Loss of pressurization resulted in descent to lower altitude. Regained manual control and retruned t...

Attributes
ACN	82612
Time
Date	198802
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bfm
State Reference	AL
Altitude	msl bound lower : 13000 msl bound upper : 33000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 9000
ASRS Report	82612
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	aircraft : equipment problem dissipated controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Partial loss of cabin pressure, but enough to drop mask. Received clearance to descended to 13000' and regained control of press in manual. We were able climb back to FL270 and continue to fll. At fll we received mx. Cabin never went above 12000'. No complaints from passenger. Callback conversation with reporter revealed the following: maintenance found a bracket loose and tightened thinking that would solve the problem. Reporter found out later problem was in a water separator and possible icing on the outflow valve. Could not explain the oxygen masks coming out so early. Advised the aircraft had been operating in light icing conditions at the time of both failures. Second flight was primarily a ferry with no passenger on board.

Original NASA ASRS Text

Title: LOSS OF PRESSURIZATION RESULTED IN DESCENT TO LOWER ALT. REGAINED MANUAL CTL AND RETRUNED TO FL270.

Narrative: PARTIAL LOSS OF CABIN PRESSURE, BUT ENOUGH TO DROP MASK. RECEIVED CLRNC TO DESCENDED TO 13000' AND REGAINED CTL OF PRESS IN MANUAL. WE WERE ABLE CLB BACK TO FL270 AND CONTINUE TO FLL. AT FLL WE RECEIVED MX. CABIN NEVER WENT ABOVE 12000'. NO COMPLAINTS FROM PAX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: MAINT FOUND A BRACKET LOOSE AND TIGHTENED THINKING THAT WOULD SOLVE THE PROB. RPTR FOUND OUT LATER PROB WAS IN A WATER SEPARATOR AND POSSIBLE ICING ON THE OUTFLOW VALVE. COULD NOT EXPLAIN THE OXYGEN MASKS COMING OUT SO EARLY. ADVISED THE ACFT HAD BEEN OPERATING IN LIGHT ICING CONDITIONS AT THE TIME OF BOTH FAILURES. SECOND FLT WAS PRIMARILY A FERRY WITH NO PAX ON BOARD.

Data retrieved from NASA's ASRS site as of August 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.

Loss of pressurization resulted in descent to lower altitude. Regained manual control and retruned to FL270.