Aircraft pressurization failed. Flight crew requested and made an emergency descent. No further prob...

Attributes
ACN	206547
Time
Date	199203
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : tnv
State Reference	TX
Altitude	agl bound lower : 10000 agl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	enroute airway : zhu
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 93 flight time total : 9700 flight time type : 2500
ASRS Report	206424
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 200
ASRS Report	206547
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Approximately 3-5 mins after level off the cabin altitude warning horn came on. Oxygen masks were put on and the first officer attempted to lower the cabin pressure. The automatic/standby/manual modes were ineffective. The cabin pressure was approximately 11000 ft and steady. I requested a lower altitude and was given FL210. I then requested an emergency descent to 10000 ft. We were immediately cleared to 10000 ft and we began an emergency descent. The cabin was stabilized at 10000 ft. No other special handling was needed from ATC. The flight was continued to houston hobby with a normal approach and landing.

Original NASA ASRS Text

Title: ACFT PRESSURIZATION FAILED. FLC REQUESTED AND MADE AN EMER DSCNT. NO FURTHER PROBLEMS.

Narrative: APPROX 3-5 MINS AFTER LEVEL OFF THE CABIN ALT WARNING HORN CAME ON. OXYGEN MASKS WERE PUT ON AND THE FO ATTEMPTED TO LOWER THE CABIN PRESSURE. THE AUTOMATIC/STANDBY/MANUAL MODES WERE INEFFECTIVE. THE CABIN PRESSURE WAS APPROX 11000 FT AND STEADY. I REQUESTED A LOWER ALT AND WAS GIVEN FL210. I THEN REQUESTED AN EMER DSCNT TO 10000 FT. WE WERE IMMEDIATELY CLRED TO 10000 FT AND WE BEGAN AN EMER DSCNT. THE CABIN WAS STABILIZED AT 10000 FT. NO OTHER SPECIAL HANDLING WAS NEEDED FROM ATC. THE FLT WAS CONTINUED TO HOUSTON HOBBY WITH A NORMAL APCH AND LNDG.

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.

Aircraft pressurization failed. Flight crew requested and made an emergency descent. No further problems.