MU300 aircraft landing on icy runway ran off end of runway due to nil braking.

Attributes
ACN	390121
Time
Date	199712
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : leb
State Reference	NH
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	MU-300 Diamond 1/1A
Operating Under FAR Part	Part 135
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 1000 flight time type : 120
ASRS Report	390121
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	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	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were repositioning from bedford, ma, to lebanon, nh, part 91 to transport a stable patient to atlanta as part 135 air ambulance. The captain flew the full approach for the ILS runway 18 at leb. Onboard the aircraft were myself, the captain, and 3 medics (part of the crew). A normal landing was made. The ATIS reported braking conditions fair to poor due to ice and snow. The runway had been used by other aircraft that morning with no problem. Upon landing, the captain applied brakes and the aircraft decelerated well. Within the last 1000 ft of runway, we encountered solid clear ice and braking action became nil. At this point we were at a safe taxi speed, but could not slow enough to make the 90 degree turn off the runway. So we continued straight and proceeded about 30 ft beyond the runway onto a grass overrun (covered with about 4 inches of snow). All system were shut down. There was no damage to the aircraft and there were no injuries. The aircraft was then tugged back to the FBO. This event exemplifies the importance of assessing winter conditions and aircraft performance in those conditions and how it may affect the safety of the flight. It also shows the importance of having accurate braking condition reports when those conditions exist. It was good to hear that the airport plans to lengthen the runway when it gets warmer.

Original NASA ASRS Text

Title: MU300 ACFT LNDG ON ICY RWY RAN OFF END OF RWY DUE TO NIL BRAKING.

Narrative: WE WERE REPOSITIONING FROM BEDFORD, MA, TO LEBANON, NH, PART 91 TO TRANSPORT A STABLE PATIENT TO ATLANTA AS PART 135 AIR AMBULANCE. THE CAPT FLEW THE FULL APCH FOR THE ILS RWY 18 AT LEB. ONBOARD THE ACFT WERE MYSELF, THE CAPT, AND 3 MEDICS (PART OF THE CREW). A NORMAL LNDG WAS MADE. THE ATIS RPTED BRAKING CONDITIONS FAIR TO POOR DUE TO ICE AND SNOW. THE RWY HAD BEEN USED BY OTHER ACFT THAT MORNING WITH NO PROB. UPON LNDG, THE CAPT APPLIED BRAKES AND THE ACFT DECELERATED WELL. WITHIN THE LAST 1000 FT OF RWY, WE ENCOUNTERED SOLID CLR ICE AND BRAKING ACTION BECAME NIL. AT THIS POINT WE WERE AT A SAFE TAXI SPD, BUT COULD NOT SLOW ENOUGH TO MAKE THE 90 DEG TURN OFF THE RWY. SO WE CONTINUED STRAIGHT AND PROCEEDED ABOUT 30 FT BEYOND THE RWY ONTO A GRASS OVERRUN (COVERED WITH ABOUT 4 INCHES OF SNOW). ALL SYS WERE SHUT DOWN. THERE WAS NO DAMAGE TO THE ACFT AND THERE WERE NO INJURIES. THE ACFT WAS THEN TUGGED BACK TO THE FBO. THIS EVENT EXEMPLIFIES THE IMPORTANCE OF ASSESSING WINTER CONDITIONS AND ACFT PERFORMANCE IN THOSE CONDITIONS AND HOW IT MAY AFFECT THE SAFETY OF THE FLT. IT ALSO SHOWS THE IMPORTANCE OF HAVING ACCURATE BRAKING CONDITION RPTS WHEN THOSE CONDITIONS EXIST. IT WAS GOOD TO HEAR THAT THE ARPT PLANS TO LENGTHEN THE RWY WHEN IT GETS WARMER.

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.