C340 pilot encounters ice, and climbs aircraft for avoidance without ZMP clearance.

Attributes
ACN	577174
Time
Date	200303
Day	Fri
Local Time Of Day	1201 To 1800
Place
State Reference	MN
Altitude	msl single value : 8000
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp.artcc tower : lga.tower
Operator	general aviation : personal
Make Model Name	Cessna 340/340A
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude climbout : initial
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 1700 flight time type : 30
ASRS Report	577174
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter other non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment flight crew : took precautionary avoidance action flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I departed kjmr on an IFR flight plan with a filed altitude of 10000 ft, with reported tops of overcast at 5000 ft. I was cleared to 8000 ft. I started picking up moderate icing and used my deicing equipment several times through climb out prior to reaching 8000 ft. It wasn't keeping up. I could see open skies 500-700 ft above. I continued to climb, and asked ATC for 9000 ft. I needed out of the ice. I reacted to flying the aircraft prior to contacting ATC. I was concerned about my safety. I did immediately descend back to 8000 ft as requested until cleared to 9000 ft.

Original NASA ASRS Text

Title: C340 PLT ENCOUNTERS ICE, AND CLBS ACFT FOR AVOIDANCE WITHOUT ZMP CLRNC.

Narrative: I DEPARTED KJMR ON AN IFR FLT PLAN WITH A FILED ALT OF 10000 FT, WITH RPTED TOPS OF OVCST AT 5000 FT. I WAS CLRED TO 8000 FT. I STARTED PICKING UP MODERATE ICING AND USED MY DEICING EQUIP SEVERAL TIMES THROUGH CLBOUT PRIOR TO REACHING 8000 FT. IT WASN'T KEEPING UP. I COULD SEE OPEN SKIES 500-700 FT ABOVE. I CONTINUED TO CLB, AND ASKED ATC FOR 9000 FT. I NEEDED OUT OF THE ICE. I REACTED TO FLYING THE ACFT PRIOR TO CONTACTING ATC. I WAS CONCERNED ABOUT MY SAFETY. I DID IMMEDIATELY DSND BACK TO 8000 FT AS REQUESTED UNTIL CLRED TO 9000 FT.

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.