GA small transport, forced to divert to an alternate by deteriorating enroute WX with ice, lost airc...

Attributes
ACN	172814
Time
Date	199103
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : grb
State Reference	WI
Altitude	msl bound lower : 0 msl bound upper : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : grb
Operator	general aviation : personal
Make Model Name	Small Transport
Flight Phase	landing other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 1200 flight time type : 4
ASRS Report	172814
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 100 flight time total : 820 flight time type : 80
ASRS Report	172815
Events
Anomaly	aircraft equipment problem : less severe inflight encounter : weather other anomaly other
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:

En route to mqt, aircraft encountered icing conditions and was unable to climb out of icing. At 10000' MSL it was 31 degrees F, so elected to descend to lower altitude, and as we descended temperature dropped to 28 degrees F. Accumulated large amount of ice on aircraft. Windshield became obstructed with ice. Decided to divert to nearest airport with precision approach. Was vectored to the ILS approach and runway environment was acquired. Aircraft owner took over landing phase. During flare-out with low left wing correcting for strong crosswind, aircraft experienced low level wind shear and dropped hard on left side, causing propeller strike. Unaware of strike till engines were shut down. No other damage caused. During WX briefing there were PIREPS stating smooth flying and no icing encountered at our en route altitude. Freezing level was forecasted to be above 8000'. Incoming cold front must have caused unexpected encounter. Contributing factors: de-ice bolts not working changed handling and flying characteristics of aircraft, especially at slower speed during landing and reduced forward visibility due to windshield icing.

Original NASA ASRS Text

Title: GA SMT, FORCED TO DIVERT TO AN ALTERNATE BY DETERIORATING ENROUTE WX WITH ICE, LOST ACFT CTL AND HIT PROPELLER ON LNDG IN GUSTY CROSSWIND.

Narrative: ENRTE TO MQT, ACFT ENCOUNTERED ICING CONDITIONS AND WAS UNABLE TO CLB OUT OF ICING. AT 10000' MSL IT WAS 31 DEGS F, SO ELECTED TO DSND TO LOWER ALT, AND AS WE DSNDED TEMP DROPPED TO 28 DEGS F. ACCUMULATED LARGE AMOUNT OF ICE ON ACFT. WINDSHIELD BECAME OBSTRUCTED WITH ICE. DECIDED TO DIVERT TO NEAREST ARPT WITH PRECISION APCH. WAS VECTORED TO THE ILS APCH AND RWY ENVIRONMENT WAS ACQUIRED. ACFT OWNER TOOK OVER LNDG PHASE. DURING FLARE-OUT WITH LOW LEFT WING CORRECTING FOR STRONG XWIND, ACFT EXPERIENCED LOW LEVEL WIND SHEAR AND DROPPED HARD ON LEFT SIDE, CAUSING PROP STRIKE. UNAWARE OF STRIKE TILL ENGS WERE SHUT DOWN. NO OTHER DAMAGE CAUSED. DURING WX BRIEFING THERE WERE PIREPS STATING SMOOTH FLYING AND NO ICING ENCOUNTERED AT OUR ENRTE ALT. FREEZING LEVEL WAS FORECASTED TO BE ABOVE 8000'. INCOMING COLD FRONT MUST HAVE CAUSED UNEXPECTED ENCOUNTER. CONTRIBUTING FACTORS: DE-ICE BOLTS NOT WORKING CHANGED HANDLING AND FLYING CHARACTERISTICS OF ACFT, ESPECIALLY AT SLOWER SPD DURING LNDG AND REDUCED FORWARD VISIBILITY DUE TO WINDSHIELD ICING.

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, forced to divert to an alternate by deteriorating enroute WX with ice, lost aircraft control and hit propeller on landing in gusty crosswind.