Narrative:

Climbing out on departure through FL280; the cabin altitude warning horn went off. We donned oxygen masks; established communication; and ran the abnormal pressurization checklist. I asked for a descent from center; telling them we had a pressurization problem. We got to FL250 and then had to get a vector until we could get further descent. I tried to contact dispatch to see if they wanted us to return to our departure airport. It took several minutes to get their answer. As we were only about 100 miles out; I asked to return to our departure airport; and as we were getting vectored back; dispatch said they wanted us to continue since the masks had not dropped and no emergency was declared. We asked center for vectors back to our destination and they turned us back west. We continued to our destination at 10;000 ft; and arrived uneventfully with 5;400 pounds of fuel. I checked with the flight attendants en route and they reported nothing abnormal in the cabin.

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Original NASA ASRS Text

Title: B737-500 flight crew had a Cabin Altitude Warning horn activation during climb out at FL290. Flight crew responded as per the checklist.

Narrative: Climbing out on departure through FL280; the Cabin Altitude Warning horn went off. We donned oxygen masks; established communication; and ran the Abnormal Pressurization Checklist. I asked for a descent from Center; telling them we had a pressurization problem. We got to FL250 and then had to get a vector until we could get further descent. I tried to contact Dispatch to see if they wanted us to return to our departure airport. It took several minutes to get their answer. As we were only about 100 miles out; I asked to return to our departure airport; and as we were getting vectored back; Dispatch said they wanted us to continue since the masks had not dropped and no emergency was declared. We asked Center for vectors back to our destination and they turned us back west. We continued to our destination at 10;000 FT; and arrived uneventfully with 5;400 LBS of fuel. I checked with the flight attendants en route and they reported nothing abnormal in the cabin.

Data retrieved from NASA's ASRS site as of July 2013 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.