Cpr light transport has loss of cabin pressure. Emergency descent.

Attributes
ACN	247549
Time
Date	199307
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bna
State Reference	TN
Altitude	msl bound lower : 39000 msl bound upper : 39000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 100 flight time total : 7000 flight time type : 3000
ASRS Report	247549
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

I had just received a climb from ZME from FL350 to FL390. Upon just reaching FL390 I experienced a total loss of cabin pressure and had to execute an emergency descent. We descended to 14000 and received a vector from center to nashville for repairs. Upon inspection of the aircraft, we found a broken water ejector line on the air-cycle machine which caused the filter in the unit to freeze up, cutting off the airflow to the cabin. In addition, our emergency pressurization valve had failed, leaving us with no alternative but to descend rapidly. We replaced the water ejector fitting and the emergency pressurization valve at nashville and continued on to okc the next day without incident.

Original NASA ASRS Text

Title: CPR LTT HAS LOSS OF CABIN PRESSURE. EMER DSCNT.

Narrative: I HAD JUST RECEIVED A CLB FROM ZME FROM FL350 TO FL390. UPON JUST REACHING FL390 I EXPERIENCED A TOTAL LOSS OF CABIN PRESSURE AND HAD TO EXECUTE AN EMER DSCNT. WE DSNDED TO 14000 AND RECEIVED A VECTOR FROM CTR TO NASHVILLE FOR REPAIRS. UPON INSPECTION OF THE ACFT, WE FOUND A BROKEN WATER EJECTOR LINE ON THE AIR-CYCLE MACHINE WHICH CAUSED THE FILTER IN THE UNIT TO FREEZE UP, CUTTING OFF THE AIRFLOW TO THE CABIN. IN ADDITION, OUR EMER PRESSURIZATION VALVE HAD FAILED, LEAVING US WITH NO ALTERNATIVE BUT TO DSND RAPIDLY. WE REPLACED THE WATER EJECTOR FITTING AND THE EMER PRESSURIZATION VALVE AT NASHVILLE AND CONTINUED ON TO OKC THE NEXT DAY WITHOUT INCIDENT.

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.