BE02 crew lost cabin pressurization.

Attributes
ACN	435511
Time
Date	199904
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : slk.vor
State Reference	NY
Altitude	msl single value : 20000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 119
Flight Phase	cruise : level
Route In Use	enroute airway : ns.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 3000
ASRS Report	435511
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : landed in emergency condition other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

We just leveled off at FL200 and started to configure for cruise flight when we heard a loud popping sound and the rushing of air. We declared an emergency with ZBW as we started the emergency procedures for cabin decompression and an emergency descent to 10000 ft. Upon reaching 10000 ft, we proceeded to plb without further incident. Callback conversation with reporter revealed the following information: crew was flying a beech 1900D aircraft. This was the second emergency descent the aircraft had in a week. The main passenger entrance door seal was found split and caused the pressure loss. The next 2 door seals installed by maintenance also failed. Maintenance attributes these problems to a small dent in the aircraft door sill. The crew changed aircraft at that point and does not know any further information.

Original NASA ASRS Text

Title: BE02 CREW LOST CABIN PRESSURIZATION.

Narrative: WE JUST LEVELED OFF AT FL200 AND STARTED TO CONFIGURE FOR CRUISE FLT WHEN WE HEARD A LOUD POPPING SOUND AND THE RUSHING OF AIR. WE DECLARED AN EMER WITH ZBW AS WE STARTED THE EMER PROCS FOR CABIN DECOMPRESSION AND AN EMER DSCNT TO 10000 FT. UPON REACHING 10000 FT, WE PROCEEDED TO PLB WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CREW WAS FLYING A BEECH 1900D ACFT. THIS WAS THE SECOND EMER DSCNT THE ACFT HAD IN A WK. THE MAIN PAX ENTRANCE DOOR SEAL WAS FOUND SPLIT AND CAUSED THE PRESSURE LOSS. THE NEXT 2 DOOR SEALS INSTALLED BY MAINT ALSO FAILED. MAINT ATTRIBUTES THESE PROBS TO A SMALL DENT IN THE ACFT DOOR SILL. THE CREW CHANGED ACFT AT THAT POINT AND DOES NOT KNOW ANY FURTHER INFO.

Data retrieved from NASA's ASRS site as of July 2007 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.