Pilot of small aircraft flew into turbulence and icing at 11000'. Turned toward mso without clearanc...

Attributes
ACN	119054
Time
Date	198908
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mso
State Reference	MT
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mso
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
ASRS Report	119054
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other spatial deviation
Independent Detector	other other : unspecified cockpit
Resolutory Action	flight crew : exited adverse environment
Consequence	Other Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I departed mso, having filed for 14000' which would have kept me on top of a scattered/broken layer. The departure controller kept me IMC at 11000', where I picked up 1/2' ice in moderate/severe turbulence. This caused altitude excursions beyond allowable limits. I asked for 14000', but it was denied due to an aircraft on approach. After picking up more ice, I turned toward the VOR/a final approach course, although I was not cleared to do so. Had I stayed in cloud much longer, it would have been necessary to declare an emergency.

Original NASA ASRS Text

Title: PLT OF SMA FLEW INTO TURBULENCE AND ICING AT 11000'. TURNED TOWARD MSO WITHOUT CLRNC.

Narrative: I DEPARTED MSO, HAVING FILED FOR 14000' WHICH WOULD HAVE KEPT ME ON TOP OF A SCATTERED/BROKEN LAYER. THE DEP CTLR KEPT ME IMC AT 11000', WHERE I PICKED UP 1/2' ICE IN MODERATE/SEVERE TURB. THIS CAUSED ALT EXCURSIONS BEYOND ALLOWABLE LIMITS. I ASKED FOR 14000', BUT IT WAS DENIED DUE TO AN ACFT ON APCH. AFTER PICKING UP MORE ICE, I TURNED TOWARD THE VOR/A FINAL APCH COURSE, ALTHOUGH I WAS NOT CLRED TO DO SO. HAD I STAYED IN CLOUD MUCH LONGER, IT WOULD HAVE BEEN NECESSARY TO DECLARE AN EMER.

Data retrieved from NASA's ASRS site as of August 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.

Pilot of small aircraft flew into turbulence and icing at 11000'. Turned toward mso without clearance.