A TBM850's pressurization control failed in cruise at 26;000 ft so an emergency was declared and an ...

Narrative:

We lost pressurization because the bleed air/air conditioning environmental system stopped functioning properly. We declared an emergency and started an expedited decent. The radios also seemed to be not functioning properly and had trouble communicating with ATC we finally established communication at about 14;000 ft decided to land at a nearby airport landed without incident and called factory service center. [We] told them that the system seemed to come back on line at about 8;000 ft. They told us that the computer probably reset itself and we should take off and continue our flight. It did work properly for the first 30 to 40 minutes and then the system failed again. Again we had radio problems at the same time. We did another expedited decent down to 12;000 ft and again the radio problem went away and we were able to keep communication going most of the way down and on to our new destination to get to a service center. We again had some radio problems while on the arrival but we were able to re-establish communication with the tower and landed without incident.

Original NASA ASRS Text

Title: A TBM850's pressurization control failed in cruise at 26;000 FT so an emergency was declared and an expedited descent begun but the pilot had VHF radio problems which seem to lessen at 14;000 FT and pressurization reset at at about 8;000 FT but the diverts to a nearby airport continued.

Narrative: We lost pressurization because the bleed air/air conditioning environmental system stopped functioning properly. We declared an emergency and started an expedited decent. The radios also seemed to be not functioning properly and had trouble communicating with ATC we finally established communication at about 14;000 FT decided to land at a nearby airport landed without incident and called factory service center. [We] told them that the system seemed to come back on line at about 8;000 FT. They told us that the computer probably reset itself and we should take off and continue our flight. It did work properly for the first 30 to 40 minutes and then the system failed again. Again we had radio problems at the same time. We did another expedited decent down to 12;000 FT and again the radio problem went away and we were able to keep communication going most of the way down and on to our new destination to get to a service center. We again had some radio problems while on the arrival but we were able to re-establish communication with the Tower and landed without incident.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	936307
Time
Date	201103
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	TBM 700/TBM 850
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Single Pilot
Qualification	Flight Crew Private Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 26.2 Flight Crew Total 2702 Flight Crew Type 65
Events
Anomaly	Aircraft Equipment Problem Critical

A TBM850's pressurization control failed in cruise at 26;000 ft so an emergency was declared and an expedited descent begun but the pilot had VHF radio problems which seem to lessen at 14;000 ft and pressurization reset at at about 8;000 ft but the diverts to a nearby airport continued.