Small aircraft twin encounters thunderstorm while on IAP and performs series of WX avoidance changes in plan for destination airport during which makes multiple deviations in heading and altitude.

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Attributes
ACN	138864
Time
Date	199003
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ict airport : hut
State Reference	KS
Altitude	msl bound lower : 3800 msl bound upper : 4200
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : hut tracon : ict
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	cruise other descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : commercial
Experience	flight time last 90 days : 17 flight time total : 4000 flight time type : 250
ASRS Report	138864
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

IFR night flight from sln to hut. Thunderstorm 10 west of hut. Flight uneventful until nearing salt (outer marker) for ILS hut when entered east edge of thunderstorm. Asked hut approach for 120 heading to east to exit storm. They gave it to me. I was somewhat rattled at this point. I asked for clearance to ict and was given same. Ict approach cleared me to ict VOR expect ILS back course to 19L. At the ict VOR I changed my mind, asked for ILS back course R31 at hut and was given same, to fly ict radial 325 to intercept. Intercepted back course ILS, broke out under clouds, circled to land 17 at hut. I believe everything that occurred was legal. However, I was so rattled by the thunderstorm, night and cockpit intermittent (lights) malfunctions that I wrestled the plane all over the sky -- 200' altitude fluctuations on at least 3 occasions and 20-30 degree heading changes. The plane had no WX or storm scope equipment and no DME. These things might have given me peace of mind to do a better job. Need to practice IFR more and do it earlier in day.

Original NASA ASRS Text

Title: SMA TWIN ENCOUNTERS TSTM WHILE ON IAP AND PERFORMS SERIES OF WX AVOIDANCE CHANGES IN PLAN FOR DESTINATION ARPT DURING WHICH MAKES MULTIPLE DEVIATIONS IN HEADING AND ALT.

Narrative: IFR NIGHT FLT FROM SLN TO HUT. TSTM 10 W OF HUT. FLT UNEVENTFUL UNTIL NEARING SALT (OUTER MARKER) FOR ILS HUT WHEN ENTERED E EDGE OF TSTM. ASKED HUT APCH FOR 120 HDG TO E TO EXIT STORM. THEY GAVE IT TO ME. I WAS SOMEWHAT RATTLED AT THIS POINT. I ASKED FOR CLRNC TO ICT AND WAS GIVEN SAME. ICT APCH CLRED ME TO ICT VOR EXPECT ILS BACK COURSE TO 19L. AT THE ICT VOR I CHANGED MY MIND, ASKED FOR ILS BACK COURSE R31 AT HUT AND WAS GIVEN SAME, TO FLY ICT RADIAL 325 TO INTERCEPT. INTERCEPTED BACK COURSE ILS, BROKE OUT UNDER CLOUDS, CIRCLED TO LAND 17 AT HUT. I BELIEVE EVERYTHING THAT OCCURRED WAS LEGAL. HOWEVER, I WAS SO RATTLED BY THE TSTM, NIGHT AND COCKPIT INTERMITTENT (LIGHTS) MALFUNCTIONS THAT I WRESTLED THE PLANE ALL OVER THE SKY -- 200' ALT FLUCTUATIONS ON AT LEAST 3 OCCASIONS AND 20-30 DEG HDG CHANGES. THE PLANE HAD NO WX OR STORM SCOPE EQUIPMENT AND NO DME. THESE THINGS MIGHT HAVE GIVEN ME PEACE OF MIND TO DO A BETTER JOB. NEED TO PRACTICE IFR MORE AND DO IT EARLIER IN DAY.

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.