF position at all times; which it was. The other writeup called for the pressurization controller to be operated in position 1 at all times as there was a problem operating in position 2. About 150 miles east of our destination; we experienced a CABIN ALT EICAS and associated master warning alarm at FL340. The cabin altimeter read 10000' and the crew felt little or no pressure change in our ears. The Captain (PF) and First Officer (PNF) put on our oxygen masks; and the First Officer read the CABIN ALT QRC and then the Emergency Descent QRC. All items were accomplished with the exception of 'transponder 7700' and 'Declare an Emergency' as we were in communication with ATC. Our first call to ATC was 'Center; we need a descent'. We were cleared to FL 200 as we were nearly at our normal top of descent point. Shortly after we called 'Center; we have a pressurization problem; we need 10000'. We were given 'Turn left 20 degrees; cleared to 10000'.' Traffic was very light due to the late hour. At 10000' MSL the cabin ALT alarm ceased; the masks were stowed and the cabin was now at 8000'. We then coordinated with ATC. They asked us if we 'wanted to declare an emergency or is 10000' direct the airport OK' I said that we had had a pressurization problem and 'no thank you; we are ops normal now at 10000'. We proceeded direct for an uneventful visual approach and landing. The flight attendants were also called and we reported that all was OK; that we were now at a lower altitude and to expect a normal landing in 20 min. Communication while on the O2 mask was difficult. Although the transmissions were being received by ATC; the Capt (PNF) could not hear the outgoing transmissions made by me and was repeating them over the radio. I had to take the mask away from my face to tell the Captain 'I'll keep the radio. You keep flying'. Also the communication to the flight attendants was poor. My first transmission to them was unreadable. So I then had to yell into my mask 'FINISH YOUR SERVICE AND SIT DOWN' in order to be heard. The tone of this call caused undue alarm for the flight attendants.

Data retrieved from NASA's ASRS site as of April 2012 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.