What was found
ON DEPARTURE OUT OF KBKL ENROUTE TO KDET, WHILE PASSING 10,000' MSL THERE WAS A LOUD, SUDDEN AND SINGLE AUDIBLE POPPING SOUND SIMULTANEOUSLY WITH THE SHATTERING OF THE LEFT COCKPIT WINDSCREEN. THE ASCENT WAS QUICKLY STOPPED AND A DESCENT AND AN IMMEDIATE DIVERT BACK TO KBKL WAS INITIATED. DESPITE THE SHATTERING THE VISIBILITY WAS STILL GOOD ENOUGH FOR THE CAPTAIN IN THE LEFT SEAT TO FLY THE APPROACH AND LANDING. THIS ACTION WAS TAKEN AS THE CO-PILOTS PROFICIENCY IN LANDING WAS VERY LOW AND THE AIRCRAFT WAS HEAVY WEIGHT WITH STRONG GUSTY WINDS AT THE AIRFIELD AND THERE WAS PASSENGERS ABOARD AT THE TIME. THE LANDING, TAXI BACK AND THE ENGINE SHUT DOWN WERE ALL UNEVENTFUL WITH NEVER A LOSS OF CABIN PRESSURE OR STRUCTURAL INTEGRITY OF THE WINDSCREEN.