<< >> NASA ASRS Report 989512, January 2012

A GLF4 flight crew initiated an emergency descent; declared an emergency and diverted to a nearby airport following a loss of cabin pressurization.

Attributes
ACN	989512
Time
Date	201201
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	Gulfstream IV / G350 / G450
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Climbing through FL400 to cruising altitude of FL430 cabin pressurization became erratic. Red cas message illuminated (cabin pressure) cabin altitude was 10;500 and climbing at 1;500 ft a minute. Stopped climb and donned the oxygen masks and turned on the seatbelt and no smoking signs. A quick assessment was done and an emergency descent was initiated. [We] followed the emergency descent checklist with a left turn to clear the airway. Contacted ATC and declared an emergency and requested 10;000 ft altitude. Once level at 10;000 ft checked the aircraft; the flight attendant; and passengers. We then diverted to a suitable airport.

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Original NASA ASRS Text

Title: A GLF4 flight crew initiated an emergency descent; declared an emergency and diverted to a nearby airport following a loss of cabin pressurization.

Narrative: Climbing through FL400 to cruising altitude of FL430 cabin pressurization became erratic. Red CAS message illuminated (cabin pressure) cabin altitude was 10;500 and climbing at 1;500 FT a minute. Stopped climb and donned the oxygen masks and turned on the seatbelt and no smoking signs. A quick assessment was done and an emergency descent was initiated. [We] followed the emergency descent checklist with a left turn to clear the airway. Contacted ATC and declared an emergency and requested 10;000 FT altitude. Once level at 10;000 FT checked the aircraft; the flight attendant; and passengers. We then diverted to a suitable airport.

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.