Flight crew lands hard, blows tires, and drifts off the runway into the mud. The reporter stated there was ice on the wings, the depth perception on the icy runway was like glassy water landing, the speed was allowed to deteriorate 8 KTS below the bug which would be about 13-18 KTS slow, and the sink rate was arrested with an abrupt flare.

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Attributes
ACN	327563
Time
Date	199601
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mmu
State Reference	NJ
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mmu
Operator	general aviation : personal
Make Model Name	IAI1124/1124A/Westwind
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp pilot : cfi
Experience	flight time last 90 days : 135 flight time total : 15550 flight time type : 400
ASRS Report	327563
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe inflight encounter other other anomaly other anomaly other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other
Situations
Airport	other physical facility procedure or policy : unspecified

Narrative:

We had just completed the NDB 5 approach in snow. The captain started the final descent about 1 mi from the runway threshold. Speed was on bug and rate was about 1000 FPM. At about 50 ft above the runway, speed was 8 KTS below bug when captain started to round out for flare. At this time, we felt aerodynamic buffet of impending stall with a rapid increase in vertical speed. Aircraft hit hard, bounced once, and finally settled down. Rollout appeared normal for about 1000 ft, at which time aircraft started to drift to the right side of the runway, finally exiting about 2500 ft from threshold into the mud, still parallel to runway, about 20 ft from the edge. No injuries (was crew only), found both main tires flat and buried in mud. Probable cause was 1/4 inch ice on surfaces (leading edge of tail and wings) and abrupt flare, plus landing environment was covered with snow, giving appearance similar to a glassy water landing in a seaplane.

Original NASA ASRS Text

Title: FLC LANDS HARD, BLOWS TIRES, AND DRIFTS OFF THE RWY INTO THE MUD. THE RPTR STATED THERE WAS ICE ON THE WINGS, THE DEPTH PERCEPTION ON THE ICY RWY WAS LIKE GLASSY WATER LNDG, THE SPD WAS ALLOWED TO DETERIORATE 8 KTS BELOW THE BUG WHICH WOULD BE ABOUT 13-18 KTS SLOW, AND THE SINK RATE WAS ARRESTED WITH AN ABRUPT FLARE.

Narrative: WE HAD JUST COMPLETED THE NDB 5 APCH IN SNOW. THE CAPT STARTED THE FINAL DSCNT ABOUT 1 MI FROM THE RWY THRESHOLD. SPD WAS ON BUG AND RATE WAS ABOUT 1000 FPM. AT ABOUT 50 FT ABOVE THE RWY, SPD WAS 8 KTS BELOW BUG WHEN CAPT STARTED TO ROUND OUT FOR FLARE. AT THIS TIME, WE FELT AERODYNAMIC BUFFET OF IMPENDING STALL WITH A RAPID INCREASE IN VERT SPD. ACFT HIT HARD, BOUNCED ONCE, AND FINALLY SETTLED DOWN. ROLLOUT APPEARED NORMAL FOR ABOUT 1000 FT, AT WHICH TIME ACFT STARTED TO DRIFT TO THE R SIDE OF THE RWY, FINALLY EXITING ABOUT 2500 FT FROM THRESHOLD INTO THE MUD, STILL PARALLEL TO RWY, ABOUT 20 FT FROM THE EDGE. NO INJURIES (WAS CREW ONLY), FOUND BOTH MAIN TIRES FLAT AND BURIED IN MUD. PROBABLE CAUSE WAS 1/4 INCH ICE ON SURFACES (LEADING EDGE OF TAIL AND WINGS) AND ABRUPT FLARE, PLUS LNDG ENVIRONMENT WAS COVERED WITH SNOW, GIVING APPEARANCE SIMILAR TO A GLASSY WATER LNDG IN A SEAPLANE.

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.