A CE560 flight crew performed and emergency descent and diverted to a nearby airport when the cabin ...

Attributes
ACN	950847
Time
Date	201105
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Indicating and Warning - Air Conditioning and Press.
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

We decided to leave our filed altitude of FL410 in search of smoother air. Leveling off at FL450 the 'cabin alt' light illuminated followed by the 'master warning' light. There were no other indications of a loss of cabin pressure. We immediately initiated the memory items for an emergency descent; performed the checklist and contacted ATC with our emergency. Since we were overhead of ZZZ and had been in there before; we both agreed it was a suitable place to land. The pressurization system operated normally during the entire descent. We got vectored around for an ILS to the runway and landed uneventfully.

Original NASA ASRS Text

Title: A CE560 flight crew performed and emergency descent and diverted to a nearby airport when the Cabin Altitude and Master Warning lights illuminated at FL450. The pressurization system appeared to be working normally throughout the event.

Narrative: We decided to leave our filed altitude of FL410 in search of smoother air. Leveling off at FL450 the 'cabin alt' light illuminated followed by the 'master warning' light. There were no other indications of a loss of cabin pressure. We immediately initiated the memory items for an emergency descent; performed the checklist and contacted ATC with our emergency. Since we were overhead of ZZZ and had been in there before; we both agreed it was a suitable place to land. The pressurization system operated normally during the entire descent. We got vectored around for an ILS to the runway and landed uneventfully.

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.

A CE560 flight crew performed and emergency descent and diverted to a nearby airport when the cabin altitude and master warning lights illuminated at FL450. The pressurization system appeared to be working normally throughout the event.