Pilot experiences difficulty in maintaining altitude on approach to second alternate airport after icing encounter makes it difficult to maintain a stable altitude.

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Attributes
ACN	141296
Time
Date	199003
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mci
State Reference	MO
Altitude	msl bound lower : 2700 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mci
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach landing : missed approach landing other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 45 flight time total : 1178 flight time type : 278
ASRS Report	141296
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : exited adverse environment other other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on an IFR flight from ft smith, ar to sioux city, ia, via V13 at 8000 ft, encountered light precipitation between eos and bum, temperature 42 degree. After passing bum, the temperature started declining, checked with columbia flight watch and was informed tops were 16000 ft. Temperature continued to decline and I requested lower altitude. Center cleared me to 6000 ft. In descending, a light formation of clear ice formed 1/32 of an inch. Requested lower altitude and clearance for closest landing place. Cleared to 4000 ft and johnson county industrial, approximately 16 mi northwest. Shot the ILS 35 approach and saw runway lights immediately below, but too late for straight in landing. Attempted circle to land, lost sight of airport, declared missed approach and made a request for alternate airport, cleared direct kci, 3000 ft. Discovered trim tab frozen making altitude stabilization difficult while maintaining approach speed to avoid overshooting again. Altitude varied between 3000 ft and 2700 ft. Cleared for ILS 1 approach and landed.

Original NASA ASRS Text

Title: PLT EXPERIENCES DIFFICULTY IN MAINTAINING ALT ON APCH TO SECOND ALTERNATE ARPT AFTER ICING ENCOUNTER MAKES IT DIFFICULT TO MAINTAIN A STABLE ALT.

Narrative: WHILE ON AN IFR FLT FROM FT SMITH, AR TO SIOUX CITY, IA, VIA V13 AT 8000 FT, ENCOUNTERED LIGHT PRECIPITATION BETWEEN EOS AND BUM, TEMP 42 DEG. AFTER PASSING BUM, THE TEMP STARTED DECLINING, CHECKED WITH COLUMBIA FLT WATCH AND WAS INFORMED TOPS WERE 16000 FT. TEMP CONTINUED TO DECLINE AND I REQUESTED LOWER ALT. CTR CLRED ME TO 6000 FT. IN DESCENDING, A LIGHT FORMATION OF CLEAR ICE FORMED 1/32 OF AN INCH. REQUESTED LOWER ALT AND CLRNC FOR CLOSEST LNDG PLACE. CLRED TO 4000 FT AND JOHNSON COUNTY INDUSTRIAL, APPROX 16 MI NW. SHOT THE ILS 35 APCH AND SAW RWY LIGHTS IMMEDIATELY BELOW, BUT TOO LATE FOR STRAIGHT IN LNDG. ATTEMPTED CIRCLE TO LAND, LOST SIGHT OF ARPT, DECLARED MISSED APCH AND MADE A REQUEST FOR ALTERNATE ARPT, CLRED DIRECT KCI, 3000 FT. DISCOVERED TRIM TAB FROZEN MAKING ALT STABILIZATION DIFFICULT WHILE MAINTAINING APCH SPEED TO AVOID OVERSHOOTING AGAIN. ALT VARIED BETWEEN 3000 FT AND 2700 FT. CLRED FOR ILS 1 APCH AND LANDED.

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.