Narrative:

At FL240 the pressurization suddenly started climbing at 2;000 ft per minute. The cabin altitude was already stabilized at the destination field elevation when this occurred. We descended to 14;000 ft with ATC compliance and did not declare an emergency and did not execute an emergency descent. After calling the company; we were re-released through dispatch to take the plane to ZZZ for maintenance. After speaking with the mechanic there; he told me to be as specific as possible in the write up. I included the fact the when we started engines there was a pressure spike. This spike was a climbing cabin vsi of a few hundred feet as air stopped entering the cabin during the start cycle. I also notice that during the thrust reverser test that the cabin vsi spiked down a few hundred feet as power was added to increase taxi speed for the test. On takeoff the cabin vsi went up; then down and then stabilized. It was my understanding that pressure spikes less than 2;500 ft per minute were allowed by the cessna CE750 aircraft manual. After reviewing the manual I am unclear as to when a spike is acceptable and if there is any limit associated with it. I don't know that this scenario can be avoided in the future as this information is not covered in the recurrent training. It is another area where the CE750 aircraft manual can be misinterpreted because there is no wording that states this limitation is only for the situations listed.

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Original NASA ASRS Text

Title: CE750 Captain experiences cabin pressurization anomaly at FL240 during a ferry flight and diverts for maintenance at the request of the Company.

Narrative: At FL240 the pressurization suddenly started climbing at 2;000 FT per minute. The cabin altitude was already stabilized at the destination field elevation when this occurred. We descended to 14;000 FT with ATC compliance and did not declare an emergency and did not execute an emergency descent. After calling the company; we were re-released through Dispatch to take the plane to ZZZ for maintenance. After speaking with the mechanic there; he told me to be as specific as possible in the write up. I included the fact the when we started engines there was a pressure spike. This spike was a climbing cabin VSI of a few hundred feet as air stopped entering the cabin during the start cycle. I also notice that during the thrust reverser test that the cabin VSI spiked down a few hundred feet as power was added to increase taxi speed for the test. On takeoff the cabin VSI went up; then down and then stabilized. It was my understanding that pressure spikes less than 2;500 FT per minute were allowed by the Cessna CE750 Aircraft Manual. After reviewing the manual I am unclear as to when a spike is acceptable and if there is any limit associated with it. I don't know that this scenario can be avoided in the future as this information is not covered in the recurrent training. It is another area where the CE750 Aircraft Manual can be misinterpreted because there is no wording that states this limitation is ONLY for the situations listed.

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.