GA small transport altitude deviation excursion from clearance altitude in cloud buildup and turbule...

Attributes
ACN	179124
Time
Date	199105
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : lhs
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 10700
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zla tower : pit
Operator	general aviation : personal
Make Model Name	Small Transport
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi
Experience	flight time last 90 days : 43 flight time total : 1085 flight time type : 28
ASRS Report	179124
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

I was cleared to 10000' and later noticed on my altimeter that I was at 10700'. I descended the aircraft as rapidly as practical. In the climb the aircraft started to ice up and make abrupt attitude changes in severe turbulent conditions. The vertical speed indicator was reading approximately 1200-1500 FPM changes and the attitude indicator was showing 35-45 degree angle of bank. This caught me by surprise since icing was forecast at 12000' with light turbulence. This was my first time into WX like this and at nighttime. Also with only 203 hours of PIC in this type aircraft. I requested an altitude and heading change because of the icing. I should have reported severe turbulence. I have talked to several pilot friends and some accident prevention counselors about this occurrence and have learned this is common for the lake hughes VOR area. I have learned through discussing and reading how to deal with these conditions and avoid them. Also that I should take an experienced instrument with me in these kinds of conditions.

Original NASA ASRS Text

Title: GA SMT ALT DEVIATION EXCURSION FROM CLRNC ALT IN CLOUD BUILDUP AND TURBULENCE OVER MOUNTAINOUS AREA.

Narrative: I WAS CLRED TO 10000' AND LATER NOTICED ON MY ALTIMETER THAT I WAS AT 10700'. I DSNDED THE ACFT AS RAPIDLY AS PRACTICAL. IN THE CLB THE ACFT STARTED TO ICE UP AND MAKE ABRUPT ATTITUDE CHANGES IN SEVERE TURBULENT CONDITIONS. THE VERT SPD INDICATOR WAS READING APPROX 1200-1500 FPM CHANGES AND THE ATTITUDE INDICATOR WAS SHOWING 35-45 DEG ANGLE OF BANK. THIS CAUGHT ME BY SURPRISE SINCE ICING WAS FORECAST AT 12000' WITH LIGHT TURB. THIS WAS MY FIRST TIME INTO WX LIKE THIS AND AT NIGHTTIME. ALSO WITH ONLY 203 HRS OF PIC IN THIS TYPE ACFT. I REQUESTED AN ALT AND HDG CHANGE BECAUSE OF THE ICING. I SHOULD HAVE RPTED SEVERE TURB. I HAVE TALKED TO SEVERAL PLT FRIENDS AND SOME ACCIDENT PREVENTION COUNSELORS ABOUT THIS OCCURRENCE AND HAVE LEARNED THIS IS COMMON FOR THE LAKE HUGHES VOR AREA. I HAVE LEARNED THROUGH DISCUSSING AND READING HOW TO DEAL WITH THESE CONDITIONS AND AVOID THEM. ALSO THAT I SHOULD TAKE AN EXPERIENCED INSTR WITH ME IN THESE KINDS OF 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.

GA small transport altitude deviation excursion from clearance altitude in cloud buildup and turbulence over mountainous area.