Narrative:

During an initial descend leaving FL390 and passing through FL370 en route to our destination, we experienced a rapid loss of pressurization in the cabin. As per emergency procedures we immediately donned our oxygen masks and increased our descent rate to quickly reach a safe altitude. We made several xmissions to ATC, but had difficulty hearing ATC's responses back to us due to the excessive cockpit noise. In addition the ruptured door seal noise created even further feedback through our headsets almost obliterating our ability to hear ATC's xmissions. As we approached a safe altitude full 2-WAY radio contact was resumed and a safe and normal approach and landing were achieved. Callback conversation with reporter revealed the following information: the reporter stated the cause of the loss of cabin pressure was the forward entrance door pressure seal failure. The reporter said the excessive noise from the pressure leak made communication with ATC almost impossible. The reporter stated the airplane had no recent history of door seal leakage.

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Original NASA ASRS Text

Title: A CESSNA CITATION CJ1 IN DSCNT AT FL370 DECLARED AN EMER AND DIVERTED DUE TO SUDDEN LOSS OF PRESSURIZATION. NOISE IMPAIRED COM.

Narrative: DURING AN INITIAL DSND LEAVING FL390 AND PASSING THROUGH FL370 ENRTE TO OUR DEST, WE EXPERIENCED A RAPID LOSS OF PRESSURIZATION IN THE CABIN. AS PER EMER PROCS WE IMMEDIATELY DONNED OUR OXYGEN MASKS AND INCREASED OUR DSCNT RATE TO QUICKLY REACH A SAFE ALT. WE MADE SEVERAL XMISSIONS TO ATC, BUT HAD DIFFICULTY HEARING ATC'S RESPONSES BACK TO US DUE TO THE EXCESSIVE COCKPIT NOISE. IN ADDITION THE RUPTURED DOOR SEAL NOISE CREATED EVEN FURTHER FEEDBACK THROUGH OUR HEADSETS ALMOST OBLITERATING OUR ABILITY TO HEAR ATC'S XMISSIONS. AS WE APCHED A SAFE ALT FULL 2-WAY RADIO CONTACT WAS RESUMED AND A SAFE AND NORMAL APCH AND LNDG WERE ACHIEVED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE LOSS OF CABIN PRESSURE WAS THE FORWARD ENTRANCE DOOR PRESSURE SEAL FAILURE. THE RPTR SAID THE EXCESSIVE NOISE FROM THE PRESSURE LEAK MADE COM WITH ATC ALMOST IMPOSSIBLE. THE RPTR STATED THE AIRPLANE HAD NO RECENT HISTORY OF DOOR SEAL LEAKAGE.

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.