<< >> NASA ASRS Report 1342991, March 2016

A falcon 50 flight crew reported an aircraft over-pressurization condition. The aircrew depressurized the cabin and landed.

Attributes
ACN	1342991
Time
Date	201603
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Falcon 50
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 35 Flight Crew Total 12500 Flight Crew Type 2400
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 8000 Flight Crew Type 300
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Other / Unknown

Narrative:

We were in cruise flight at FL340. A sudden dramatic change of cabin pressurization occurred causing a major over pressurization of the cabin. Crew completed all procedures to regain control of cabin pressure to no avail. With the only option left to prevent further over pressurizing of the cabin; emergency dumping; I initiated emergency descent to 10;000 feet. Center was exceptionally helpful.post maintenance trouble shooting was performed. A crack static line connecting the electromechanical outflow valve and mechanical outflow valve was found. This was cause of all of our pressure problems.

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Original NASA ASRS Text

Title: A Falcon 50 flight crew reported an aircraft over-pressurization condition. The aircrew depressurized the cabin and landed.

Narrative: We were in cruise flight at FL340. A sudden dramatic change of cabin pressurization occurred causing a major over pressurization of the cabin. Crew completed all procedures to regain control of cabin pressure to no avail. With the only option left to prevent further over pressurizing of the cabin; emergency dumping; I initiated emergency descent to 10;000 feet. Center was exceptionally helpful.Post maintenance trouble shooting was performed. A crack static line connecting the electromechanical outflow valve and mechanical outflow valve was found. This was cause of all of our pressure problems.

Data retrieved from NASA's ASRS site 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.