Small transport made an emergency descent when cabin pressurization was lost.

Attributes
ACN	243973
Time
Date	199306
Day	Thu
Place
Locale Reference	atc facility : evv
State Reference	IN
Altitude	msl bound lower : 22000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	general aviation : corporate
Make Model Name	Small Transport
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 73 flight time total : 2808 flight time type : 73
ASRS Report	243973
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Lost complete pressurization while cruising at 22000 ft. I immediately executed an emergency descent from 22000 ft while transmitting the following on the center frequency: 'break break break lost all pressurization diving to lower altitude, lost all pressurization diving to lower altitude out.' the malfunction was caused by a bad maximum heat system. Had to land in order to recycle the total system as pressurization was not regained in-flight. It acted as if I had shut off both bleed air valves at the engine! According to center no other traffic was disrupted below and there was no incident. After landing at evansville, in, the system was regained and we continued north our trip without further incident.

Original NASA ASRS Text

Title: SMT MADE AN EMER DSCNT WHEN CABIN PRESSURIZATION WAS LOST.

Narrative: LOST COMPLETE PRESSURIZATION WHILE CRUISING AT 22000 FT. I IMMEDIATELY EXECUTED AN EMER DSCNT FROM 22000 FT WHILE XMITTING THE FOLLOWING ON THE CTR FREQ: 'BREAK BREAK BREAK LOST ALL PRESSURIZATION DIVING TO LOWER ALT, LOST ALL PRESSURIZATION DIVING TO LOWER ALT OUT.' THE MALFUNCTION WAS CAUSED BY A BAD MAX HEAT SYS. HAD TO LAND IN ORDER TO RECYCLE THE TOTAL SYS AS PRESSURIZATION WAS NOT REGAINED INFLT. IT ACTED AS IF I HAD SHUT OFF BOTH BLEED AIR VALVES AT THE ENG! ACCORDING TO CTR NO OTHER TFC WAS DISRUPTED BELOW AND THERE WAS NO INCIDENT. AFTER LNDG AT EVANSVILLE, IN, THE SYS WAS REGAINED AND WE CONTINUED N OUR TRIP WITHOUT FURTHER 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.