<< >> NASA ASRS Report 199378, January 1992

Altitude deviation altitude excursion occurs with small transport during an in-flight encounter with severe icing conditions.

Attributes
ACN	199378
Time
Date	199201
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cgi
State Reference	MO
Altitude	msl bound lower : 2000 msl bound upper : 4000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 190 flight time total : 1500 flight time type : 130
ASRS Report	199378
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter other non adherence : clearance other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

I am filing this report since I deviated from assigned altitude due to icing (severe). I was flying at 4000 ft just above the clouds when I entered a cloud and before I could get the propeller heat to work we accumulated a great deal of ice which caused me to descend. Once I came out of the clouds the aircraft was under control. I went ahead and landed to check out the aircraft and everything was ok. Flight watch was only calling for light to moderate ice. There was another aircraft in area that verified ice conditions.

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Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION OCCURS WITH SMT DURING AN INFLT ENCOUNTER WITH SEVERE ICING CONDITIONS.

Narrative: I AM FILING THIS RPT SINCE I DEVIATED FROM ASSIGNED ALT DUE TO ICING (SEVERE). I WAS FLYING AT 4000 FT JUST ABOVE THE CLOUDS WHEN I ENTERED A CLOUD AND BEFORE I COULD GET THE PROP HEAT TO WORK WE ACCUMULATED A GREAT DEAL OF ICE WHICH CAUSED ME TO DSND. ONCE I CAME OUT OF THE CLOUDS THE ACFT WAS UNDER CTL. I WENT AHEAD AND LANDED TO CHK OUT THE ACFT AND EVERYTHING WAS OK. FLT WATCH WAS ONLY CALLING FOR LIGHT TO MODERATE ICE. THERE WAS ANOTHER ACFT IN AREA THAT VERIFIED ICE CONDITIONS.

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.