<< >> NASA ASRS Report 1054167, December 2012

CE525 first officer experiences pressurization anomalies climbing through FL180 and the climb is stopped and a descent is initiated with ATC concurrence. The pressurization seems to function normally at 10;000 ft and the crew climbs to planned altitude and continues to destination. Maintenance can find no discrepancies.

Attributes
ACN	1054167
Time
Date	201212
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citationjet (C525/C526) - CJ I / II / III / IV
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 3000 Flight Crew Type 30
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Other / Unknown

Narrative:

On climb out during checklist passing FL180 I (pilot not flying) noticed the pressurization was not working correctly. I informed the captain (pilot flying) of the problem and we both agreed the cabin was climbing rapidly and was nearing 10;000 ft cabin altitude. I immediately asked ATC for a level off (at this time we were approaching FL200) followed by requesting a descent to 10;000 ft. ATC issued us a hand off in response and I told them we needed an emergency descent to 10;000 ft immediately. Controller asked us nature of problem to which I told them it was a pressurization issue. They cleared us to 10;000 ft and we performed an emergency descent. No emergency was declared and we confirmed with ATC that they did not declare one for us nor [gave us] any indication of one being filed. At 10;000 ft cabin became controllable and everything worked fine. We elected to continue on flight plan and step climb slowly monitoring system. Maintenance inspected the plane and found no discrepancies.

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Original NASA ASRS Text

Title: CE525 First Officer experiences pressurization anomalies climbing through FL180 and the climb is stopped and a descent is initiated with ATC concurrence. The pressurization seems to function normally at 10;000 FT and the crew climbs to planned altitude and continues to destination. Maintenance can find no discrepancies.

Narrative: On climb out during checklist passing FL180 I (pilot not flying) noticed the pressurization was not working correctly. I informed the Captain (pilot flying) of the problem and we both agreed the cabin was climbing rapidly and was nearing 10;000 FT cabin altitude. I immediately asked ATC for a level off (at this time we were approaching FL200) followed by requesting a descent to 10;000 FT. ATC issued us a hand off in response and I told them we needed an emergency descent to 10;000 FT immediately. Controller asked us nature of problem to which I told them it was a pressurization issue. They cleared us to 10;000 FT and we performed an emergency descent. No emergency was declared and we confirmed with ATC that they did not declare one for us nor [gave us] any indication of one being filed. At 10;000 FT cabin became controllable and everything worked fine. We elected to continue on flight plan and step climb slowly monitoring system. Maintenance inspected the plane and found no discrepancies.

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.