<< >> NASA ASRS Report 769463, January 2008

Cabin door seal failed on a G iv and the cabin was losing pressure. Flight crew initiated an emergency descent and diverted.

Attributes
ACN	769463
Time
Date	200801
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 43000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 8000 flight time type : 2000
ASRS Report	769463
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While at cruise altitude; the forward door seal failed and we did a rapid descent down to 15000 ft. The cabin stabilized; and we diverted to ZZZ. Callback conversation with reporter revealed the following information: the reporter stated that the cabin door is not of the 'plug' type. They could hear the door leaking and immediately checked to discover the cabin was climbing. An emergency was declared to obtain an immediate descent clearance. Inspection revealed a tear on the seal.

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Original NASA ASRS Text

Title: CABIN DOOR SEAL FAILED ON A G IV AND THE CABIN WAS LOSING PRESSURE. FLT CREW INITIATED AN EMER DESCENT AND DIVERTED.

Narrative: WHILE AT CRUISE ALT; THE FORWARD DOOR SEAL FAILED AND WE DID A RAPID DSCNT DOWN TO 15000 FT. THE CABIN STABILIZED; AND WE DIVERTED TO ZZZ. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT THE CABIN DOOR IS NOT OF THE 'PLUG' TYPE. THEY COULD HEAR THE DOOR LEAKING AND IMMEDIATELY CHECKED TO DISCOVER THE CABIN WAS CLIMBING. AN EMER WAS DECLARED TO OBTAIN AN IMMEDIATE DESCENT CLRNC. INSPECTION REVEALED A TEAR ON THE SEAL.

Data retrieved from NASA's ASRS site as of May 2009 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.