Atx cessna twin departing grb in IMC encounters ice, climbs to the clear without a clearance.

Attributes
ACN	266585
Time
Date	199403
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : grb
State Reference	WI
Altitude	msl bound lower : 12000 msl bound upper : 14000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Cessna Twin Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute airway : zmp
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 5000 flight time type : 40
ASRS Report	266585
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3100 flight time type : 30
ASRS Report	266580
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After takeoff from grb, grb approach handed us off to ZMP. ZMP cleared us to 8000 ft. We were on an IFR flight plan to thunder bay ontario. Upon reaching 8000 ft we were still IMC with icing conditions. We then asked for 10000 ft, then 12000 ft. At 12000 ft again we were still IMC with ice. At this time I asked controller for 14000 ft because the ice was building quickly. It was our belief that we had to climb to VMC conditions that were not far above us. The controller did not respond to our requests for 14000 ft. We did not believe it was a good idea to remain in ice therefore we broadcast to center's busy controller our intentions and we resumed the climb. At 12900 ft we broke out into VMC on top. At this point ATC noticed our altitude and we advised of the ice situation. We were then handed off to the next controller.

Original NASA ASRS Text

Title: ATX CESSNA TWIN DEPARTING GRB IN IMC ENCOUNTERS ICE, CLBS TO THE CLR WITHOUT A CLRNC.

Narrative: AFTER TKOF FROM GRB, GRB APCH HANDED US OFF TO ZMP. ZMP CLRED US TO 8000 FT. WE WERE ON AN IFR FLT PLAN TO THUNDER BAY ONTARIO. UPON REACHING 8000 FT WE WERE STILL IMC WITH ICING CONDITIONS. WE THEN ASKED FOR 10000 FT, THEN 12000 FT. AT 12000 FT AGAIN WE WERE STILL IMC WITH ICE. AT THIS TIME I ASKED CTLR FOR 14000 FT BECAUSE THE ICE WAS BUILDING QUICKLY. IT WAS OUR BELIEF THAT WE HAD TO CLB TO VMC CONDITIONS THAT WERE NOT FAR ABOVE US. THE CTLR DID NOT RESPOND TO OUR REQUESTS FOR 14000 FT. WE DID NOT BELIEVE IT WAS A GOOD IDEA TO REMAIN IN ICE THEREFORE WE BROADCAST TO CTR'S BUSY CTLR OUR INTENTIONS AND WE RESUMED THE CLB. AT 12900 FT WE BROKE OUT INTO VMC ON TOP. AT THIS POINT ATC NOTICED OUR ALT AND WE ADVISED OF THE ICE SIT. WE WERE THEN HANDED OFF TO THE NEXT CTLR.

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.