Small aircraft twin unable to comply with climb clearance on account of icing.

Attributes
ACN	234796
Time
Date	199302
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zla
State Reference	CA
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zla
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 20 flight time total : 900 flight time type : 200
ASRS Report	234796
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment other
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation other

Narrative:

I asked for climb when I picked up ice. Possibly should have asked for lower earlier, but ice had stopped accumulating at 11000 ft and didn't realize I couldn't continue climb until after 12000 ft. Plane went immediately to mechanic to fix transponder, check horsepwr output and see if any heater ducts clogged. Plane is only a few hours out of annual and otherwise operating perfectly. When I realized I could not climb further as requested, I notified ATC but we were both unreadable to each other. I went back to last known frequency, 118.9 bakersfield, which was loud and clear.

Original NASA ASRS Text

Title: SMA TWIN UNABLE TO COMPLY WITH CLB CLRNC ON ACCOUNT OF ICING.

Narrative: I ASKED FOR CLB WHEN I PICKED UP ICE. POSSIBLY SHOULD HAVE ASKED FOR LOWER EARLIER, BUT ICE HAD STOPPED ACCUMULATING AT 11000 FT AND DIDN'T REALIZE I COULDN'T CONTINUE CLB UNTIL AFTER 12000 FT. PLANE WENT IMMEDIATELY TO MECH TO FIX XPONDER, CHK HORSEPWR OUTPUT AND SEE IF ANY HEATER DUCTS CLOGGED. PLANE IS ONLY A FEW HRS OUT OF ANNUAL AND OTHERWISE OPERATING PERFECTLY. WHEN I REALIZED I COULD NOT CLB FURTHER AS REQUESTED, I NOTIFIED ATC BUT WE WERE BOTH UNREADABLE TO EACH OTHER. I WENT BACK TO LAST KNOWN FREQ, 118.9 BAKERSFIELD, WHICH WAS LOUD AND CLR.

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.