GA CHARTER BOUNCED ON LNDG RWY 4. SLID OFF EDGE OF RWY RESULTING IN NOSEGEAR STRIKING SIGN AND BREAKING OFF THE ACFT. PROPS STRUCK THE GND AND THE ACFT CAME TO REST OFF THE EDGE OF THE RWY APPROX 2100 FT DOWN THE RWY. NO INJURIES TO PAX OR PLT. RWY HAD NOT BEEN PLOWED.

Narrative

ON JAN/XX/97; AT XA45 LCL; PORTLAND APCH CLRED ME FOR THE ILS RWY 4 TO LEW AND TO CHANGE FREQS. I CONTACTED CTAF WITH MY INTENTIONS/POS. AT 800 FT MSL I BROKE OUT OF THE OVCST AND SPOTTED THE RWY AND PROCEEDED VISUALLY. AT APPROX 1200 FT DOWN THE RWY; I TOUCHED DOWN FIRM ON THE MAIN GEAR AND BOUNCED ABOUT A FT. AFTER FIRMLY ON ALL 3 LNDG GEAR THE ACFT SLID TO THE L AND EXITED THE RWY. AT APPROX 2100 FT DOWN THE RWY; THE NOSEWHEEL STRUCK A RWY SIGN AND EXITED THE ACFT. THE AIRPLANE NOSED OVER WHEREUPON THE PROPS (AT IDLE) STRUCK THE GND. THE ACFT TRAVELED STRAIGHT ANOTHER 200 FT AND CAME TO REST AT ABOUT MID-FIELD AND 6 FT OFF THE EDGE OF THE RWY. I CHKED ALL PAX; SECURED THE AIRPLANE AND EXITED. CONTRIBUTING FACTORS: LOW LIGHT CONDITIONS; 2-3 INCHES OF UNPLOWED SNOW ON THE RWY AND ENTIRE ARPT -- DIFFICULT TO DETERMINE RWY. ONLY THE BOTTOM L SIDE OF THE ACFT'S WINDSHIELD WAS CLR FROM FREEZING DRIZZLE. CORRECTIVE ACTIONS: RECEIVING A BETTER RWY CONDITION RPT FROM FBO/MGR BEFORE STARTING THE APCH. DO NOT START APCH UNTIL AT LEAST ONE OF THE CONTRIBUTING FACTORS HAD BEEN CORRECTED; IE: 1) RWY PLOWED; 2) FREEZING DRIZZLE DISSIPATED; AND 3) BETTER RECOGNITION OF RWY LIGHTS.